Today's Message Index:
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1. 12:56 AM - Re: Engine roughness, as in stops. starts. stops. starts. (Richard Goode)
2. 05:41 AM - Re: Engine roughness, as in stops. starts. stops. starts. (JL2A)
3. 06:44 AM - Re: Engine roughness, as in stops. starts. stops. starts. (migfighter42)
4. 06:55 AM - Re: Engine roughness, as in stops. starts. stops. starts. (Ernest Martinez)
5. 07:15 AM - Re: Engine roughness, as in stops. starts. stops. starts. (Richard Goode)
6. 07:59 AM - Re: Re: Engine roughness, as in stops. starts. stops. starts. (Bitterlich, Mark G CIV NAVAIR, WD)
7. 08:17 AM - Re: Engine roughness, as in stops. starts. stops. starts. (A. Dennis Savarese)
8. 08:49 AM - =?utf-8?Q?Re:__Re:_Engine_roughness,_as_in_stops._starts._stops.?= =?utf-8?Q?__starts.? ()
9. 08:56 AM - Re: Re: Engine roughness, as in stops. starts. stops. starts. (cjpilot710@aol.com)
10. 09:12 AM - Re: Re: Engine roughness, as in stops. starts. stops. starts. (cjpilot710@aol.com)
11. 09:16 AM - Re: Engine roughness, as in stops. starts. stops. starts. (Ernest Martinez)
12. 11:58 AM - Re: Re: Engine roughness, as in stops. starts. stops. starts. (Roger Kemp)
13. 12:25 PM - Re: Engine roughness, as in stops. starts. stops. starts. (Roger Kemp)
14. 12:39 PM - Re: Engine roughness, as in stops. starts. stops. starts. (Dan Payne)
15. 01:21 PM - Re: Engine roughness, as in stops. starts. stops. starts. (Richard Hess)
16. 01:27 PM - Re: Engine roughness, as in stops. starts. stops. starts. (doug sapp)
17. 04:51 PM - Re: Engine roughness, as in stops. starts. stops. starts. (Roger Kemp)
18. 05:00 PM - Re: Engine roughness, as in stops. starts. stops. starts. (Roger Kemp)
19. 05:17 PM - Re: Engine roughness, as in stops. starts. stops. starts. (Richard Hess)
Message 1
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| Subject: | Engine roughness, as in stops. starts. stops. starts. |
Without any doubt the problem will be a magneto coil - we have experienced
this on at least 30 aircraft over the last 25 years! The important point is
that it is related to engine temperature, so only becomes apparent after
15/25 minutes of flight. If you then land and allow the engine to cool, the
problem will disappear. But, it will get steadily worse.
One aspect that I have never understood is that the engine will cut
completely, usually only for a second or so but still very alarming, and it
does not seem to run on the other magneto for that brief period!
This is why, when we overhaul magnetos we then test them in a
high-temperature box (well in excess of operating temperatures) for an hour
to make sure that this problem will not happen.
Richard Goode Aerobatics
Rhodds Farm
Lyonshall
Hereford
HR5 3LW
Tel: +44 (0) 1544 340120
Fax: +44 (0) 1544 340129
www.russianaeros.com
-----Original Message-----
From: owner-yak-list-server@matronics.com
[mailto:owner-yak-list-server@matronics.com] On Behalf Of JL2A
Sent: 29 May 2015 00:56
Subject: Yak-List: Engine roughness, as in stops. starts. stops. starts.
Hi all, my formation partner had a bit of engine trouble last time we flew
then I took the same plane up for a shake down and got the same result -
cruise power, 10 minutes into the flight, engine cuts abruptly, goes, cuts
again, goes. Mixture full rich, carb heat on, didn't do it again but then
these items were actioned after running fine for a few seconds.
The cuts were hard, as in no power not just roughness, and only for a split
second, but enough to get your attention.
Speaking to two local CJ/Yak experts and they say it is likely the
'mid-range' mixture adjustment (I think the CJ book calls it 'cruise'
mixture, same thing).
Has anyone here experienced the same? Would be curious as to what an earth
is going on, intermittent failures are the worst!
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=442717#442717
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Message 2
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| Subject: | Re: Engine roughness, as in stops. starts. stops. starts. |
Hi all, thanks for the on and off list replies. Very greatly appreciated believe
me, the owner has delivered the aircraft to the mechanics and they were starting
with their belief it is the mixture setting.
He has been informed and will be starting with new magneto coils instead now though!
I had a points spring break on one mag once, so it killed the mag completely and
I do remember an attention-grabbing splutter and then the engine continued sounding
more or less normal (was at low power on base). Strange how one mag dropping
off seems to momentarily affect the other...
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=442739#442739
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| Subject: | Re: Engine roughness, as in stops. starts. stops. starts. |
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| Subject: | Re: Engine roughness, as in stops. starts. stops. starts. |
Quick question.
Wouldn't a coil problem only manifest itself on 1 side? A complete loss of
1 Mag shouldn't cause an abrupt and complete loss of power should it?
Ernie
On Fri, May 29, 2015 at 9:43 AM, migfighter42 <migfighter42@gmail.com>
wrote:
> If its the fuel pump, you should see it on the fuel pressure gauge.
>
> if it is the valve train, that should be a problem noticed at all times,
a
> loss of perforce irrespective of time and temperature.
>
> If it is always happening after a certain period of time in flight
> everytime, its coil related. We had this exact problem a year ago, took u
s
> forever to find it. Dennis and Jill finally got us on the right path.
>
> Good luck.
>
> Bill
>
>
> Sent from my T-Mobile 4G LTE Device
> -------- Original message --------
> From: Dan Payne <dantpayne@icloud.com>
> Date: 05/29/2015 12:28 AM (GMT-06:00)
> To: yak-list@matronics.com
> Subject: Re: Yak-List: Engine roughness, as in stops. starts. stops.
> starts.
>
> However..."engine cuts abruptly, goes, cuts again, goes. Mixture full
> rich, carb heat on, didn't do it again but then these items were actioned
> after running fine for a few seconds."
>
> If you went full rich, then turned on the carb heat (making the mixture
> even more rich) that's answers you own dilemma / question.
>
> Change the fuel pump
>
> Keep 'em Flyin',
>
> Dan Payne
> Owner, Pilot, A&P-IA
> (423)-544-8946
>
> Volunteer Aero Service
> Dallas Bay Skypark
> 1824 E Crabtree Road
> Hixson, TN 37343
>
> "Where Airworthiness Means Business!"
>
>
> On May 29, 2015, at 1:19 AM, Dan Payne <dantpayne@icloud.com> wrote:
>
> Ps....if you throw fuel to it mid-flight and it burst back to life...I
> would suspect a worn out engine driven pump...
>
> Keep 'em Flyin',
>
> Dan Payne
> Owner, Pilot, A&P-IA
> (423)-544-8946
>
> Volunteer Aero
> Dallas Bay Skypark
> 1824 E Crabtree Road
> Hixson, TN 37343
>
> "Where Airworthiness Means Business!"
>
>
> On May 29, 2015, at 1:01 AM, Bill Geipel <l129bs@gmail.com> wrote:
>
> Adjust my what?? v-a-l-v-e-s? Like consonants?
>
> You do many annuals? You must be =9Crich"
>
> I=99m not =9Crich=9D, no nothing about radials, why sho
uld I, we have guys like
> you that are willing to do it while we lounge by the pool, fly, camp, hik
e,
> bike, fly some more etc.
> So everyone gets what they want.
> I see your company name says =9CVolunteer=9D well, don
=99t. Problem for you,
> solved.
> Shot mine, NOT bullet proof.
>
> Keep smiling.
>
> Bill Geipel
> Owner, pilot, not A&P-IA
> can=99t afford cell phone.
>
>
> On May 29, 2015, at 1:00 PM, Dan Payne <dantpayne@icloud.com> wrote:
>
> P.S.:
>
> Why don't you all adjust your valves??
>
> I do many annuals on "rich" people's airplanes who know nothing about
> Radials....
>
> The engines are reliable. The airframes are bullet proof, and Denis
> Savarese is your go to guy on 4th & 10!
>
> Keep 'em Flyin',
>
> Dan Payne
> Owner, Pilot, A&P-IA
> (423)-544-8946
>
> Volunteer Aero Services
> Dallas Bay Skypark
> 1824 E Crabtree Road
> Hixson, TN 37343
>
> "Where Airworthiness Means Business!"
>
>
> On May 28, 2015, at 11:46 PM, Dan Payne <dantpayne@icloud.com> wrote:
>
> Adjust the points/ breaker felts on the mags...
>
>
> Let not forget the dwell timing / distributor advance in our GTOs we drov
e
> to high school...
>
> Keep 'em Flyin',
>
> Dan Payne
> Owner, Pilot, A&P-IA
> (423)-544-8946
>
> Volunteer Aero Service
> Dallas Bay Skypark
> 1824 E Crabtree Road
> Hixson, TN 37343
>
> "Where Airworthiness Means Business!"
>
>
> On May 28, 2015, at 11:03 PM, migfighter42 <migfighter42@gmail.com> wrote
:
>
> my experience with that problem is the same as Doc mentioned. the aircraf
t
> would run fine until warmed up, normally in flight, then dramatic misses.
> replaced the coils in the magnetos, the problem went away.
>
> Bill
>
>
> Sent from my T-Mobile 4G LTE Device
> -------- Original message --------
> From: Roger Kemp <f16viperdoc@me.com>
> Date: 05/28/2015 8:47 PM (GMT-06:00)
> To: yak-list@matronics.com
> Subject: Re: Yak-List: Engine roughness, as in stops. starts. stops.
> starts.
>
>
> Mag coil going bad will also do that. Typically occurs about 10 to 15
> minutes of the flight.
> Doc
>
> Sent from my iPad
>
> > On May 28, 2015, at 6:55 PM, JL2A <info@flyingwarbirds.com.au> wrote:
> >
> >
> > Hi all, my formation partner had a bit of engine trouble last time we
> flew then I took the same plane up for a shake down and got the same resu
lt
> -
> >
> > cruise power, 10 minutes into the flight, engine cuts abruptly, goes,
> cuts again, goes. Mixture full rich, carb heat on, didn't do it again but
> then these items were actioned after running fine for a few seconds.
> >
> > The cuts were hard, as in no power not just roughness, and only for a
> split second, but enough to get your attention.
> >
> > Speaking to two local CJ/Yak experts and they say it is likely the
> 'mid-range' mixture adjustment (I think the CJ book calls it 'cruise'
> mixture, same thing).
> >
> > Has anyone here experienced the same? Would be curious as to what an
> earth is going on, intermittent failures are the worst!
> >
> >
> >
> >
> > Read this topic online here:
> >
> > http://forums.matronics.com/viewtopic.php?p=442717#442717
> >
> >
> >
> > http://www.matronics.com/Navig=============
=============p;
> -========================
===nbsp; -Matt Dralle, List
> Admin.<======================
===
>
>
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| Subject: | Engine roughness, as in stops. starts. stops. starts. |
That is what one would assume, and I have no explanation for the fact
that the coil beginning to break down in one magneto will cause rough
running and indeed stopping, but it definitely does!
Richard Goode Aerobatics
Rhodds Farm
Lyonshall
Hereford
HR5 3LW
Tel: +44 (0) 1544 340120
Fax: +44 (0) 1544 340129
www.russianaeros.com
From: owner-yak-list-server@matronics.com
[mailto:owner-yak-list-server@matronics.com] On Behalf Of Ernest
Martinez
Sent: 29 May 2015 14:55
Subject: Re: Yak-List: Engine roughness, as in stops. starts. stops.
starts.
Quick question.
Wouldn't a coil problem only manifest itself on 1 side? A complete loss
of 1 Mag shouldn't cause an abrupt and complete loss of power should it?
Ernie
On Fri, May 29, 2015 at 9:43 AM, migfighter42 <migfighter42@gmail.com>
wrote:
If its the fuel pump, you should see it on the fuel pressure gauge.
if it is the valve train, that should be a problem noticed at all times,
a loss of perforce irrespective of time and temperature.
If it is always happening after a certain period of time in flight
everytime, its coil related. We had this exact problem a year ago, took
us forever to find it. Dennis and Jill finally got us on the right path.
Good luck.
Bill
Sent from my T-Mobile 4G LTE Device
-------- Original message --------
From: Dan Payne <dantpayne@icloud.com>
Subject: Re: Yak-List: Engine roughness, as in stops. starts. stops.
starts.
However..."engine cuts abruptly, goes, cuts again, goes. Mixture full
rich, carb heat on, didn't do it again but then these items were
actioned after running fine for a few seconds."
If you went full rich, then turned on the carb heat (making the mixture
even more rich) that's answers you own dilemma / question.
Change the fuel pump
Keep 'em Flyin',
Dan Payne
Owner, Pilot, A&P-IA
(423)-544-8946 <tel:%28423%29-544-8946>
Volunteer Aero Service
Dallas Bay Skypark
1824 E Crabtree Road
Hixson, TN 37343
"Where Airworthiness Means Business!"
On May 29, 2015, at 1:19 AM, Dan Payne <dantpayne@icloud.com> wrote:
Ps....if you throw fuel to it mid-flight and it burst back to life...I
would suspect a worn out engine driven pump...
Keep 'em Flyin',
Dan Payne
Owner, Pilot, A&P-IA
(423)-544-8946 <tel:%28423%29-544-8946>
Volunteer Aero
Dallas Bay Skypark
1824 E Crabtree Road
Hixson, TN 37343
"Where Airworthiness Means Business!"
On May 29, 2015, at 1:01 AM, Bill Geipel <l129bs@gmail.com> wrote:
Adjust my what?? v-a-l-v-e-s? Like consonants?
You do many annuals? You must be =9Crich"
I=99m not =9Crich=9D, no nothing about radials, why
should I, we have guys like you that are willing to do it while we
lounge by the pool, fly, camp, hike, bike, fly some more etc.
So everyone gets what they want.
I see your company name says =9CVolunteer=9D well,
don=99t. Problem for you, solved.
Shot mine, NOT bullet proof.
Keep smiling.
Bill Geipel
Owner, pilot, not A&P-IA
can=99t afford cell phone.
On May 29, 2015, at 1:00 PM, Dan Payne <dantpayne@icloud.com> wrote:
P.S.:
Why don't you all adjust your valves??
I do many annuals on "rich" people's airplanes who know nothing about
Radials....
The engines are reliable. The airframes are bullet proof, and Denis
Savarese is your go to guy on 4th & 10!
Keep 'em Flyin',
Dan Payne
Owner, Pilot, A&P-IA
(423)-544-8946 <tel:%28423%29-544-8946>
Volunteer Aero Services
Dallas Bay Skypark
1824 E Crabtree Road
Hixson, TN 37343
"Where Airworthiness Means Business!"
On May 28, 2015, at 11:46 PM, Dan Payne <dantpayne@icloud.com> wrote:
Adjust the points/ breaker felts on the mags...
Let not forget the dwell timing / distributor advance in our GTOs we
drove to high school...
Keep 'em Flyin',
Dan Payne
Owner, Pilot, A&P-IA
(423)-544-8946 <tel:%28423%29-544-8946>
Volunteer Aero Service
Dallas Bay Skypark
1824 E Crabtree Road
Hixson, TN 37343
"Where Airworthiness Means Business!"
On May 28, 2015, at 11:03 PM, migfighter42 <migfighter42@gmail.com>
wrote:
my experience with that problem is the same as Doc mentioned. the
aircraft would run fine until warmed up, normally in flight, then
dramatic misses. replaced the coils in the magnetos, the problem went
away.
Bill
Sent from my T-Mobile 4G LTE Device
-------- Original message --------
From: Roger Kemp <f16viperdoc@me.com>
Subject: Re: Yak-List: Engine roughness, as in stops. starts. stops.
starts.
Mag coil going bad will also do that. Typically occurs about 10 to 15
minutes of the flight.
Doc
Sent from my iPad
> On May 28, 2015, at 6:55 PM, JL2A <info@flyingwarbirds.com.au> wrote:
>
>
> Hi all, my formation partner had a bit of engine trouble last time we
flew then I took the same plane up for a shake down and got the same
result -
>
> cruise power, 10 minutes into the flight, engine cuts abruptly, goes,
cuts again, goes. Mixture full rich, carb heat on, didn't do it again
but then these items were actioned after running fine for a few seconds.
>
> The cuts were hard, as in no power not just roughness, and only for a
split second, but enough to get your attention.
>
> Speaking to two local CJ/Yak experts and they say it is likely the
'mid-range' mixture adjustment (I think the CJ book calls it 'cruise'
mixture, same thing).
>
> Has anyone here experienced the same? Would be curious as to what an
earth is going on, intermittent failures are the worst!
>
>
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=442717#442717
>
>
>
>
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| Subject: | Re: Engine roughness, as in stops. starts. stops. starts. |
Might as well add my 2 cents. First of all, I totally concur with Richard Goode,
not only because he has been around these aircraft longer than most anyone
else on this list, but also because I have experienced the exact same symptoms
troubleshooting a YAK-52 just a few months ago.
Very likely NOT the carb. And this is not meant as sarcasm, but after some "mechs"
mess around with it for a while it might very well end up being that as
well. Very few people know how to adjust these pressure carbs properly and there
is much more to it than turning the "screw" on the outside. Of course there
is nothing like "doing" to help in learning, as long as it is on your aircraft
and not mine please. What I am saying here is that messing around with the
carb should be LAST on anyone's list and never first. Also it is the nature
of pressure carbs that if you adjust one thing, it impacts another. Just had
a Bendix PS-7BD rebuilt and flowed ($3000 by the way) and while not Russian,
the theory is the same and worth reading about.
There is a very simple test to run here. Go up and fly it one more time and just
simply fly it until it starts doing this again, and then switch off one mag
and then the other to see if it then STOPS doing it or gets much worse on one.
It is very unusual for both mags to have something go bad with them at the
same time (thankfully). STRONGLY recommend this before applying fingers or
tools to the carb.
The problem with the coils is legendary. If you own one of these aircraft it is
not a matter of "if" you will have a coil go bad, but when. Other things can
cause the coil to over-heat faster and these range from wide gaps on spark
plugs, to misadjusted points "or dwell" as mentioned. Also, I have seen the point
assembly actually crack leading to erratic ignition (you mentioned that one
yourself). Points will not usually come out of adjustment through normal use
enough to cause what you are experiencing, but if they are cracked and flexing
they can cause these exact symptoms too.
I have had two personal experiences with mag issues on my own aircraft. In one
case, the internal gearing in the mag (M9F) let go, and the engine just STOPPED.
Ernie (in another message) mentioned that this should not happen should
it? Well, that is what we are all taught, but as it turns out it is not necessarily
accurate. I did not time how many seconds it just STOPPED, but it was
enough time for me to think: "Oh crap, I am going to have to land this thing
on the freaking OUTER BANKS! Should I go in gear up or down?". And then it
came back running rougher than blazes. I tried the mag switch, and it ran on
one mag perfectly and on the other it just stopped. So why did that happen?
It should not have. But it did. Lots of "might be maybe" theory, but honestly
I do not know.
Second time was a mag coil. Pretty much exactly what you are talking about here.
Again, simply switching between mags in flight isolated the problem very
quickly. Why did it impact engine performance on both? Well, all I can think
of is a spark plug firing way in advance. In my mind, only three things can
happen with ignition. It doesn't work at all, it fires early, or it fires late.
Not working at all would not make the engine cough and gag, UNLESS you had
a problem with the OTHER ignition set that you didn't know about (bad plug,
etc.) If it fired late, it would not matter at all. But if it fired early...
way early, as the piston was coming up on the compression stroke ..... some
weird stuff would happen, bad detonation and engine coughing and puking being
one. So that is my "theory".
If this test is performed in flight and it does it again on EITHER MAG, then the
next step is a compression test. But really, you need to fly it one more time.
Mark
-----Original Message-----
From: owner-yak-list-server@matronics.com [mailto:owner-yak-list-server@matronics.com] On Behalf Of JL2A
Sent: Friday, May 29, 2015 8:41 AM
Subject: Yak-List: Re: Engine roughness, as in stops. starts. stops. starts.
Hi all, thanks for the on and off list replies. Very greatly appreciated believe
me, the owner has delivered the aircraft to the mechanics and they were starting
with their belief it is the mixture setting.
He has been informed and will be starting with new magneto coils instead now though!
I had a points spring break on one mag once, so it killed the mag completely and
I do remember an attention-grabbing splutter and then the engine continued sounding
more or less normal (was at low power on base). Strange how one mag dropping
off seems to momentarily affect the other...
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=442739#442739
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| Subject: | Re: Engine roughness, as in stops. starts. stops. starts. |
Yes, it does Ernie. If you've never experienced a coil failure in one
mag, I can tell you it WILL get your attention because if feels like the
engine completely shuts down for one heartbeat, then picks back up again.
I was told by someone with a lot more life experiences than me that
another older radial (can't remember if it was one of the small
Continental's like was used on the Stearmanor Wright or Pratt)the
engineers determined when the coil failed like being discussed here, the
fuel charge through the supercharger (ie: fuel distribution point) is
completely purged for one heartbeat causing the sensation of a complete
shutdown for a few millisecondsand then recharged and the engine picks
back up. It's really weird. But I can tell you from many experiences,
that's what it feels like. Maybe someone onthe list can better define
why it feels like a complete shutdown for a heartbeat.
FWIW, I have been able to duplicate the problem on the ground by heating
up the engine to above about 250 degrees C as read on the CHT. As
Richard Goode has stated, it definitely is a heat problem with the coil
which typically occurs in the first 20-30 minutes of the flight.
Repeating it on the ground is more difficult. But it can be done. If you
can get the coil hot enoughon the ground, the engine will start to
misfire. Once THAT occurs, you can isolate the problem to the left or
right mag with the mag switch.
A. Dennis Savarese
334-546-8182 (mobile)
www.yak-52.com
Skype - Yakguy1
On 5/29/2015 8:54 AM, Ernest Martinez wrote:
> Quick question.
>
> Wouldn't a coil problem only manifest itself on 1 side? A complete
> loss of 1 Mag shouldn't cause an abrupt and complete loss of power
> should it?
>
> Ernie
>
> On Fri, May 29, 2015 at 9:43 AM, migfighter42 <migfighter42@gmail.com
> <mailto:migfighter42@gmail.com>> wrote:
>
> If its the fuel pump, you should see it on the fuel pressure gauge.
>
> if it is the valve train, that should be a problem noticed at all
> times, a loss of perforce irrespective of time and temperature.
>
> If it is always happening after a certain period of time in flight
> everytime, its coil related. We had this exact problem a year ago,
> took us forever to find it. Dennis and Jill finally got us on the
> right path.
>
> Good luck.
>
> Bill
>
>
> Sent from my T-Mobile 4G LTE Device
> -------- Original message --------
> From: Dan Payne <dantpayne@icloud.com <mailto:dantpayne@icloud.com>>
> Date: 05/29/2015 12:28 AM (GMT-06:00)
> To: yak-list@matronics.com <mailto:yak-list@matronics.com>
> Subject: Re: Yak-List: Engine roughness, as in stops. starts.
> stops. starts.
>
> However..."engine cuts abruptly, goes, cuts again, goes. Mixture
> full rich, carb heat on, didn't do it again but then these items
> were actioned after running fine for a few seconds."
>
> If you went full rich, then turned on the carb heat (making the
> mixture even more rich) that's answers you own dilemma / question.
>
> Change the fuel pump
>
> Keep 'em Flyin',
>
> Dan Payne
> Owner, Pilot, A&P-IA
> (423)-544-8946 <tel:%28423%29-544-8946>
>
> Volunteer Aero Service
> Dallas Bay Skypark
> 1824 E Crabtree Road
> Hixson, TN 37343
>
> "Where Airworthiness Means Business!"
>
>
> On May 29, 2015, at 1:19 AM, Dan Payne <dantpayne@icloud.com
> <mailto:dantpayne@icloud.com>> wrote:
>
>> Ps....if you throw fuel to it mid-flight and it burst back to
>> life...I would suspect a worn out engine driven pump...
>>
>> Keep 'em Flyin',
>>
>> Dan Payne
>> Owner, Pilot, A&P-IA
>> (423)-544-8946 <tel:%28423%29-544-8946>
>>
>> Volunteer Aero
>> Dallas Bay Skypark
>> 1824 E Crabtree Road
>> Hixson, TN 37343
>>
>> "Where Airworthiness Means Business!"
>>
>>
>> On May 29, 2015, at 1:01 AM, Bill Geipel <l129bs@gmail.com
>> <mailto:l129bs@gmail.com>> wrote:
>>
>>> Adjust my what?? v-a-l-v-e-s? Like consonants?
>>>
>>> You do many annuals? You must be rich"
>>>
>>> Im not rich, no nothing about radials, why should I, we have
>>> guys like you that are willing to do it while we lounge by the
>>> pool, fly, camp, hike, bike, fly some more etc.
>>> So everyone gets what they want.
>>> I see your company name says Volunteer well, dont. Problem
>>> for you, solved.
>>> Shot mine, NOT bullet proof.
>>>
>>> Keep smiling.
>>>
>>> Bill Geipel
>>> Owner, pilot, not A&P-IA
>>> cant afford cell phone.
>>>
>>>
>>> On May 29, 2015, at 1:00 PM, Dan Payne <dantpayne@icloud.com
>>> <mailto:dantpayne@icloud.com>> wrote:
>>>
>>>> P.S.:
>>>>
>>>> Why don't you all adjust your valves??
>>>>
>>>> I do many annuals on "rich" people's airplanes who know nothing
>>>> about Radials....
>>>>
>>>> The engines are reliable. The airframes are bullet proof, and
>>>> Denis Savarese is your go to guy on 4th & 10!
>>>>
>>>> Keep 'em Flyin',
>>>>
>>>> Dan Payne
>>>> Owner, Pilot, A&P-IA
>>>> (423)-544-8946 <tel:%28423%29-544-8946>
>>>>
>>>> Volunteer Aero Services
>>>> Dallas Bay Skypark
>>>> 1824 E Crabtree Road
>>>> Hixson, TN 37343
>>>>
>>>> "Where Airworthiness Means Business!"
>>>>
>>>>
>>>> On May 28, 2015, at 11:46 PM, Dan Payne <dantpayne@icloud.com
>>>> <mailto:dantpayne@icloud.com>> wrote:
>>>>
>>>>> Adjust the points/ breaker felts on the mags...
>>>>>
>>>>>
>>>>> Let not forget the dwell timing / distributor advance in our
>>>>> GTOs we drove to high school...
>>>>>
>>>>> Keep 'em Flyin',
>>>>>
>>>>> Dan Payne
>>>>> Owner, Pilot, A&P-IA
>>>>> (423)-544-8946 <tel:%28423%29-544-8946>
>>>>>
>>>>> Volunteer Aero Service
>>>>> Dallas Bay Skypark
>>>>> 1824 E Crabtree Road
>>>>> Hixson, TN 37343
>>>>>
>>>>> "Where Airworthiness Means Business!"
>>>>>
>>>>>
>>>>> On May 28, 2015, at 11:03 PM, migfighter42
>>>>> <migfighter42@gmail.com <mailto:migfighter42@gmail.com>> wrote:
>>>>>
>>>>>> my experience with that problem is the same as Doc mentioned.
>>>>>> the aircraft would run fine until warmed up, normally in
>>>>>> flight, then dramatic misses. replaced the coils in the
>>>>>> magnetos, the problem went away.
>>>>>>
>>>>>> Bill
>>>>>>
>>>>>>
>>>>>>
>>>>>> Sent from my T-Mobile 4G LTE Device
>>>>>> -------- Original message --------
>>>>>> From: Roger Kemp <f16viperdoc@me.com
>>>>>> <mailto:f16viperdoc@me.com>>
>>>>>> Date: 05/28/2015 8:47 PM (GMT-06:00)
>>>>>> To: yak-list@matronics.com <mailto:yak-list@matronics.com>
>>>>>> Subject: Re: Yak-List: Engine roughness, as in stops. starts.
>>>>>> stops. starts.
>>>>>>
>>>>>> <f16viperdoc@me.com <mailto:f16viperdoc@me.com>>
>>>>>>
>>>>>> Mag coil going bad will also do that. Typically occurs about
>>>>>> 10 to 15 minutes of the flight.
>>>>>> Doc
>>>>>>
>>>>>> Sent from my iPad
>>>>>>
>>>>>> > On May 28, 2015, at 6:55 PM, JL2A
>>>>>> <info@flyingwarbirds.com.au
>>>>>> <mailto:info@flyingwarbirds.com.au>> wrote:
>>>>>> >
>>>>>> <info@flyingwarbirds.com.au <mailto:info@flyingwarbirds.com.au>>
>>>>>> >
>>>>>> > Hi all, my formation partner had a bit of engine trouble
>>>>>> last time we flew then I took the same plane up for a shake
>>>>>> down and got the same result -
>>>>>> >
>>>>>> > cruise power, 10 minutes into the flight, engine cuts
>>>>>> abruptly, goes, cuts again, goes. Mixture full rich, carb
>>>>>> heat on, didn't do it again but then these items were
>>>>>> actioned after running fine for a few seconds.
>>>>>> >
>>>>>> > The cuts were hard, as in no power not just roughness, and
>>>>>> only for a split second, but enough to get your attention.
>>>>>> >
>>>>>> > Speaking to two local CJ/Yak experts and they say it is
>>>>>> likely the 'mid-range' mixture adjustment (I think the CJ
>>>>>> book calls it 'cruise' mixture, same thing).
>>>>>> >
>>>>>> > Has anyone here experienced the same? Would be curious as
>>>>>> to what an earth is going on, intermittent failures are the
>>>>>> worst!
>>>>>> >
>>>>>> >
>>>>>> >
>>>>>> >
>>>>>> > Read this topic online here:
>>>>>> >
>>>>>> > http://forums.matronics.com/viewtopic.php?p=442717#442717
>>>>>> >
>>>>>> >
>>>>>> >
>>>>>> > http://www.matronics.com/Navig==========================p;
>>>>>> -===========================nbsp; -Matt Dralle, List
>>>>>> Admin.<=========================
>>>>>>
>>>>>>
>>>>>>
>>>>>> ~,%4M4} r{ (8^a D K
>>>>>> j',.+- 5 h ,z^.+-
>>>>>> Tn+bp+r y'C { ,x(ZP >
>>>>>> -Zvkkj+ykym-&j',r5
>>>>>> h.+-i0fr(Z( jB0 8 Ia
>>>>>> T1$+y\{^j)ZnWayg +k&j',r
>>>>>> +k&j',rh*' gJ+^N *.~zw,h
>>>>>> jY^.+-
>>>>>> kym-&j',rr&*'i0fr((nb {
>>>>>> nr f
>>>>> *
>>>>>
>>>>> D============================================
>>>>> ist"">http://www.matronics.com/Navigator?Yak-List
>>>>> D============================================
>>>>> //forums.matronics.com <http://forums.matronics.com>
>>>>> D============================================
>>>>> ot;">http://www.matronics.com/contribution
>>>>> D============================================
>>>>>
>>>>> *
>>>> *
>>>>
>>>> href="http://www.matronics.com/Navigator?Yak-List">http://www.matronics.com/Navigator?Yak-List
>>>> href="http://forums.matronics.com/">http://forums.matronics.com
>>>> href="http://www.matronics.com/contribution">http://www.matronics.com/contribution
>>>>
>>>> *
>>>
>>> *
>>>
>>> D============================================
>>> ist"">http://www.matronics.com/Navigator?Yak-List
>>> D============================================
>>> //forums.matronics.com <http://forums.matronics.com>
>>> D============================================
>>> ot;">http://www.matronics.com/contribution
>>> D============================================
>>>
>>> *
>> *
>>
>> D============================================
>> ist"">http://www.matronics.com/Navigator?Yak-List
>> D============================================= <http://www.matronics.com/Navigator?Yak-ListD=============================================>
>> //forums.matronics.com <http://forums.matronics.com>
>> D============================================
>> ot;">http://www.matronics.com/contribution
>> D============================================= <http://www.matronics.com/contributionD=============================================>
>>
>> *
>
> *
>
> et="_blank">http://www.matronics.com/Navigator?Yak-List
> tp://forums.matronics.com
> _blank">http://www.matronics.com/contribution
>
> *
>
>
> *
>
>
> *
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| Subject: | Re: =?utf-8?Q?Re:_Yak-List:_Re:_Engine_roughness,_as_in_stops._starts._stops.?= |
=?utf-8?Q?__starts.?
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Message 9
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| Subject: | Re: Engine roughness, as in stops. starts. stops. starts. |
I don't find it strange about the momentarily drop or roughness. Because
the "looseness" of tolerances of these engines -say as to compare to a
Merlin - its very hard to get the mags perfecticly aligned with each other.
There is that much 'slop' in the gear trains. With that in mind remember
there is a process taking place in the cylinder where the fuel/air mixture is
being ignited by both mags. If one mag drops, yes the other takes over but
the process is changed ever so slightly, that you can't help notice it.
Just recently I noticed the very different sound between two different
Merlin engines. One shaper or 'crackly' than the other. The expert engineer
explained one engine had been overhauled according to RR specs while the
smoother engine had a number of specialized changes such cam lob shape,
timing, plugs, etc - all done to take complete advantage of the known dynamics
in those Merlin cylinders. This engine will most likely make 1,000 hours
BTW.
For about 2 years time, I chased recurring ignition problems, suspecting
plugs, and mags (i.e. coils). On the way to OSH one year (Why is it always
seem to happen to me on the way to or from OSH?) over Americas, GA. after
about an hour and a half airborne, the engine (M-14P) suddenly missed and
stared to run slightly different. Well it took a young (God bless his grease
covered face.) Georgia hick of a A&P at a crop dusting outfit, to find the
problem. My harness was breaking down. Right then and there I went to
auto plugs and harness. The original harness are well built and nicely done
BUT will not last forever, and will start arching out inside the casing.
Jim "Pappy" Goolsby
In a message dated 5/29/2015 8:41:36 A.M. Eastern Daylight Time,
info@flyingwarbirds.com.au writes:
--> Yak-List message posted by: "JL2A" <info@flyingwarbirds.com.au>
Hi all, thanks for the on and off list replies. Very greatly appreciated
believe me, the owner has delivered the aircraft to the mechanics and they
were starting with their belief it is the mixture setting.
He has been informed and will be starting with new magneto coils instead
now though!
I had a points spring break on one mag once, so it killed the mag
completely and I do remember an attention-grabbing splutter and then the engine
continued sounding more or less normal (was at low power on base). Strange how
one mag dropping off seems to momentarily affect the other...
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=442739#442739
Message 10
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| Subject: | Re: Engine roughness, as in stops. starts. stops. starts. |
I think Mark is right on the money here.
Jim "Pappy" Goolsby
In a message dated 5/29/2015 11:00:01 A.M. Eastern Daylight Time,
mark.bitterlich@navy.mil writes:
--> Yak-List message posted by: "Bitterlich, Mark G CIV NAVAIR, WD"
<mark.bitterlich@navy.mil>
Might as well add my 2 cents. First of all, I totally concur with
Richard Goode, not only because he has been around these aircraft longer than
most anyone else on this list, but also because I have experienced the exact
same symptoms troubleshooting a YAK-52 just a few months ago.
Very likely NOT the carb. And this is not meant as sarcasm, but after
some "mechs" mess around with it for a while it might very well end up being
that as well. Very few people know how to adjust these pressure carbs
properly and there is much more to it than turning the "screw" on the outside.
Of course there is nothing like "doing" to help in learning, as long as
it is on your aircraft and not mine please. What I am saying here is that
messing around with the carb should be LAST on anyone's list and never
first. Also it is the nature of pressure carbs that if you adjust one thing,
it impacts another. Just had a Bendix PS-7BD rebuilt and flowed ($3000 by
the way) and while not Russian, the theory is the same and worth reading
about.
There is a very simple test to run here. Go up and fly it one more time
and just simply fly it until it starts doing this again, and then switch off
one mag and then the other to see if it then STOPS doing it or gets much
worse on one. It is very unusual for both mags to have something go bad
with them at the same time (thankfully). STRONGLY recommend this before
applying fingers or tools to the carb.
The problem with the coils is legendary. If you own one of these aircraft
it is not a matter of "if" you will have a coil go bad, but when. Other
things can cause the coil to over-heat faster and these range from wide
gaps on spark plugs, to misadjusted points "or dwell" as mentioned. Also, I
have seen the point assembly actually crack leading to erratic ignition (you
mentioned that one yourself). Points will not usually come out of
adjustment through normal use enough to cause what you are experiencing, but if
they are cracked and flexing they can cause these exact symptoms too.
I have had two personal experiences with mag issues on my own aircraft.
In one case, the internal gearing in the mag (M9F) let go, and the engine
just STOPPED. Ernie (in another message) mentioned that this should not
happen should it? Well, that is what we are all taught, but as it turns out
it is not necessarily accurate. I did not time how many seconds it just
STOPPED, but it was enough time for me to think: "Oh crap, I am going to
have to land this thing on the freaking OUTER BANKS! Should I go in gear up
or down?". And then it came back running rougher than blazes. I tried the
mag switch, and it ran on one mag perfectly and on the other it just
stopped. So why did that happen? It should not have. But it did. Lots of
"might be maybe" theory, but honestly I do not know.
Second time was a mag coil. Pretty much exactly what you are talking
about here. Again, simply switching between mags in flight isolated the
problem very quickly. Why did it impact engine performance on both? Well,
all I can think of is a spark plug firing way in advance. In my mind, only
three things can happen with ignition. It doesn't work at all, it fires
early, or it fires late. Not working at all would not make the engine cough
and gag, UNLESS you had a problem with the OTHER ignition set that you
didn't know about (bad plug, etc.) If it fired late, it would not matter at
all. But if it fired early... way early, as the piston was coming up on the
compression stroke ..... some weird stuff would happen, bad detonation and
engine coughing and puking being one. So that is my "theory".
If this test is performed in flight and it does it again on EITHER MAG,
then the next step is a compression test. But really, you need to fly it
one more time.
Mark
-----Original Message-----
From: owner-yak-list-server@matronics.com
[mailto:owner-yak-list-server@matronics.com] On Behalf Of JL2A
Sent: Friday, May 29, 2015 8:41 AM
Subject: Yak-List: Re: Engine roughness, as in stops. starts. stops.
starts.
Hi all, thanks for the on and off list replies. Very greatly appreciated
believe me, the owner has delivered the aircraft to the mechanics and they
were starting with their belief it is the mixture setting.
He has been informed and will be starting with new magneto coils instead
now though!
I had a points spring break on one mag once, so it killed the mag
completely and I do remember an attention-grabbing splutter and then the engine
continued sounding more or less normal (was at low power on base). Strange how
one mag dropping off seems to momentarily affect the other...
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=442739#442739
Message 11
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| Subject: | Re: Engine roughness, as in stops. starts. stops. starts. |
Thats very interesting. The reason I asked is because a friends CJ recently
had the same problem, and during diagnosis I told him in flight when the
problem occurred to switch mags to see if we could isolate it to a mag and
we couldn't, so I reasoned that it couldn't be ignition. He also replaced
the carb, checked mag timing, valve lash. Never did find the problem, and
he ended up changing engine, since he had a spare. It was really weird
cause it only happened above a thousand feet and never on the ground, even
if we ran it a full power for a considerable amount of time.
Ernie
On Fri, May 29, 2015 at 11:16 AM, A. Dennis Savarese <
dsavarese0812@bellsouth.net> wrote:
> dsavarese0812@bellsouth.net>
>
> Yes, it does Ernie. If you've never experienced a coil failure in one
> mag, I can tell you it WILL get your attention because if feels like the
> engine completely shuts down for one heartbeat, then picks back up again.
>
>
Message 12
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|
| Subject: | Re: Engine roughness, as in stops. starts. stops. starts. |
Mark,
Been there, got the T shirt x 3. Two for coils and one because the RU supplier
filled the mag bossing off and sold the mag as a 9F.
Doc
Sent from my iPad
> On May 29, 2015, at 9:58 AM, Bitterlich, Mark G CIV NAVAIR, WD <mark.bitterlich@navy.mil>
wrote:
>
>
> Might as well add my 2 cents. First of all, I totally concur with Richard Goode,
not only because he has been around these aircraft longer than most anyone
else on this list, but also because I have experienced the exact same symptoms
troubleshooting a YAK-52 just a few months ago.
>
> Very likely NOT the carb. And this is not meant as sarcasm, but after some
"mechs" mess around with it for a while it might very well end up being that as
well. Very few people know how to adjust these pressure carbs properly and
there is much more to it than turning the "screw" on the outside. Of course
there is nothing like "doing" to help in learning, as long as it is on your aircraft
and not mine please. What I am saying here is that messing around with
the carb should be LAST on anyone's list and never first. Also it is the nature
of pressure carbs that if you adjust one thing, it impacts another. Just
had a Bendix PS-7BD rebuilt and flowed ($3000 by the way) and while not Russian,
the theory is the same and worth reading about.
>
> There is a very simple test to run here. Go up and fly it one more time and
just simply fly it until it starts doing this again, and then switch off one mag
and then the other to see if it then STOPS doing it or gets much worse on one.
It is very unusual for both mags to have something go bad with them at
the same time (thankfully). STRONGLY recommend this before applying fingers
or tools to the carb.
>
> The problem with the coils is legendary. If you own one of these aircraft it
is not a matter of "if" you will have a coil go bad, but when. Other things
can cause the coil to over-heat faster and these range from wide gaps on spark
plugs, to misadjusted points "or dwell" as mentioned. Also, I have seen the
point assembly actually crack leading to erratic ignition (you mentioned that
one yourself). Points will not usually come out of adjustment through normal
use enough to cause what you are experiencing, but if they are cracked and flexing
they can cause these exact symptoms too.
>
> I have had two personal experiences with mag issues on my own aircraft. In one
case, the internal gearing in the mag (M9F) let go, and the engine just STOPPED.
Ernie (in another message) mentioned that this should not happen should
it? Well, that is what we are all taught, but as it turns out it is not necessarily
accurate. I did not time how many seconds it just STOPPED, but it
was enough time for me to think: "Oh crap, I am going to have to land this thing
on the freaking OUTER BANKS! Should I go in gear up or down?". And then it
came back running rougher than blazes. I tried the mag switch, and it ran on
one mag perfectly and on the other it just stopped. So why did that happen?
It should not have. But it did. Lots of "might be maybe" theory, but honestly
I do not know.
>
> Second time was a mag coil. Pretty much exactly what you are talking about here.
Again, simply switching between mags in flight isolated the problem very
quickly. Why did it impact engine performance on both? Well, all I can think
of is a spark plug firing way in advance. In my mind, only three things
can happen with ignition. It doesn't work at all, it fires early, or it fires
late. Not working at all would not make the engine cough and gag, UNLESS you
had a problem with the OTHER ignition set that you didn't know about (bad plug,
etc.) If it fired late, it would not matter at all. But if it fired early...
way early, as the piston was coming up on the compression stroke ..... some
weird stuff would happen, bad detonation and engine coughing and puking being
one. So that is my "theory".
>
> If this test is performed in flight and it does it again on EITHER MAG, then
the next step is a compression test. But really, you need to fly it one more
time.
>
> Mark
>
>
>
>
> -----Original Message-----
> From: owner-yak-list-server@matronics.com [mailto:owner-yak-list-server@matronics.com] On Behalf Of JL2A
> Sent: Friday, May 29, 2015 8:41 AM
> To: yak-list@matronics.com
> Subject: Yak-List: Re: Engine roughness, as in stops. starts. stops. starts.
>
>
> Hi all, thanks for the on and off list replies. Very greatly appreciated believe
me, the owner has delivered the aircraft to the mechanics and they were starting
with their belief it is the mixture setting.
>
> He has been informed and will be starting with new magneto coils instead now
though!
>
> I had a points spring break on one mag once, so it killed the mag completely
and I do remember an attention-grabbing splutter and then the engine continued
sounding more or less normal (was at low power on base). Strange how one mag
dropping off seems to momentarily affect the other...
>
>
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=442739#442739
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
Message 13
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|
| Subject: | Re: Engine roughness, as in stops. starts. stops. starts. |
Ps. Dan, it was Dennis and I that was working that problem on my 52 in 2003. The
problem began less than 10 hours out of the container fresh from Lithuanian
overhaul. When the breaking down mag discharges it sends the charge to all the
cylinders resulting in the supercharger fuel charge being burn in one giant backfire!
It is an attention getter! The engine quits for a heartbeat the runs
like shit on one mag... The bad one or it does not run at all when the bad mag
is selected. The airborne mag check will sort that out. So go buckle up your
balls and go fly. 15 + or - 5 minutes later you'll have your answer. Like I said
have the T shirt x3.
You can get the T shirt too!
Doc
Sent from my iPad
> On May 29, 2015, at 10:16 AM, A. Dennis Savarese <dsavarese0812@bellsouth.net>
wrote:
>
>
> Yes, it does Ernie. If you've never experienced a coil failure in one mag, I
can tell you it WILL get your attention because if feels like the engine completely
shuts down for one heartbeat, then picks back up again.
>
> I was told by someone with a lot more life experiences than me that another older
radial (can't remember if it was one of the small Continental's like was
used on the Stearmanor Wright or Pratt)the engineers determined when the coil
failed like being discussed here, the fuel charge through the supercharger (ie:
fuel distribution point) is completely purged for one heartbeat causing the
sensation of a complete shutdown for a few millisecondsand then recharged and
the engine picks back up. It's really weird. But I can tell you from many experiences,
that's what it feels like. Maybe someone onthe list can better define
why it feels like a complete shutdown for a heartbeat.
>
> FWIW, I have been able to duplicate the problem on the ground by heating up the
engine to above about 250 degrees C as read on the CHT. As Richard Goode has
stated, it definitely is a heat problem with the coil which typically occurs
in the first 20-30 minutes of the flight. Repeating it on the ground is more
difficult. But it can be done. If you can get the coil hot enoughon the ground,
the engine will start to misfire. Once THAT occurs, you can isolate the problem
to the left or right mag with the mag switch.
>
> A. Dennis Savarese
> 334-546-8182 (mobile)
> www.yak-52.com
> Skype - Yakguy1
>
>> On 5/29/2015 8:54 AM, Ernest Martinez wrote:
>> Quick question.
>>
>> Wouldn't a coil problem only manifest itself on 1 side? A complete loss of 1
Mag shouldn't cause an abrupt and complete loss of power should it?
>>
>> Ernie
>>
>> On Fri, May 29, 2015 at 9:43 AM, migfighter42 <migfighter42@gmail.com <mailto:migfighter42@gmail.com>> wrote:
>>
>> If its the fuel pump, you should see it on the fuel pressure gauge.
>>
>> if it is the valve train, that should be a problem noticed at all
>> times, a loss of perforce irrespective of time and temperature.
>>
>> If it is always happening after a certain period of time in flight
>> everytime, its coil related. We had this exact problem a year ago,
>> took us forever to find it. Dennis and Jill finally got us on the
>> right path.
>>
>> Good luck.
>>
>> Bill
>>
>>
>>
>> Sent from my T-Mobile 4G LTE Device
>> -------- Original message --------
>> From: Dan Payne <dantpayne@icloud.com <mailto:dantpayne@icloud.com>>
>> Date: 05/29/2015 12:28 AM (GMT-06:00)
>> To: yak-list@matronics.com <mailto:yak-list@matronics.com>
>> Subject: Re: Yak-List: Engine roughness, as in stops. starts.
>> stops. starts.
>>
>> However..."engine cuts abruptly, goes, cuts again, goes. Mixture
>> full rich, carb heat on, didn't do it again but then these items
>> were actioned after running fine for a few seconds."
>>
>> If you went full rich, then turned on the carb heat (making the
>> mixture even more rich) that's answers you own dilemma / question.
>>
>> Change the fuel pump
>>
>> Keep 'em Flyin',
>>
>> Dan Payne
>> Owner, Pilot, A&P-IA
>> (423)-544-8946 <tel:%28423%29-544-8946>
>>
>> Volunteer Aero Service
>> Dallas Bay Skypark
>> 1824 E Crabtree Road
>> Hixson, TN 37343
>>
>> "Where Airworthiness Means Business!"
>>
>>
>> On May 29, 2015, at 1:19 AM, Dan Payne <dantpayne@icloud.com
>> <mailto:dantpayne@icloud.com>> wrote:
>>
>>> Ps....if you throw fuel to it mid-flight and it burst back to
>>> life...I would suspect a worn out engine driven pump...
>>>
>>> Keep 'em Flyin',
>>>
>>> Dan Payne
>>> Owner, Pilot, A&P-IA
>>> (423)-544-8946 <tel:%28423%29-544-8946>
>>>
>>> Volunteer Aero
>>> Dallas Bay Skypark
>>> 1824 E Crabtree Road
>>> Hixson, TN 37343
>>>
>>> "Where Airworthiness Means Business!"
>>>
>>>
>>> On May 29, 2015, at 1:01 AM, Bill Geipel <l129bs@gmail.com
>>> <mailto:l129bs@gmail.com>> wrote:
>>>
>>>> Adjust my what?? v-a-l-v-e-s? Like consonants?
>>>>
>>>> You do many annuals? You must be rich"
>>>>
>>>> Im not rich, no nothing about radials, why should I, we have
>>>> guys like you that are willing to do it while we lounge by the
>>>> pool, fly, camp, hike, bike, fly some more etc.
>>>> So everyone gets what they want.
>>>> I see your company name says Volunteer well, dont. Problem
>>>> for you, solved.
>>>> Shot mine, NOT bullet proof.
>>>>
>>>> Keep smiling.
>>>>
>>>> Bill Geipel
>>>> Owner, pilot, not A&P-IA
>>>> cant afford cell phone.
>>>>
>>>>
>>>> On May 29, 2015, at 1:00 PM, Dan Payne <dantpayne@icloud.com
>>>> <mailto:dantpayne@icloud.com>> wrote:
>>>>
>>>>> P.S.:
>>>>>
>>>>> Why don't you all adjust your valves??
>>>>>
>>>>> I do many annuals on "rich" people's airplanes who know nothing
>>>>> about Radials....
>>>>>
>>>>> The engines are reliable. The airframes are bullet proof, and
>>>>> Denis Savarese is your go to guy on 4th & 10!
>>>>>
>>>>> Keep 'em Flyin',
>>>>>
>>>>> Dan Payne
>>>>> Owner, Pilot, A&P-IA
>>>>> (423)-544-8946 <tel:%28423%29-544-8946>
>>>>>
>>>>> Volunteer Aero Services
>>>>> Dallas Bay Skypark
>>>>> 1824 E Crabtree Road
>>>>> Hixson, TN 37343
>>>>>
>>>>> "Where Airworthiness Means Business!"
>>>>>
>>>>>
>>>>> On May 28, 2015, at 11:46 PM, Dan Payne <dantpayne@icloud.com
>>>>> <mailto:dantpayne@icloud.com>> wrote:
>>>>>
>>>>>> Adjust the points/ breaker felts on the mags...
>>>>>>
>>>>>>
>>>>>> Let not forget the dwell timing / distributor advance in our
>>>>>> GTOs we drove to high school...
>>>>>>
>>>>>> Keep 'em Flyin',
>>>>>>
>>>>>> Dan Payne
>>>>>> Owner, Pilot, A&P-IA
>>>>>> (423)-544-8946 <tel:%28423%29-544-8946>
>>>>>>
>>>>>> Volunteer Aero Service
>>>>>> Dallas Bay Skypark
>>>>>> 1824 E Crabtree Road
>>>>>> Hixson, TN 37343
>>>>>>
>>>>>> "Where Airworthiness Means Business!"
>>>>>>
>>>>>>
>>>>>> On May 28, 2015, at 11:03 PM, migfighter42
>>>>>> <migfighter42@gmail.com <mailto:migfighter42@gmail.com>> wrote:
>>>>>>
>>>>>>> my experience with that problem is the same as Doc mentioned.
>>>>>>> the aircraft would run fine until warmed up, normally in
>>>>>>> flight, then dramatic misses. replaced the coils in the
>>>>>>> magnetos, the problem went away.
>>>>>>>
>>>>>>> Bill
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>> Sent from my T-Mobile 4G LTE Device
>>>>>>> -------- Original message --------
>>>>>>> From: Roger Kemp <f16viperdoc@me.com
>>>>>>> <mailto:f16viperdoc@me.com>>
>>>>>>> Date: 05/28/2015 8:47 PM (GMT-06:00)
>>>>>>> To: yak-list@matronics.com <mailto:yak-list@matronics.com>
>>>>>>> Subject: Re: Yak-List: Engine roughness, as in stops. starts.
>>>>>>> stops. starts.
>>>>>>>
>>>>>>> <f16viperdoc@me.com <mailto:f16viperdoc@me.com>>
>>>>>>>
>>>>>>> Mag coil going bad will also do that. Typically occurs about
>>>>>>> 10 to 15 minutes of the flight.
>>>>>>> Doc
>>>>>>>
>>>>>>> Sent from my iPad
>>>>>>>
>>>>>>> > On May 28, 2015, at 6:55 PM, JL2A
>>>>>>> <info@flyingwarbirds.com.au
>>>>>>> <mailto:info@flyingwarbirds.com.au>> wrote:
>>>>>>> >
>>>>>>> <info@flyingwarbirds.com.au <mailto:info@flyingwarbirds.com.au>>
>>>>>>> >
>>>>>>> > Hi all, my formation partner had a bit of engine trouble
>>>>>>> last time we flew then I took the same plane up for a shake
>>>>>>> down and got the same result -
>>>>>>> >
>>>>>>> > cruise power, 10 minutes into the flight, engine cuts
>>>>>>> abruptly, goes, cuts again, goes. Mixture full rich, carb
>>>>>>> heat on, didn't do it again but then these items were
>>>>>>> actioned after running fine for a few seconds.
>>>>>>> >
>>>>>>> > The cuts were hard, as in no power not just roughness, and
>>>>>>> only for a split second, but enough to get your attention.
>>>>>>> >
>>>>>>> > Speaking to two local CJ/Yak experts and they say it is
>>>>>>> likely the 'mid-range' mixture adjustment (I think the CJ
>>>>>>> book calls it 'cruise' mixture, same thing).
>>>>>>> >
>>>>>>> > Has anyone here experienced the same? Would be curious as
>>>>>>> to what an earth is going on, intermittent failures are the
>>>>>>> worst!
>>>>>>> >
>>>>>>> >
>>>>>>> >
>>>>>>> >
>>>>>>> > Read this topic online here:
>>>>>>> >
>>>>>>> > http://forums.matronics.com/viewtopic.php?p=442717#442717
>>>>>>> >
>>>>>>> >
>>>>>>> >
>>>>>>> > http://www.matronics.com/Navig==========================p;
>>>>>>> -===========================nbsp; -Matt Dralle, List
>>>>>>> Admin.<=========================
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>> ~,%4M4} r{ (8^a D K
>>>>>>> j',.+- 5 h ,z^.+-
>>>>>>> Tn+bp+r y'C { ,x(ZP >
>>>>>>> -Zvkkj+ykym-&j',r5
>>>>>>> h.+-i0fr(Z( jB0 8 Ia
>>>>>>> T1$+y\{^j)ZnWayg +k&j',r
>>>>>>> +k&j',rh*' gJ+^N *.~zw,h
>>>>>>> jY^.+-
>>>>>>> kym-&j',rr&*'i0fr((nb {
>>>>>>> nr f
>>>>>> *
>>>>>>
>>>>>> D============================================
>>>>>> ist"">http://www.matronics.com/Navigator?Yak-List
>>>>>> D============================================
>>>>>> //forums.matronics.com <http://forums.matronics.com>
>>>>>> D============================================
>>>>>> ot;">http://www.matronics.com/contribution
>>>>>> D============================================
>>>>>>
>>>>>> *
>>>>> *
>>>>>
>>>>> href="http://www.matronics.com/Navigator?Yak-List">http://www.matronics.com/Navigator?Yak-List
>>>>> href="http://forums.matronics.com/">http://forums.matronics.com
>>>>> href="http://www.matronics.com/contribution">http://www.matronics.com/contribution
>>>>>
>>>>> *
>>>>
>>>> *
>>>>
>>>> D============================================
>>>> ist"">http://www.matronics.com/Navigator?Yak-List
>>>> D============================================
>>>> //forums.matronics.com <http://forums.matronics.com>
>>>> D============================================
>>>> ot;">http://www.matronics.com/contribution
>>>> D============================================
>>>>
>>>> *
>>> *
>>>
>>> D============================================
>>> ist"">http://www.matronics.com/Navigator?Yak-List
>>> D============================================= <http://www.matronics.com/Navigator?Yak-ListD=============================================>
>>> //forums.matronics.com <http://forums.matronics.com>
>>> D============================================
>>> ot;">http://www.matronics.com/contribution
>>> D============================================= <http://www.matronics.com/contributionD=============================================>
>>>
>>> *
>>
>> *
>>
>> et="_blank">http://www.matronics.com/Navigator?Yak-List
>> tp://forums.matronics.com
>> _blank">http://www.matronics.com/contribution
>>
>> *
>>
>>
>> *
>>
>>
>> *
>
>
>
>
>
Message 14
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|
| Subject: | Re: Engine roughness, as in stops. starts. stops. starts. |
Doc,
Will all due respect I understand.
When I first got my 52 I did a mag check at 80 & 8...left side made it feel like
I was gonna blow the jugs off. Bought a mag off Barnstormers, installed, and
no more problem.
Then, I got to disassemble & "play with my old one...initially I couldn't find
the problem...took it down to the local electro shop and they put it under load
for me. You're right...it was the coil.
Keep 'em Flyin',
Dan Payne
Owner, Pilot, A&P-IA
(423)-544-8946
Volunteer Aero Service
Dallas Bay Skypark
1824 E Crabtree Road
Hixson, TN 37343
"Where Airworthiness Means Business!"
> On May 29, 2015, at 3:25 PM, Roger Kemp <f16viperdoc@me.com> wrote:
>
>
> Ps. Dan, it was Dennis and I that was working that problem on my 52 in 2003.
The problem began less than 10 hours out of the container fresh from Lithuanian
overhaul. When the breaking down mag discharges it sends the charge to all the
cylinders resulting in the supercharger fuel charge being burn in one giant
backfire! It is an attention getter! The engine quits for a heartbeat the runs
like shit on one mag... The bad one or it does not run at all when the bad mag
is selected. The airborne mag check will sort that out. So go buckle up your
balls and go fly. 15 + or - 5 minutes later you'll have your answer. Like I
said have the T shirt x3.
> You can get the T shirt too!
> Doc
>
> Sent from my iPad
>
>> On May 29, 2015, at 10:16 AM, A. Dennis Savarese <dsavarese0812@bellsouth.net>
wrote:
>>
>>
>> Yes, it does Ernie. If you've never experienced a coil failure in one mag,
I can tell you it WILL get your attention because if feels like the engine completely
shuts down for one heartbeat, then picks back up again.
>>
>> I was told by someone with a lot more life experiences than me that another
older radial (can't remember if it was one of the small Continental's like was
used on the Stearmanor Wright or Pratt)the engineers determined when the coil
failed like being discussed here, the fuel charge through the supercharger (ie:
fuel distribution point) is completely purged for one heartbeat causing the
sensation of a complete shutdown for a few millisecondsand then recharged and
the engine picks back up. It's really weird. But I can tell you from many experiences,
that's what it feels like. Maybe someone onthe list can better define
why it feels like a complete shutdown for a heartbeat.
>>
>> FWIW, I have been able to duplicate the problem on the ground by heating up
the engine to above about 250 degrees C as read on the CHT. As Richard Goode has
stated, it definitely is a heat problem with the coil which typically occurs
in the first 20-30 minutes of the flight. Repeating it on the ground is more
difficult. But it can be done. If you can get the coil hot enoughon the ground,
the engine will start to misfire. Once THAT occurs, you can isolate the problem
to the left or right mag with the mag switch.
>>
>> A. Dennis Savarese
>> 334-546-8182 (mobile)
>> www.yak-52.com
>> Skype - Yakguy1
>>
>>> On 5/29/2015 8:54 AM, Ernest Martinez wrote:
>>> Quick question.
>>>
>>> Wouldn't a coil problem only manifest itself on 1 side? A complete loss of
1 Mag shouldn't cause an abrupt and complete loss of power should it?
>>>
>>> Ernie
>>>
>>> On Fri, May 29, 2015 at 9:43 AM, migfighter42 <migfighter42@gmail.com <mailto:migfighter42@gmail.com>> wrote:
>>>
>>> If its the fuel pump, you should see it on the fuel pressure gauge.
>>>
>>> if it is the valve train, that should be a problem noticed at all
>>> times, a loss of perforce irrespective of time and temperature.
>>>
>>> If it is always happening after a certain period of time in flight
>>> everytime, its coil related. We had this exact problem a year ago,
>>> took us forever to find it. Dennis and Jill finally got us on the
>>> right path.
>>>
>>> Good luck.
>>>
>>> Bill
>>>
>>>
>>>
>>> Sent from my T-Mobile 4G LTE Device
>>> -------- Original message --------
>>> From: Dan Payne <dantpayne@icloud.com <mailto:dantpayne@icloud.com>>
>>> Date: 05/29/2015 12:28 AM (GMT-06:00)
>>> To: yak-list@matronics.com <mailto:yak-list@matronics.com>
>>> Subject: Re: Yak-List: Engine roughness, as in stops. starts.
>>> stops. starts.
>>>
>>> However..."engine cuts abruptly, goes, cuts again, goes. Mixture
>>> full rich, carb heat on, didn't do it again but then these items
>>> were actioned after running fine for a few seconds."
>>>
>>> If you went full rich, then turned on the carb heat (making the
>>> mixture even more rich) that's answers you own dilemma / question.
>>>
>>> Change the fuel pump
>>>
>>> Keep 'em Flyin',
>>>
>>> Dan Payne
>>> Owner, Pilot, A&P-IA
>>> (423)-544-8946 <tel:%28423%29-544-8946>
>>>
>>> Volunteer Aero Service
>>> Dallas Bay Skypark
>>> 1824 E Crabtree Road
>>> Hixson, TN 37343
>>>
>>> "Where Airworthiness Means Business!"
>>>
>>>
>>> On May 29, 2015, at 1:19 AM, Dan Payne <dantpayne@icloud.com
>>> <mailto:dantpayne@icloud.com>> wrote:
>>>
>>>> Ps....if you throw fuel to it mid-flight and it burst back to
>>>> life...I would suspect a worn out engine driven pump...
>>>>
>>>> Keep 'em Flyin',
>>>>
>>>> Dan Payne
>>>> Owner, Pilot, A&P-IA
>>>> (423)-544-8946 <tel:%28423%29-544-8946>
>>>>
>>>> Volunteer Aero
>>>> Dallas Bay Skypark
>>>> 1824 E Crabtree Road
>>>> Hixson, TN 37343
>>>>
>>>> "Where Airworthiness Means Business!"
>>>>
>>>>
>>>> On May 29, 2015, at 1:01 AM, Bill Geipel <l129bs@gmail.com
>>>> <mailto:l129bs@gmail.com>> wrote:
>>>>
>>>>> Adjust my what?? v-a-l-v-e-s? Like consonants?
>>>>>
>>>>> You do many annuals? You must be rich"
>>>>>
>>>>> Im not rich, no nothing about radials, why should I, we have
>>>>> guys like you that are willing to do it while we lounge by the
>>>>> pool, fly, camp, hike, bike, fly some more etc.
>>>>> So everyone gets what they want.
>>>>> I see your company name says Volunteer well, dont. Problem
>>>>> for you, solved.
>>>>> Shot mine, NOT bullet proof.
>>>>>
>>>>> Keep smiling.
>>>>>
>>>>> Bill Geipel
>>>>> Owner, pilot, not A&P-IA
>>>>> cant afford cell phone.
>>>>>
>>>>>
>>>>> On May 29, 2015, at 1:00 PM, Dan Payne <dantpayne@icloud.com
>>>>> <mailto:dantpayne@icloud.com>> wrote:
>>>>>
>>>>>> P.S.:
>>>>>>
>>>>>> Why don't you all adjust your valves??
>>>>>>
>>>>>> I do many annuals on "rich" people's airplanes who know nothing
>>>>>> about Radials....
>>>>>>
>>>>>> The engines are reliable. The airframes are bullet proof, and
>>>>>> Denis Savarese is your go to guy on 4th & 10!
>>>>>>
>>>>>> Keep 'em Flyin',
>>>>>>
>>>>>> Dan Payne
>>>>>> Owner, Pilot, A&P-IA
>>>>>> (423)-544-8946 <tel:%28423%29-544-8946>
>>>>>>
>>>>>> Volunteer Aero Services
>>>>>> Dallas Bay Skypark
>>>>>> 1824 E Crabtree Road
>>>>>> Hixson, TN 37343
>>>>>>
>>>>>> "Where Airworthiness Means Business!"
>>>>>>
>>>>>>
>>>>>> On May 28, 2015, at 11:46 PM, Dan Payne <dantpayne@icloud.com
>>>>>> <mailto:dantpayne@icloud.com>> wrote:
>>>>>>
>>>>>>> Adjust the points/ breaker felts on the mags...
>>>>>>>
>>>>>>>
>>>>>>> Let not forget the dwell timing / distributor advance in our
>>>>>>> GTOs we drove to high school...
>>>>>>>
>>>>>>> Keep 'em Flyin',
>>>>>>>
>>>>>>> Dan Payne
>>>>>>> Owner, Pilot, A&P-IA
>>>>>>> (423)-544-8946 <tel:%28423%29-544-8946>
>>>>>>>
>>>>>>> Volunteer Aero Service
>>>>>>> Dallas Bay Skypark
>>>>>>> 1824 E Crabtree Road
>>>>>>> Hixson, TN 37343
>>>>>>>
>>>>>>> "Where Airworthiness Means Business!"
>>>>>>>
>>>>>>>
>>>>>>> On May 28, 2015, at 11:03 PM, migfighter42
>>>>>>> <migfighter42@gmail.com <mailto:migfighter42@gmail.com>> wrote:
>>>>>>>
>>>>>>>> my experience with that problem is the same as Doc mentioned.
>>>>>>>> the aircraft would run fine until warmed up, normally in
>>>>>>>> flight, then dramatic misses. replaced the coils in the
>>>>>>>> magnetos, the problem went away.
>>>>>>>>
>>>>>>>> Bill
>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>> Sent from my T-Mobile 4G LTE Device
>>>>>>>> -------- Original message --------
>>>>>>>> From: Roger Kemp <f16viperdoc@me.com
>>>>>>>> <mailto:f16viperdoc@me.com>>
>>>>>>>> Date: 05/28/2015 8:47 PM (GMT-06:00)
>>>>>>>> To: yak-list@matronics.com <mailto:yak-list@matronics.com>
>>>>>>>> Subject: Re: Yak-List: Engine roughness, as in stops. starts.
>>>>>>>> stops. starts.
>>>>>>>>
>>>>>>>> <f16viperdoc@me.com <mailto:f16viperdoc@me.com>>
>>>>>>>>
>>>>>>>> Mag coil going bad will also do that. Typically occurs about
>>>>>>>> 10 to 15 minutes of the flight.
>>>>>>>> Doc
>>>>>>>>
>>>>>>>> Sent from my iPad
>>>>>>>>
>>>>>>>>> On May 28, 2015, at 6:55 PM, JL2A
>>>>>>>> <info@flyingwarbirds.com.au
>>>>>>>> <mailto:info@flyingwarbirds.com.au>> wrote:
>>>>>>>>>
>>>>>>>> <info@flyingwarbirds.com.au <mailto:info@flyingwarbirds.com.au>>
>>>>>>>>>
>>>>>>>>> Hi all, my formation partner had a bit of engine trouble
>>>>>>>> last time we flew then I took the same plane up for a shake
>>>>>>>> down and got the same result -
>>>>>>>>>
>>>>>>>>> cruise power, 10 minutes into the flight, engine cuts
>>>>>>>> abruptly, goes, cuts again, goes. Mixture full rich, carb
>>>>>>>> heat on, didn't do it again but then these items were
>>>>>>>> actioned after running fine for a few seconds.
>>>>>>>>>
>>>>>>>>> The cuts were hard, as in no power not just roughness, and
>>>>>>>> only for a split second, but enough to get your attention.
>>>>>>>>>
>>>>>>>>> Speaking to two local CJ/Yak experts and they say it is
>>>>>>>> likely the 'mid-range' mixture adjustment (I think the CJ
>>>>>>>> book calls it 'cruise' mixture, same thing).
>>>>>>>>>
>>>>>>>>> Has anyone here experienced the same? Would be curious as
>>>>>>>> to what an earth is going on, intermittent failures are the
>>>>>>>> worst!
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>>>>> Read this topic online here:
>>>>>>>>>
>>>>>>>>> http://forums.matronics.com/viewtopic.php?p=442717#442717
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>>>>> http://www.matronics.com/Navig==========================p;
>>>>>>>> -===========================nbsp; -Matt Dralle, List
>>>>>>>> Admin.<=========================
>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>> ~,%4M4} r{ (8^a D K
>>>>>>>> j',.+- 5 h ,z^.+-
>>>>>>>> Tn+bp+r y'C { ,x(ZP >
>>>>>>>> -Zvkkj+ykym-&j',r5
>>>>>>>> h.+-i0fr(Z( jB0 8 Ia
>>>>>>>> T1$+y\{^j)ZnWayg +k&j',r
>>>>>>>> +k&j',rh*' gJ+^N *.~zw,h
>>>>>>>> jY^.+-
>>>>>>>> kym-&j',rr&*'i0fr((nb {
>>>>>>>> nr f
>>>>>>> *
>>>>>>>
>>>>>>> D============================================
>>>>>>> ist"">http://www.matronics.com/Navigator?Yak-List
>>>>>>> D============================================
>>>>>>> //forums.matronics.com <http://forums.matronics.com>
>>>>>>> D============================================
>>>>>>> ot;">http://www.matronics.com/contribution
>>>>>>> D============================================
>>>>>>>
>>>>>>> *
>>>>>> *
>>>>>>
>>>>>> href="http://www.matronics.com/Navigator?Yak-List">http://www.matronics.com/Navigator?Yak-List
>>>>>> href="http://forums.matronics.com/">http://forums.matronics.com
>>>>>> href="http://www.matronics.com/contribution">http://www.matronics.com/contribution
>>>>>>
>>>>>> *
>>>>>
>>>>> *
>>>>>
>>>>> D============================================
>>>>> ist"">http://www.matronics.com/Navigator?Yak-List
>>>>> D============================================
>>>>> //forums.matronics.com <http://forums.matronics.com>
>>>>> D============================================
>>>>> ot;">http://www.matronics.com/contribution
>>>>> D============================================
>>>>>
>>>>> *
>>>> *
>>>>
>>>> D============================================
>>>> ist"">http://www.matronics.com/Navigator?Yak-List
>>>> D============================================= <http://www.matronics.com/Navigator?Yak-ListD=============================================>
>>>> //forums.matronics.com <http://forums.matronics.com>
>>>> D============================================
>>>> ot;">http://www.matronics.com/contribution
>>>> D============================================= <http://www.matronics.com/contributionD=============================================>
>>>>
>>>> *
>>>
>>> *
>>>
>>> et="_blank">http://www.matronics.com/Navigator?Yak-List
>>> tp://forums.matronics.com
>>> _blank">http://www.matronics.com/contribution
>>>
>>> *
>>>
>>>
>>> *
>>>
>>>
>>> *
>
>
>
>
>
Message 15
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|
| Subject: | Re: Engine roughness, as in stops. starts. stops. starts. |
Just tested an M-14P equipped Nanchang today and damn if this didn't happen. You
guys need to stop jinxing things!!!
Richard Hess
C 404-964-4885
> On May 29, 2015, at 3:25 PM, Roger Kemp <f16viperdoc@me.com> wrote:
>
>
> Ps. Dan, it was Dennis and I that was working that problem on my 52 in 2003.
The problem began less than 10 hours out of the container fresh from Lithuanian
overhaul. When the breaking down mag discharges it sends the charge to all the
cylinders resulting in the supercharger fuel charge being burn in one giant
backfire! It is an attention getter! The engine quits for a heartbeat the runs
like shit on one mag... The bad one or it does not run at all when the bad mag
is selected. The airborne mag check will sort that out. So go buckle up your
balls and go fly. 15 + or - 5 minutes later you'll have your answer. Like I
said have the T shirt x3.
> You can get the T shirt too!
> Doc
>
> Sent from my iPad
>
>> On May 29, 2015, at 10:16 AM, A. Dennis Savarese <dsavarese0812@bellsouth.net>
wrote:
>>
>>
>> Yes, it does Ernie. If you've never experienced a coil failure in one mag,
I can tell you it WILL get your attention because if feels like the engine completely
shuts down for one heartbeat, then picks back up again.
>>
>> I was told by someone with a lot more life experiences than me that another
older radial (can't remember if it was one of the small Continental's like was
used on the Stearmanor Wright or Pratt)the engineers determined when the coil
failed like being discussed here, the fuel charge through the supercharger (ie:
fuel distribution point) is completely purged for one heartbeat causing the
sensation of a complete shutdown for a few millisecondsand then recharged and
the engine picks back up. It's really weird. But I can tell you from many experiences,
that's what it feels like. Maybe someone onthe list can better define
why it feels like a complete shutdown for a heartbeat.
>>
>> FWIW, I have been able to duplicate the problem on the ground by heating up
the engine to above about 250 degrees C as read on the CHT. As Richard Goode has
stated, it definitely is a heat problem with the coil which typically occurs
in the first 20-30 minutes of the flight. Repeating it on the ground is more
difficult. But it can be done. If you can get the coil hot enoughon the ground,
the engine will start to misfire. Once THAT occurs, you can isolate the problem
to the left or right mag with the mag switch.
>>
>> A. Dennis Savarese
>> 334-546-8182 (mobile)
>> www.yak-52.com
>> Skype - Yakguy1
>>
>>> On 5/29/2015 8:54 AM, Ernest Martinez wrote:
>>> Quick question.
>>>
>>> Wouldn't a coil problem only manifest itself on 1 side? A complete loss of
1 Mag shouldn't cause an abrupt and complete loss of power should it?
>>>
>>> Ernie
>>>
>>> On Fri, May 29, 2015 at 9:43 AM, migfighter42 <migfighter42@gmail.com <mailto:migfighter42@gmail.com>> wrote:
>>>
>>> If its the fuel pump, you should see it on the fuel pressure gauge.
>>>
>>> if it is the valve train, that should be a problem noticed at all
>>> times, a loss of perforce irrespective of time and temperature.
>>>
>>> If it is always happening after a certain period of time in flight
>>> everytime, its coil related. We had this exact problem a year ago,
>>> took us forever to find it. Dennis and Jill finally got us on the
>>> right path.
>>>
>>> Good luck.
>>>
>>> Bill
>>>
>>>
>>>
>>> Sent from my T-Mobile 4G LTE Device
>>> -------- Original message --------
>>> From: Dan Payne <dantpayne@icloud.com <mailto:dantpayne@icloud.com>>
>>> Date: 05/29/2015 12:28 AM (GMT-06:00)
>>> To: yak-list@matronics.com <mailto:yak-list@matronics.com>
>>> Subject: Re: Yak-List: Engine roughness, as in stops. starts.
>>> stops. starts.
>>>
>>> However..."engine cuts abruptly, goes, cuts again, goes. Mixture
>>> full rich, carb heat on, didn't do it again but then these items
>>> were actioned after running fine for a few seconds."
>>>
>>> If you went full rich, then turned on the carb heat (making the
>>> mixture even more rich) that's answers you own dilemma / question.
>>>
>>> Change the fuel pump
>>>
>>> Keep 'em Flyin',
>>>
>>> Dan Payne
>>> Owner, Pilot, A&P-IA
>>> (423)-544-8946 <tel:%28423%29-544-8946>
>>>
>>> Volunteer Aero Service
>>> Dallas Bay Skypark
>>> 1824 E Crabtree Road
>>> Hixson, TN 37343
>>>
>>> "Where Airworthiness Means Business!"
>>>
>>>
>>> On May 29, 2015, at 1:19 AM, Dan Payne <dantpayne@icloud.com
>>> <mailto:dantpayne@icloud.com>> wrote:
>>>
>>>> Ps....if you throw fuel to it mid-flight and it burst back to
>>>> life...I would suspect a worn out engine driven pump...
>>>>
>>>> Keep 'em Flyin',
>>>>
>>>> Dan Payne
>>>> Owner, Pilot, A&P-IA
>>>> (423)-544-8946 <tel:%28423%29-544-8946>
>>>>
>>>> Volunteer Aero
>>>> Dallas Bay Skypark
>>>> 1824 E Crabtree Road
>>>> Hixson, TN 37343
>>>>
>>>> "Where Airworthiness Means Business!"
>>>>
>>>>
>>>> On May 29, 2015, at 1:01 AM, Bill Geipel <l129bs@gmail.com
>>>> <mailto:l129bs@gmail.com>> wrote:
>>>>
>>>>> Adjust my what?? v-a-l-v-e-s? Like consonants?
>>>>>
>>>>> You do many annuals? You must be rich"
>>>>>
>>>>> Im not rich, no nothing about radials, why should I, we have
>>>>> guys like you that are willing to do it while we lounge by the
>>>>> pool, fly, camp, hike, bike, fly some more etc.
>>>>> So everyone gets what they want.
>>>>> I see your company name says Volunteer well, dont. Problem
>>>>> for you, solved.
>>>>> Shot mine, NOT bullet proof.
>>>>>
>>>>> Keep smiling.
>>>>>
>>>>> Bill Geipel
>>>>> Owner, pilot, not A&P-IA
>>>>> cant afford cell phone.
>>>>>
>>>>>
>>>>> On May 29, 2015, at 1:00 PM, Dan Payne <dantpayne@icloud.com
>>>>> <mailto:dantpayne@icloud.com>> wrote:
>>>>>
>>>>>> P.S.:
>>>>>>
>>>>>> Why don't you all adjust your valves??
>>>>>>
>>>>>> I do many annuals on "rich" people's airplanes who know nothing
>>>>>> about Radials....
>>>>>>
>>>>>> The engines are reliable. The airframes are bullet proof, and
>>>>>> Denis Savarese is your go to guy on 4th & 10!
>>>>>>
>>>>>> Keep 'em Flyin',
>>>>>>
>>>>>> Dan Payne
>>>>>> Owner, Pilot, A&P-IA
>>>>>> (423)-544-8946 <tel:%28423%29-544-8946>
>>>>>>
>>>>>> Volunteer Aero Services
>>>>>> Dallas Bay Skypark
>>>>>> 1824 E Crabtree Road
>>>>>> Hixson, TN 37343
>>>>>>
>>>>>> "Where Airworthiness Means Business!"
>>>>>>
>>>>>>
>>>>>> On May 28, 2015, at 11:46 PM, Dan Payne <dantpayne@icloud.com
>>>>>> <mailto:dantpayne@icloud.com>> wrote:
>>>>>>
>>>>>>> Adjust the points/ breaker felts on the mags...
>>>>>>>
>>>>>>>
>>>>>>> Let not forget the dwell timing / distributor advance in our
>>>>>>> GTOs we drove to high school...
>>>>>>>
>>>>>>> Keep 'em Flyin',
>>>>>>>
>>>>>>> Dan Payne
>>>>>>> Owner, Pilot, A&P-IA
>>>>>>> (423)-544-8946 <tel:%28423%29-544-8946>
>>>>>>>
>>>>>>> Volunteer Aero Service
>>>>>>> Dallas Bay Skypark
>>>>>>> 1824 E Crabtree Road
>>>>>>> Hixson, TN 37343
>>>>>>>
>>>>>>> "Where Airworthiness Means Business!"
>>>>>>>
>>>>>>>
>>>>>>> On May 28, 2015, at 11:03 PM, migfighter42
>>>>>>> <migfighter42@gmail.com <mailto:migfighter42@gmail.com>> wrote:
>>>>>>>
>>>>>>>> my experience with that problem is the same as Doc mentioned.
>>>>>>>> the aircraft would run fine until warmed up, normally in
>>>>>>>> flight, then dramatic misses. replaced the coils in the
>>>>>>>> magnetos, the problem went away.
>>>>>>>>
>>>>>>>> Bill
>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>> Sent from my T-Mobile 4G LTE Device
>>>>>>>> -------- Original message --------
>>>>>>>> From: Roger Kemp <f16viperdoc@me.com
>>>>>>>> <mailto:f16viperdoc@me.com>>
>>>>>>>> Date: 05/28/2015 8:47 PM (GMT-06:00)
>>>>>>>> To: yak-list@matronics.com <mailto:yak-list@matronics.com>
>>>>>>>> Subject: Re: Yak-List: Engine roughness, as in stops. starts.
>>>>>>>> stops. starts.
>>>>>>>>
>>>>>>>> <f16viperdoc@me.com <mailto:f16viperdoc@me.com>>
>>>>>>>>
>>>>>>>> Mag coil going bad will also do that. Typically occurs about
>>>>>>>> 10 to 15 minutes of the flight.
>>>>>>>> Doc
>>>>>>>>
>>>>>>>> Sent from my iPad
>>>>>>>>
>>>>>>>>> On May 28, 2015, at 6:55 PM, JL2A
>>>>>>>> <info@flyingwarbirds.com.au
>>>>>>>> <mailto:info@flyingwarbirds.com.au>> wrote:
>>>>>>>>>
>>>>>>>> <info@flyingwarbirds.com.au <mailto:info@flyingwarbirds.com.au>>
>>>>>>>>>
>>>>>>>>> Hi all, my formation partner had a bit of engine trouble
>>>>>>>> last time we flew then I took the same plane up for a shake
>>>>>>>> down and got the same result -
>>>>>>>>>
>>>>>>>>> cruise power, 10 minutes into the flight, engine cuts
>>>>>>>> abruptly, goes, cuts again, goes. Mixture full rich, carb
>>>>>>>> heat on, didn't do it again but then these items were
>>>>>>>> actioned after running fine for a few seconds.
>>>>>>>>>
>>>>>>>>> The cuts were hard, as in no power not just roughness, and
>>>>>>>> only for a split second, but enough to get your attention.
>>>>>>>>>
>>>>>>>>> Speaking to two local CJ/Yak experts and they say it is
>>>>>>>> likely the 'mid-range' mixture adjustment (I think the CJ
>>>>>>>> book calls it 'cruise' mixture, same thing).
>>>>>>>>>
>>>>>>>>> Has anyone here experienced the same? Would be curious as
>>>>>>>> to what an earth is going on, intermittent failures are the
>>>>>>>> worst!
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>>>>> Read this topic online here:
>>>>>>>>>
>>>>>>>>> http://forums.matronics.com/viewtopic.php?p=442717#442717
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>>>>> http://www.matronics.com/Navig==========================p;
>>>>>>>> -===========================nbsp; -Matt Dralle, List
>>>>>>>> Admin.<=========================
>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>> ~,%4M4} r{ (8^a D K
>>>>>>>> j',.+- 5 h ,z^.+-
>>>>>>>> Tn+bp+r y'C { ,x(ZP >
>>>>>>>> -Zvkkj+ykym-&j',r5
>>>>>>>> h.+-i0fr(Z( jB0 8 Ia
>>>>>>>> T1$+y\{^j)ZnWayg +k&j',r
>>>>>>>> +k&j',rh*' gJ+^N *.~zw,h
>>>>>>>> jY^.+-
>>>>>>>> kym-&j',rr&*'i0fr((nb {
>>>>>>>> nr f
>>>>>>> *
>>>>>>>
>>>>>>> D============================================
>>>>>>> ist"">http://www.matronics.com/Navigator?Yak-List
>>>>>>> D============================================
>>>>>>> //forums.matronics.com <http://forums.matronics.com>
>>>>>>> D============================================
>>>>>>> ot;">http://www.matronics.com/contribution
>>>>>>> D============================================
>>>>>>>
>>>>>>> *
>>>>>> *
>>>>>>
>>>>>> href="http://www.matronics.com/Navigator?Yak-List">http://www.matronics.com/Navigator?Yak-List
>>>>>> href="http://forums.matronics.com/">http://forums.matronics.com
>>>>>> href="http://www.matronics.com/contribution">http://www.matronics.com/contribution
>>>>>>
>>>>>> *
>>>>>
>>>>> *
>>>>>
>>>>> D============================================
>>>>> ist"">http://www.matronics.com/Navigator?Yak-List
>>>>> D============================================
>>>>> //forums.matronics.com <http://forums.matronics.com>
>>>>> D============================================
>>>>> ot;">http://www.matronics.com/contribution
>>>>> D============================================
>>>>>
>>>>> *
>>>> *
>>>>
>>>> D============================================
>>>> ist"">http://www.matronics.com/Navigator?Yak-List
>>>> D============================================= <http://www.matronics.com/Navigator?Yak-ListD=============================================>
>>>> //forums.matronics.com <http://forums.matronics.com>
>>>> D============================================
>>>> ot;">http://www.matronics.com/contribution
>>>> D============================================= <http://www.matronics.com/contributionD=============================================>
>>>>
>>>> *
>>>
>>> *
>>>
>>> et="_blank">http://www.matronics.com/Navigator?Yak-List
>>> tp://forums.matronics.com
>>> _blank">http://www.matronics.com/contribution
>>>
>>> *
>>>
>>>
>>> *
>>>
>>>
>>> *
>
>
>
>
>
Message 16
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| Subject: | Re: Engine roughness, as in stops. starts. stops. starts. |
Say what?? Roger you are saying that the malfunctioning mag fires ALL 9
cylinders at the same time???
I could be wrong, it's happened before, but I think that is a physical
impossibility. Me thinks somebody is as full of S**t as the proverbial
Christmas goose.
Doug
On Fri, May 29, 2015 at 12:25 PM, Roger Kemp <f16viperdoc@me.com> wrote:
>
> Ps. Dan, it was Dennis and I that was working that problem on my 52 in
> 2003. The problem began less than 10 hours out of the container fresh fro
m
> Lithuanian overhaul. When the breaking down mag discharges it sends the
> charge to all the cylinders resulting in the supercharger fuel charge bei
ng
> burn in one giant backfire! It is an attention getter! The engine quits f
or
> a heartbeat the runs like shit on one mag... The bad one or it does not r
un
> at all when the bad mag is selected. The airborne mag check will sort tha
t
> out. So go buckle up your balls and go fly. 15 + or - 5 minutes later
> you'll have your answer. Like I said have the T shirt x3.
> You can get the T shirt too!
> Doc
>
> Sent from my iPad
>
> > On May 29, 2015, at 10:16 AM, A. Dennis Savarese <
> dsavarese0812@bellsouth.net> wrote:
> >
> dsavarese0812@bellsouth.net>
> >
> > Yes, it does Ernie. If you've never experienced a coil failure in one
> mag, I can tell you it WILL get your attention because if feels like the
> engine completely shuts down for one heartbeat, then picks back up again.
> >
> > I was told by someone with a lot more life experiences than me that
> another older radial (can't remember if it was one of the small
> Continental's like was used on the Stearmanor Wright or Pratt)the enginee
rs
> determined when the coil failed like being discussed here, the fuel charg
e
> through the supercharger (ie: fuel distribution point) is completely purg
ed
> for one heartbeat causing the sensation of a complete shutdown for a few
> millisecondsand then recharged and the engine picks back up. It's really
> weird. But I can tell you from many experiences, that's what it feels
> like. Maybe someone onthe list can better define why it feels like a
> complete shutdown for a heartbeat.
> >
> > FWIW, I have been able to duplicate the problem on the ground by heatin
g
> up the engine to above about 250 degrees C as read on the CHT. As Richard
> Goode has stated, it definitely is a heat problem with the coil which
> typically occurs in the first 20-30 minutes of the flight. Repeating it o
n
> the ground is more difficult. But it can be done. If you can get the coil
> hot enoughon the ground, the engine will start to misfire. Once THAT
> occurs, you can isolate the problem to the left or right mag with the mag
> switch.
> >
> > A. Dennis Savarese
> > 334-546-8182 (mobile)
> > www.yak-52.com
> > Skype - Yakguy1
> >
> >> On 5/29/2015 8:54 AM, Ernest Martinez wrote:
> >> Quick question.
> >>
> >> Wouldn't a coil problem only manifest itself on 1 side? A complete los
s
> of 1 Mag shouldn't cause an abrupt and complete loss of power should it?
> >>
> >> Ernie
> >>
> >> On Fri, May 29, 2015 at 9:43 AM, migfighter42 <migfighter42@gmail.com
> <mailto:migfighter42@gmail.com>> wrote:
> >>
> >> If its the fuel pump, you should see it on the fuel pressure gauge.
> >>
> >> if it is the valve train, that should be a problem noticed at all
> >> times, a loss of perforce irrespective of time and temperature.
> >>
> >> If it is always happening after a certain period of time in flight
> >> everytime, its coil related. We had this exact problem a year ago,
> >> took us forever to find it. Dennis and Jill finally got us on the
> >> right path.
> >>
> >> Good luck.
> >>
> >> Bill
> >>
> >>
> >>
> >> Sent from my T-Mobile 4G LTE Device
> >> -------- Original message --------
> >> From: Dan Payne <dantpayne@icloud.com <mailto:dantpayne@icloud.com>
>
> >> Date: 05/29/2015 12:28 AM (GMT-06:00)
> >> To: yak-list@matronics.com <mailto:yak-list@matronics.com>
> >> Subject: Re: Yak-List: Engine roughness, as in stops. starts.
> >> stops. starts.
> >>
> >> However..."engine cuts abruptly, goes, cuts again, goes. Mixture
> >> full rich, carb heat on, didn't do it again but then these items
> >> were actioned after running fine for a few seconds."
> >>
> >> If you went full rich, then turned on the carb heat (making the
> >> mixture even more rich) that's answers you own dilemma / question.
> >>
> >> Change the fuel pump
> >>
> >> Keep 'em Flyin',
> >>
> >> Dan Payne
> >> Owner, Pilot, A&P-IA
> >> (423)-544-8946 <tel:%28423%29-544-8946>
> >>
> >> Volunteer Aero Service
> >> Dallas Bay Skypark
> >> 1824 E Crabtree Road
> >> Hixson, TN 37343
> >>
> >> "Where Airworthiness Means Business!"
> >>
> >>
> >> On May 29, 2015, at 1:19 AM, Dan Payne <dantpayne@icloud.com
> >> <mailto:dantpayne@icloud.com>> wrote:
> >>
> >>> Ps....if you throw fuel to it mid-flight and it burst back to
> >>> life...I would suspect a worn out engine driven pump...
> >>>
> >>> Keep 'em Flyin',
> >>>
> >>> Dan Payne
> >>> Owner, Pilot, A&P-IA
> >>> (423)-544-8946 <tel:%28423%29-544-8946>
> >>>
> >>> Volunteer Aero
> >>> Dallas Bay Skypark
> >>> 1824 E Crabtree Road
> >>> Hixson, TN 37343
> >>>
> >>> "Where Airworthiness Means Business!"
> >>>
> >>>
> >>> On May 29, 2015, at 1:01 AM, Bill Geipel <l129bs@gmail.com
> >>> <mailto:l129bs@gmail.com>> wrote:
> >>>
> >>>> Adjust my what?? v-a-l-v-e-s? Like consonants?
> >>>>
> >>>> You do many annuals? You must be =9Crich"
> >>>>
> >>>> I=99m not =9Crich=9D, no nothing about radials,
why should I, we have
> >>>> guys like you that are willing to do it while we lounge by the
> >>>> pool, fly, camp, hike, bike, fly some more etc.
> >>>> So everyone gets what they want.
> >>>> I see your company name says =9CVolunteer=9D well, do
n=99t. Problem
> >>>> for you, solved.
> >>>> Shot mine, NOT bullet proof.
> >>>>
> >>>> Keep smiling.
> >>>>
> >>>> Bill Geipel
> >>>> Owner, pilot, not A&P-IA
> >>>> can=99t afford cell phone.
> >>>>
> >>>>
> >>>> On May 29, 2015, at 1:00 PM, Dan Payne <dantpayne@icloud.com
> >>>> <mailto:dantpayne@icloud.com>> wrote:
> >>>>
> >>>>> P.S.:
> >>>>>
> >>>>> Why don't you all adjust your valves??
> >>>>>
> >>>>> I do many annuals on "rich" people's airplanes who know nothing
> >>>>> about Radials....
> >>>>>
> >>>>> The engines are reliable. The airframes are bullet proof, and
> >>>>> Denis Savarese is your go to guy on 4th & 10!
> >>>>>
> >>>>> Keep 'em Flyin',
> >>>>>
> >>>>> Dan Payne
> >>>>> Owner, Pilot, A&P-IA
> >>>>> (423)-544-8946 <tel:%28423%29-544-8946>
> >>>>>
> >>>>> Volunteer Aero Services
> >>>>> Dallas Bay Skypark
> >>>>> 1824 E Crabtree Road
> >>>>> Hixson, TN 37343
> >>>>>
> >>>>> "Where Airworthiness Means Business!"
> >>>>>
> >>>>>
> >>>>> On May 28, 2015, at 11:46 PM, Dan Payne <dantpayne@icloud.com
> >>>>> <mailto:dantpayne@icloud.com>> wrote:
> >>>>>
> >>>>>> Adjust the points/ breaker felts on the mags...
> >>>>>>
> >>>>>>
> >>>>>> Let not forget the dwell timing / distributor advance in our
> >>>>>> GTOs we drove to high school...
> >>>>>>
> >>>>>> Keep 'em Flyin',
> >>>>>>
> >>>>>> Dan Payne
> >>>>>> Owner, Pilot, A&P-IA
> >>>>>> (423)-544-8946 <tel:%28423%29-544-8946>
> >>>>>>
> >>>>>> Volunteer Aero Service
> >>>>>> Dallas Bay Skypark
> >>>>>> 1824 E Crabtree Road
> >>>>>> Hixson, TN 37343
> >>>>>>
> >>>>>> "Where Airworthiness Means Business!"
> >>>>>>
> >>>>>>
> >>>>>> On May 28, 2015, at 11:03 PM, migfighter42
> >>>>>> <migfighter42@gmail.com <mailto:migfighter42@gmail.com>> wrote:
> >>>>>>
> >>>>>>> my experience with that problem is the same as Doc mentioned.
> >>>>>>> the aircraft would run fine until warmed up, normally in
> >>>>>>> flight, then dramatic misses. replaced the coils in the
> >>>>>>> magnetos, the problem went away.
> >>>>>>>
> >>>>>>> Bill
> >>>>>>>
> >>>>>>>
> >>>>>>>
> >>>>>>> Sent from my T-Mobile 4G LTE Device
> >>>>>>> -------- Original message --------
> >>>>>>> From: Roger Kemp <f16viperdoc@me.com
> >>>>>>> <mailto:f16viperdoc@me.com>>
> >>>>>>> Date: 05/28/2015 8:47 PM (GMT-06:00)
> >>>>>>> To: yak-list@matronics.com <mailto:yak-list@matronics.com>
> >>>>>>> Subject: Re: Yak-List: Engine roughness, as in stops. starts.
> >>>>>>> stops. starts.
> >>>>>>>
> >>>>>>> <f16viperdoc@me.com <mailto:f16viperdoc@me.com>>
> >>>>>>>
> >>>>>>> Mag coil going bad will also do that. Typically occurs about
> >>>>>>> 10 to 15 minutes of the flight.
> >>>>>>> Doc
> >>>>>>>
> >>>>>>> Sent from my iPad
> >>>>>>>
> >>>>>>> > On May 28, 2015, at 6:55 PM, JL2A
> >>>>>>> <info@flyingwarbirds.com.au
> >>>>>>> <mailto:info@flyingwarbirds.com.au>> wrote:
> >>>>>>> >
> >>>>>>> <info@flyingwarbirds.com.au <mailto:info@flyingwarbirds.com.au
> >>
> >>>>>>> >
> >>>>>>> > Hi all, my formation partner had a bit of engine trouble
> >>>>>>> last time we flew then I took the same plane up for a shake
> >>>>>>> down and got the same result -
> >>>>>>> >
> >>>>>>> > cruise power, 10 minutes into the flight, engine cuts
> >>>>>>> abruptly, goes, cuts again, goes. Mixture full rich, carb
> >>>>>>> heat on, didn't do it again but then these items were
> >>>>>>> actioned after running fine for a few seconds.
> >>>>>>> >
> >>>>>>> > The cuts were hard, as in no power not just roughness, and
> >>>>>>> only for a split second, but enough to get your attention.
> >>>>>>> >
> >>>>>>> > Speaking to two local CJ/Yak experts and they say it is
> >>>>>>> likely the 'mid-range' mixture adjustment (I think the CJ
> >>>>>>> book calls it 'cruise' mixture, same thing).
> >>>>>>> >
> >>>>>>> > Has anyone here experienced the same? Would be curious as
> >>>>>>> to what an earth is going on, intermittent failures are the
> >>>>>>> worst!
> >>>>>>> >
> >>>>>>> >
> >>>>>>> >
> >>>>>>> >
> >>>>>>> > Read this topic online here:
> >>>>>>> >
> >>>>>>> > http://forums.matronics.com/viewtopic.php?p=442717#442717
> >>>>>>> >
> >>>>>>> >
> >>>>>>> >
> >>>>>>> > http://www.matronics.com/Navig==========
================p;
> >>>>>>> -====================
=======nbsp; -Matt Dralle, List
> >>>>>>> Admin.<==================
=======
> >>>>>>>
> >>>>>>>
> >>>>>>>
> >>>>>>> =C2=C2=B7=BA~=B0=C3=AD=C2=B2,=C3=9E=C3=99=C3=8A
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> >>>>>>> =C5-=C3=8BT=C5=B8=C3=B4=C2=AEn=C3=87+=C5-=BAb=C2=A2p
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> >>>>>>> -=C2=A2=C3=88Z=C2=AD=C3=C2=A7vk=C5=93-k=C5=93
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> >>>>>>> =C3=A4T1$=C5=A1=84=A2=C3=A8+y=C2=AB\=C2=A2{^=C5=BE=C3'=C2
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=9A=C3=A8=C5=BE',r=B0=C2=A1=C2=B6=C3=9A
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> >>>>>>> =C2=B6=C3=90=C3=ABjY^.+- =C3=99=C2=A2
> >>>>>>> =C2=A8ky=C3=B8m=C2=B6=C5=B8=C3=C3=83 &j=C3=9A=C3=A8=C5=BE',
r=B0=C2r=B0=C3=AD=C2=AE&=C3=AE=C2=B6*'-=C3=9Bi=C3
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=9A=C3=A2n=C3=ABb=C2=A2 =C3=9A=C3=BD=C2=C3=9F=C2=A2{
> >>>>>>> =C2=C2=B7=C2n=A1r=C3=BE f
> >>>>>> *
> >>>>>>
> >>>>>>
> D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
=3D
> >>>>>> ist"">http://www.matronics.com/Navigator?Yak-List
> >>>>>>
> D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
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=3D
> >>>>>> //forums.matronics.com <http://forums.matronics.com>
> >>>>>>
> D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
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=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
=3D
> >>>>>> ot;">http://www.matronics.com/contribution
> >>>>>>
> D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
=3D
> >>>>>>
> >>>>>> *
> >>>>> *
> >>>>>
> >>>>> href="http://www.matronics.com/Navigator?Yak-List">
> http://www.matronics.com/Navigator?Yak-List
> >>>>> href="http://forums.matronics.com/">http://forums.matronics.co
m
> >>>>> href="http://www.matronics.com/contribution">
> http://www.matronics.com/contribution
> >>>>>
> >>>>> *
> >>>>
> >>>> *
> >>>>
> >>>>
> D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
=3D
> >>>> ist"">http://www.matronics.com/Navigator?Yak-List
> >>>>
> D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
=3D
> >>>> //forums.matronics.com <http://forums.matronics.com>
> >>>>
> D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
=3D
> >>>> ot;">http://www.matronics.com/contribution
> >>>>
> D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
=3D
> >>>>
> >>>> *
> >>> *
> >>>
> >>>
> D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
=3D
> >>> ist"">http://www.matronics.com/Navigator?Yak-List
> >>>
> D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
=3D
> <
> http://www.matronics.com/Navigator?Yak-ListD=3D=3D=3D=3D=3D=3
D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3
D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3
D=3D=3D=3D=3D=3D=3D=3D=3D=3D
> >
> >>> //forums.matronics.com <http://forums.matronics.com>
> >>>
> D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
=3D
> >>> ot;">http://www.matronics.com/contribution
> >>>
> D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
=3D
> <
> http://www.matronics.com/contributionD=3D=3D=3D=3D=3D=3D=3D
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
=3D=3D=3D=3D=3D=3D=3D=3D
> >
> >>>
> >>> *
> >>
> >> *
> >>
> >> et="_blank">http://www.matronics.com/Navigator?Yak-List
> >> tp://forums.matronics.com
> >> _blank">http://www.matronics.com/contribution
> >>
> >> *
> >>
> >>
> >> *
> >>
> >>
> >> *
> >
> >
> >
> >
> >
>
>
===========
===========
===========
===========
>
>
Message 17
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| Subject: | Re: Engine roughness, as in stops. starts. stops. starts. |
Hey, it was you in my pit when that shit happened headed up to Moontown!
Doc
Sent from my iPad
> On May 29, 2015, at 3:20 PM, Richard Hess <hess737@aol.com> wrote:
>
>
> Just tested an M-14P equipped Nanchang today and damn if this didn't happen.
You guys need to stop jinxing things!!!
>
> Richard Hess
> C 404-964-4885
>
>> On May 29, 2015, at 3:25 PM, Roger Kemp <f16viperdoc@me.com> wrote:
>>
>>
>> Ps. Dan, it was Dennis and I that was working that problem on my 52 in 2003.
The problem began less than 10 hours out of the container fresh from Lithuanian
overhaul. When the breaking down mag discharges it sends the charge to all
the cylinders resulting in the supercharger fuel charge being burn in one giant
backfire! It is an attention getter! The engine quits for a heartbeat the runs
like shit on one mag... The bad one or it does not run at all when the bad
mag is selected. The airborne mag check will sort that out. So go buckle up your
balls and go fly. 15 + or - 5 minutes later you'll have your answer. Like I
said have the T shirt x3.
>> You can get the T shirt too!
>> Doc
>>
>> Sent from my iPad
>>
>>> On May 29, 2015, at 10:16 AM, A. Dennis Savarese <dsavarese0812@bellsouth.net>
wrote:
>>>
>>>
>>> Yes, it does Ernie. If you've never experienced a coil failure in one mag,
I can tell you it WILL get your attention because if feels like the engine completely
shuts down for one heartbeat, then picks back up again.
>>>
>>> I was told by someone with a lot more life experiences than me that another
older radial (can't remember if it was one of the small Continental's like was
used on the Stearmanor Wright or Pratt)the engineers determined when the coil
failed like being discussed here, the fuel charge through the supercharger (ie:
fuel distribution point) is completely purged for one heartbeat causing the
sensation of a complete shutdown for a few millisecondsand then recharged and
the engine picks back up. It's really weird. But I can tell you from many experiences,
that's what it feels like. Maybe someone onthe list can better define
why it feels like a complete shutdown for a heartbeat.
>>>
>>> FWIW, I have been able to duplicate the problem on the ground by heating up
the engine to above about 250 degrees C as read on the CHT. As Richard Goode
has stated, it definitely is a heat problem with the coil which typically occurs
in the first 20-30 minutes of the flight. Repeating it on the ground is more
difficult. But it can be done. If you can get the coil hot enoughon the ground,
the engine will start to misfire. Once THAT occurs, you can isolate the problem
to the left or right mag with the mag switch.
>>>
>>> A. Dennis Savarese
>>> 334-546-8182 (mobile)
>>> www.yak-52.com
>>> Skype - Yakguy1
>>>
>>>> On 5/29/2015 8:54 AM, Ernest Martinez wrote:
>>>> Quick question.
>>>>
>>>> Wouldn't a coil problem only manifest itself on 1 side? A complete loss of
1 Mag shouldn't cause an abrupt and complete loss of power should it?
>>>>
>>>> Ernie
>>>>
>>>> On Fri, May 29, 2015 at 9:43 AM, migfighter42 <migfighter42@gmail.com <mailto:migfighter42@gmail.com>> wrote:
>>>>
>>>> If its the fuel pump, you should see it on the fuel pressure gauge.
>>>>
>>>> if it is the valve train, that should be a problem noticed at all
>>>> times, a loss of perforce irrespective of time and temperature.
>>>>
>>>> If it is always happening after a certain period of time in flight
>>>> everytime, its coil related. We had this exact problem a year ago,
>>>> took us forever to find it. Dennis and Jill finally got us on the
>>>> right path.
>>>>
>>>> Good luck.
>>>>
>>>> Bill
>>>>
>>>>
>>>>
>>>> Sent from my T-Mobile 4G LTE Device
>>>> -------- Original message --------
>>>> From: Dan Payne <dantpayne@icloud.com <mailto:dantpayne@icloud.com>>
>>>> Date: 05/29/2015 12:28 AM (GMT-06:00)
>>>> To: yak-list@matronics.com <mailto:yak-list@matronics.com>
>>>> Subject: Re: Yak-List: Engine roughness, as in stops. starts.
>>>> stops. starts.
>>>>
>>>> However..."engine cuts abruptly, goes, cuts again, goes. Mixture
>>>> full rich, carb heat on, didn't do it again but then these items
>>>> were actioned after running fine for a few seconds."
>>>>
>>>> If you went full rich, then turned on the carb heat (making the
>>>> mixture even more rich) that's answers you own dilemma / question.
>>>>
>>>> Change the fuel pump
>>>>
>>>> Keep 'em Flyin',
>>>>
>>>> Dan Payne
>>>> Owner, Pilot, A&P-IA
>>>> (423)-544-8946 <tel:%28423%29-544-8946>
>>>>
>>>> Volunteer Aero Service
>>>> Dallas Bay Skypark
>>>> 1824 E Crabtree Road
>>>> Hixson, TN 37343
>>>>
>>>> "Where Airworthiness Means Business!"
>>>>
>>>>
>>>> On May 29, 2015, at 1:19 AM, Dan Payne <dantpayne@icloud.com
>>>> <mailto:dantpayne@icloud.com>> wrote:
>>>>
>>>>> Ps....if you throw fuel to it mid-flight and it burst back to
>>>>> life...I would suspect a worn out engine driven pump...
>>>>>
>>>>> Keep 'em Flyin',
>>>>>
>>>>> Dan Payne
>>>>> Owner, Pilot, A&P-IA
>>>>> (423)-544-8946 <tel:%28423%29-544-8946>
>>>>>
>>>>> Volunteer Aero
>>>>> Dallas Bay Skypark
>>>>> 1824 E Crabtree Road
>>>>> Hixson, TN 37343
>>>>>
>>>>> "Where Airworthiness Means Business!"
>>>>>
>>>>>
>>>>> On May 29, 2015, at 1:01 AM, Bill Geipel <l129bs@gmail.com
>>>>> <mailto:l129bs@gmail.com>> wrote:
>>>>>
>>>>>> Adjust my what?? v-a-l-v-e-s? Like consonants?
>>>>>>
>>>>>> You do many annuals? You must be rich"
>>>>>>
>>>>>> Im not rich, no nothing about radials, why should I, we have
>>>>>> guys like you that are willing to do it while we lounge by the
>>>>>> pool, fly, camp, hike, bike, fly some more etc.
>>>>>> So everyone gets what they want.
>>>>>> I see your company name says Volunteer well, dont. Problem
>>>>>> for you, solved.
>>>>>> Shot mine, NOT bullet proof.
>>>>>>
>>>>>> Keep smiling.
>>>>>>
>>>>>> Bill Geipel
>>>>>> Owner, pilot, not A&P-IA
>>>>>> cant afford cell phone.
>>>>>>
>>>>>>
>>>>>> On May 29, 2015, at 1:00 PM, Dan Payne <dantpayne@icloud.com
>>>>>> <mailto:dantpayne@icloud.com>> wrote:
>>>>>>
>>>>>>> P.S.:
>>>>>>>
>>>>>>> Why don't you all adjust your valves??
>>>>>>>
>>>>>>> I do many annuals on "rich" people's airplanes who know nothing
>>>>>>> about Radials....
>>>>>>>
>>>>>>> The engines are reliable. The airframes are bullet proof, and
>>>>>>> Denis Savarese is your go to guy on 4th & 10!
>>>>>>>
>>>>>>> Keep 'em Flyin',
>>>>>>>
>>>>>>> Dan Payne
>>>>>>> Owner, Pilot, A&P-IA
>>>>>>> (423)-544-8946 <tel:%28423%29-544-8946>
>>>>>>>
>>>>>>> Volunteer Aero Services
>>>>>>> Dallas Bay Skypark
>>>>>>> 1824 E Crabtree Road
>>>>>>> Hixson, TN 37343
>>>>>>>
>>>>>>> "Where Airworthiness Means Business!"
>>>>>>>
>>>>>>>
>>>>>>> On May 28, 2015, at 11:46 PM, Dan Payne <dantpayne@icloud.com
>>>>>>> <mailto:dantpayne@icloud.com>> wrote:
>>>>>>>
>>>>>>>> Adjust the points/ breaker felts on the mags...
>>>>>>>>
>>>>>>>>
>>>>>>>> Let not forget the dwell timing / distributor advance in our
>>>>>>>> GTOs we drove to high school...
>>>>>>>>
>>>>>>>> Keep 'em Flyin',
>>>>>>>>
>>>>>>>> Dan Payne
>>>>>>>> Owner, Pilot, A&P-IA
>>>>>>>> (423)-544-8946 <tel:%28423%29-544-8946>
>>>>>>>>
>>>>>>>> Volunteer Aero Service
>>>>>>>> Dallas Bay Skypark
>>>>>>>> 1824 E Crabtree Road
>>>>>>>> Hixson, TN 37343
>>>>>>>>
>>>>>>>> "Where Airworthiness Means Business!"
>>>>>>>>
>>>>>>>>
>>>>>>>> On May 28, 2015, at 11:03 PM, migfighter42
>>>>>>>> <migfighter42@gmail.com <mailto:migfighter42@gmail.com>> wrote:
>>>>>>>>
>>>>>>>>> my experience with that problem is the same as Doc mentioned.
>>>>>>>>> the aircraft would run fine until warmed up, normally in
>>>>>>>>> flight, then dramatic misses. replaced the coils in the
>>>>>>>>> magnetos, the problem went away.
>>>>>>>>>
>>>>>>>>> Bill
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>>>>> Sent from my T-Mobile 4G LTE Device
>>>>>>>>> -------- Original message --------
>>>>>>>>> From: Roger Kemp <f16viperdoc@me.com
>>>>>>>>> <mailto:f16viperdoc@me.com>>
>>>>>>>>> Date: 05/28/2015 8:47 PM (GMT-06:00)
>>>>>>>>> To: yak-list@matronics.com <mailto:yak-list@matronics.com>
>>>>>>>>> Subject: Re: Yak-List: Engine roughness, as in stops. starts.
>>>>>>>>> stops. starts.
>>>>>>>>>
>>>>>>>>> <f16viperdoc@me.com <mailto:f16viperdoc@me.com>>
>>>>>>>>>
>>>>>>>>> Mag coil going bad will also do that. Typically occurs about
>>>>>>>>> 10 to 15 minutes of the flight.
>>>>>>>>> Doc
>>>>>>>>>
>>>>>>>>> Sent from my iPad
>>>>>>>>>
>>>>>>>>>> On May 28, 2015, at 6:55 PM, JL2A
>>>>>>>>> <info@flyingwarbirds.com.au
>>>>>>>>> <mailto:info@flyingwarbirds.com.au>> wrote:
>>>>>>>>>>
>>>>>>>>> <info@flyingwarbirds.com.au <mailto:info@flyingwarbirds.com.au>>
>>>>>>>>>>
>>>>>>>>>> Hi all, my formation partner had a bit of engine trouble
>>>>>>>>> last time we flew then I took the same plane up for a shake
>>>>>>>>> down and got the same result -
>>>>>>>>>>
>>>>>>>>>> cruise power, 10 minutes into the flight, engine cuts
>>>>>>>>> abruptly, goes, cuts again, goes. Mixture full rich, carb
>>>>>>>>> heat on, didn't do it again but then these items were
>>>>>>>>> actioned after running fine for a few seconds.
>>>>>>>>>>
>>>>>>>>>> The cuts were hard, as in no power not just roughness, and
>>>>>>>>> only for a split second, but enough to get your attention.
>>>>>>>>>>
>>>>>>>>>> Speaking to two local CJ/Yak experts and they say it is
>>>>>>>>> likely the 'mid-range' mixture adjustment (I think the CJ
>>>>>>>>> book calls it 'cruise' mixture, same thing).
>>>>>>>>>>
>>>>>>>>>> Has anyone here experienced the same? Would be curious as
>>>>>>>>> to what an earth is going on, intermittent failures are the
>>>>>>>>> worst!
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>> Read this topic online here:
>>>>>>>>>>
>>>>>>>>>> http://forums.matronics.com/viewtopic.php?p=442717#442717
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>> http://www.matronics.com/Navig==========================p;
>>>>>>>>> -===========================nbsp; -Matt Dralle, List
>>>>>>>>> Admin.<=========================
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>>>>> ~,%4M4} r{ (8^a D K
>>>>>>>>> j',.+- 5 h ,z^.+-
>>>>>>>>> Tn+bp+r y'C { ,x(ZP >
>>>>>>>>> -Zvkkj+ykym-&j',r5
>>>>>>>>> h.+-i0fr(Z( jB0 8 Ia
>>>>>>>>> T1$+y\{^j)ZnWayg +k&j',r
>>>>>>>>> +k&j',rh*' gJ+^N *.~zw,h
>>>>>>>>> jY^.+-
>>>>>>>>> kym-&j',rr&*'i0fr((nb {
>>>>>>>>> nr f
>>>>>>>> *
>>>>>>>>
>>>>>>>> D============================================
>>>>>>>> ist"">http://www.matronics.com/Navigator?Yak-List
>>>>>>>> D============================================
>>>>>>>> //forums.matronics.com <http://forums.matronics.com>
>>>>>>>> D============================================
>>>>>>>> ot;">http://www.matronics.com/contribution
>>>>>>>> D============================================
>>>>>>>>
>>>>>>>> *
>>>>>>> *
>>>>>>>
>>>>>>> href="http://www.matronics.com/Navigator?Yak-List">http://www.matronics.com/Navigator?Yak-List
>>>>>>> href="http://forums.matronics.com/">http://forums.matronics.com
>>>>>>> href="http://www.matronics.com/contribution">http://www.matronics.com/contribution
>>>>>>>
>>>>>>> *
>>>>>>
>>>>>> *
>>>>>>
>>>>>> D============================================
>>>>>> ist"">http://www.matronics.com/Navigator?Yak-List
>>>>>> D============================================
>>>>>> //forums.matronics.com <http://forums.matronics.com>
>>>>>> D============================================
>>>>>> ot;">http://www.matronics.com/contribution
>>>>>> D============================================
>>>>>>
>>>>>> *
>>>>> *
>>>>>
>>>>> D============================================
>>>>> ist"">http://www.matronics.com/Navigator?Yak-List
>>>>> D============================================= <http://www.matronics.com/Navigator?Yak-ListD=============================================>
>>>>> //forums.matronics.com <http://forums.matronics.com>
>>>>> D============================================
>>>>> ot;">http://www.matronics.com/contribution
>>>>> D============================================= <http://www.matronics.com/contributionD=============================================>
>>>>>
>>>>> *
>>>>
>>>> *
>>>>
>>>> et="_blank">http://www.matronics.com/Navigator?Yak-List
>>>> tp://forums.matronics.com
>>>> _blank">http://www.matronics.com/contribution
>>>>
>>>> *
>>>>
>>>>
>>>> *
>>>>
>>>>
>>>> *
>
>
>
>
>
Message 18
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|
| Subject: | Re: Engine roughness, as in stops. starts. stops. starts. |
Doug, the mag that was bad was the left mag (when sitting in the pit). The o
ne with the shower of sparks bypass circuit. The engineers in Lithuania are t
he ones that made that suggestion when we were trouble shooting. The CJ havi
ng centrifugal advance mags does not have a shower of sparks distributor cap
if I am not wrong.
Doc
Sent from my iPad
> On May 29, 2015, at 3:26 PM, doug sapp <dougsappllc@gmail.com> wrote:
>
> Say what?? Roger you are saying that the malfunctioning mag fires ALL 9 c
ylinders at the same time???
>
> I could be wrong, it's happened before, but I think that is a physical imp
ossibility. Me thinks somebody is as full of S**t as the proverbial Christm
as goose.
>
> Doug
>
>> On Fri, May 29, 2015 at 12:25 PM, Roger Kemp <f16viperdoc@me.com> wrote:
>>
>> Ps. Dan, it was Dennis and I that was working that problem on my 52 in 20
03. The problem began less than 10 hours out of the container fresh from Lit
huanian overhaul. When the breaking down mag discharges it sends the charge t
o all the cylinders resulting in the supercharger fuel charge being burn in o
ne giant backfire! It is an attention getter! The engine quits for a heartbe
at the runs like shit on one mag... The bad one or it does not run at all wh
en the bad mag is selected. The airborne mag check will sort that out. So go
buckle up your balls and go fly. 15 + or - 5 minutes later you'll have your
answer. Like I said have the T shirt x3.
>> You can get the T shirt too!
>> Doc
>>
>> Sent from my iPad
>>
>> > On May 29, 2015, at 10:16 AM, A. Dennis Savarese <dsavarese0812@bellsou
th.net> wrote:
>> >
lsouth.net>
>> >
>> > Yes, it does Ernie. If you've never experienced a coil failure in one m
ag, I can tell you it WILL get your attention because if feels like the engi
ne completely shuts down for one heartbeat, then picks back up again.
>> >
>> > I was told by someone with a lot more life experiences than me that ano
ther older radial (can't remember if it was one of the small Continental's l
ike was used on the Stearmanor Wright or Pratt)the engineers determined when
the coil failed like being discussed here, the fuel charge through the supe
rcharger (ie: fuel distribution point) is completely purged for one heartbea
t causing the sensation of a complete shutdown for a few millisecondsand the
n recharged and the engine picks back up. It's really weird. But I can tell
you from many experiences, that's what it feels like. Maybe someone onthe l
ist can better define why it feels like a complete shutdown for a heartbeat.
>> >
>> > FWIW, I have been able to duplicate the problem on the ground by heatin
g up the engine to above about 250 degrees C as read on the CHT. As Richard G
oode has stated, it definitely is a heat problem with the coil which typical
ly occurs in the first 20-30 minutes of the flight. Repeating it on the grou
nd is more difficult. But it can be done. If you can get the coil hot enough
on the ground, the engine will start to misfire. Once THAT occurs, you can i
solate the problem to the left or right mag with the mag switch.
>> >
>> > A. Dennis Savarese
>> > 334-546-8182 (mobile)
>> > www.yak-52.com
>> > Skype - Yakguy1
>> >
>> >> On 5/29/2015 8:54 AM, Ernest Martinez wrote:
>> >> Quick question.
>> >>
>> >> Wouldn't a coil problem only manifest itself on 1 side? A complete los
s of 1 Mag shouldn't cause an abrupt and complete loss of power should it?
>> >>
>> >> Ernie
>> >>
>> >> On Fri, May 29, 2015 at 9:43 AM, migfighter42 <migfighter42@gmail.com <
mailto:migfighter42@gmail.com>> wrote:
>> >>
>> >> If its the fuel pump, you should see it on the fuel pressure gauge.
>> >>
>> >> if it is the valve train, that should be a problem noticed at all
>> >> times, a loss of perforce irrespective of time and temperature.
>> >>
>> >> If it is always happening after a certain period of time in flight
>> >> everytime, its coil related. We had this exact problem a year ago,
>> >> took us forever to find it. Dennis and Jill finally got us on the
>> >> right path.
>> >>
>> >> Good luck.
>> >>
>> >> Bill
>> >>
>> >>
>> >>
>> >> Sent from my T-Mobile 4G LTE Device
>> >> -------- Original message --------
>> >> From: Dan Payne <dantpayne@icloud.com <mailto:dantpayne@icloud.com>
>
>> >> Date: 05/29/2015 12:28 AM (GMT-06:00)
>> >> To: yak-list@matronics.com <mailto:yak-list@matronics.com>
>> >> Subject: Re: Yak-List: Engine roughness, as in stops. starts.
>> >> stops. starts.
>> >>
>> >> However..."engine cuts abruptly, goes, cuts again, goes. Mixture
>> >> full rich, carb heat on, didn't do it again but then these items
>> >> were actioned after running fine for a few seconds."
>> >>
>> >> If you went full rich, then turned on the carb heat (making the
>> >> mixture even more rich) that's answers you own dilemma / question.
>> >>
>> >> Change the fuel pump
>> >>
>> >> Keep 'em Flyin',
>> >>
>> >> Dan Payne
>> >> Owner, Pilot, A&P-IA
>> >> (423)-544-8946 <tel:%28423%29-544-8946>
>> >>
>> >> Volunteer Aero Service
>> >> Dallas Bay Skypark
>> >> 1824 E Crabtree Road
>> >> Hixson, TN 37343
>> >>
>> >> "Where Airworthiness Means Business!"
>> >>
>> >>
>> >> On May 29, 2015, at 1:19 AM, Dan Payne <dantpayne@icloud.com
>> >> <mailto:dantpayne@icloud.com>> wrote:
>> >>
>> >>> Ps....if you throw fuel to it mid-flight and it burst back to
>> >>> life...I would suspect a worn out engine driven pump...
>> >>>
>> >>> Keep 'em Flyin',
>> >>>
>> >>> Dan Payne
>> >>> Owner, Pilot, A&P-IA
>> >>> (423)-544-8946 <tel:%28423%29-544-8946>
>> >>>
>> >>> Volunteer Aero
>> >>> Dallas Bay Skypark
>> >>> 1824 E Crabtree Road
>> >>> Hixson, TN 37343
>> >>>
>> >>> "Where Airworthiness Means Business!"
>> >>>
>> >>>
>> >>> On May 29, 2015, at 1:01 AM, Bill Geipel <l129bs@gmail.com
>> >>> <mailto:l129bs@gmail.com>> wrote:
>> >>>
>> >>>> Adjust my what?? v-a-l-v-e-s? Like consonants?
>> >>>>
>> >>>> You do many annuals? You must be =9Crich"
>> >>>>
>> >>>> I=99m not =9Crich=9D, no nothing about radials,
why should I, we have
>> >>>> guys like you that are willing to do it while we lounge by the
>> >>>> pool, fly, camp, hike, bike, fly some more etc.
>> >>>> So everyone gets what they want.
>> >>>> I see your company name says =9CVolunteer=9D well, do
n=99t. Problem
>> >>>> for you, solved.
>> >>>> Shot mine, NOT bullet proof.
>> >>>>
>> >>>> Keep smiling.
>> >>>>
>> >>>> Bill Geipel
>> >>>> Owner, pilot, not A&P-IA
>> >>>> can=99t afford cell phone.
>> >>>>
>> >>>>
>> >>>> On May 29, 2015, at 1:00 PM, Dan Payne <dantpayne@icloud.com
>> >>>> <mailto:dantpayne@icloud.com>> wrote:
>> >>>>
>> >>>>> P.S.:
>> >>>>>
>> >>>>> Why don't you all adjust your valves??
>> >>>>>
>> >>>>> I do many annuals on "rich" people's airplanes who know nothing
>> >>>>> about Radials....
>> >>>>>
>> >>>>> The engines are reliable. The airframes are bullet proof, and
>> >>>>> Denis Savarese is your go to guy on 4th & 10!
>> >>>>>
>> >>>>> Keep 'em Flyin',
>> >>>>>
>> >>>>> Dan Payne
>> >>>>> Owner, Pilot, A&P-IA
>> >>>>> (423)-544-8946 <tel:%28423%29-544-8946>
>> >>>>>
>> >>>>> Volunteer Aero Services
>> >>>>> Dallas Bay Skypark
>> >>>>> 1824 E Crabtree Road
>> >>>>> Hixson, TN 37343
>> >>>>>
>> >>>>> "Where Airworthiness Means Business!"
>> >>>>>
>> >>>>>
>> >>>>> On May 28, 2015, at 11:46 PM, Dan Payne <dantpayne@icloud.com
>> >>>>> <mailto:dantpayne@icloud.com>> wrote:
>> >>>>>
>> >>>>>> Adjust the points/ breaker felts on the mags...
>> >>>>>>
>> >>>>>>
>> >>>>>> Let not forget the dwell timing / distributor advance in our
>> >>>>>> GTOs we drove to high school...
>> >>>>>>
>> >>>>>> Keep 'em Flyin',
>> >>>>>>
>> >>>>>> Dan Payne
>> >>>>>> Owner, Pilot, A&P-IA
>> >>>>>> (423)-544-8946 <tel:%28423%29-544-8946>
>> >>>>>>
>> >>>>>> Volunteer Aero Service
>> >>>>>> Dallas Bay Skypark
>> >>>>>> 1824 E Crabtree Road
>> >>>>>> Hixson, TN 37343
>> >>>>>>
>> >>>>>> "Where Airworthiness Means Business!"
>> >>>>>>
>> >>>>>>
>> >>>>>> On May 28, 2015, at 11:03 PM, migfighter42
>> >>>>>> <migfighter42@gmail.com <mailto:migfighter42@gmail.com>> wrote:
>> >>>>>>
>> >>>>>>> my experience with that problem is the same as Doc mentioned.
>> >>>>>>> the aircraft would run fine until warmed up, normally in
>> >>>>>>> flight, then dramatic misses. replaced the coils in the
>> >>>>>>> magnetos, the problem went away.
>> >>>>>>>
>> >>>>>>> Bill
>> >>>>>>>
>> >>>>>>>
>> >>>>>>>
>> >>>>>>> Sent from my T-Mobile 4G LTE Device
>> >>>>>>> -------- Original message --------
>> >>>>>>> From: Roger Kemp <f16viperdoc@me.com
>> >>>>>>> <mailto:f16viperdoc@me.com>>
>> >>>>>>> Date: 05/28/2015 8:47 PM (GMT-06:00)
>> >>>>>>> To: yak-list@matronics.com <mailto:yak-list@matronics.com>
>> >>>>>>> Subject: Re: Yak-List: Engine roughness, as in stops. starts.
>> >>>>>>> stops. starts.
>> >>>>>>>
>> >>>>>>> <f16viperdoc@me.com <mailto:f16viperdoc@me.com>>
>> >>>>>>>
>> >>>>>>> Mag coil going bad will also do that. Typically occurs about
>> >>>>>>> 10 to 15 minutes of the flight.
>> >>>>>>> Doc
>> >>>>>>>
>> >>>>>>> Sent from my iPad
>> >>>>>>>
>> >>>>>>> > On May 28, 2015, at 6:55 PM, JL2A
>> >>>>>>> <info@flyingwarbirds.com.au
>> >>>>>>> <mailto:info@flyingwarbirds.com.au>> wrote:
>> >>>>>>> >
>> >>>>>>> <info@flyingwarbirds.com.au <mailto:info@flyingwarbirds.com.au
>>
>> >>>>>>> >
>> >>>>>>> > Hi all, my formation partner had a bit of engine trouble
>> >>>>>>> last time we flew then I took the same plane up for a shake
>> >>>>>>> down and got the same result -
>> >>>>>>> >
>> >>>>>>> > cruise power, 10 minutes into the flight, engine cuts
>> >>>>>>> abruptly, goes, cuts again, goes. Mixture full rich, carb
>> >>>>>>> heat on, didn't do it again but then these items were
>> >>>>>>> actioned after running fine for a few seconds.
>> >>>>>>> >
>> >>>>>>> > The cuts were hard, as in no power not just roughness, and
>> >>>>>>> only for a split second, but enough to get your attention.
>> >>>>>>> >
>> >>>>>>> > Speaking to two local CJ/Yak experts and they say it is
>> >>>>>>> likely the 'mid-range' mixture adjustment (I think the CJ
>> >>>>>>> book calls it 'cruise' mixture, same thing).
>> >>>>>>> >
>> >>>>>>> > Has anyone here experienced the same? Would be curious as
>> >>>>>>> to what an earth is going on, intermittent failures are the
>> >>>>>>> worst!
>> >>>>>>> >
>> >>>>>>> >
>> >>>>>>> >
>> >>>>>>> >
>> >>>>>>> > Read this topic online here:
>> >>>>>>> >
>> >>>>>>> > http://forums.matronics.com/viewtopic.php?p=442717#442717
>> >>>>>>> >
>> >>>>>>> >
>> >>>>>>> >
>> >>>>>>> > http://www.matronics.com/Navig==========
================p;
>> >>>>>>> -=====================
======nbsp; -Matt Dralle, List
>> >>>>>>> Admin.<===================
======
>> >>>>>>>
>> >>>>>>>
>> >>>>>>>
>> >>>>>>> =C2=C2=B7=BA~=B0=C3=AD=C2=B2,=C3=9E=C3=99=C3=8A
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>> >>>>>>> =C2=B6=C3=90=C3=ABjY^.+- =C3=99=C2=A2
>> >>>>>>> =C2=A8ky=C3=B8m=C2=B6=C5=B8=C3=C3=83=0C&j=C3=9A=C3=A8=C5=BE
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>> >>>>>>> =C2=C2=B7=C2n=A1r=C3=BE f
>> >>>>>> *
>> >>>>>>
>> >>>>>> D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
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>> >>>>>> ist"">http://www.matronics.com/Navigator?Yak-List
>> >>>>>> D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3
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=3D=3D
>> >>>>>> //forums.matronics.com <http://forums.matronics.com>
>> >>>>>> D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3
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>> >>>>>> ot;">http://www.matronics.com/contribution
>> >>>>>> D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
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=3D=3D
>> >>>>>>
>> >>>>>> *
>> >>>>> *
>> >>>>>
>> >>>>> href="http://www.matronics.com/Navigator?Yak-List">http://www.
matronics.com/Navigator?Yak-List
>> >>>>> href="http://forums.matronics.com/">http://forums.matronics.co
m
>> >>>>> href="http://www.matronics.com/contribution">http://www.matron
ics.com/contribution
>> >>>>>
>> >>>>> *
>> >>>>
>> >>>> *
>> >>>>
>> >>>> D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3
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>> >>>> ist"">http://www.matronics.com/Navigator?Yak-List
>> >>>> D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3
D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
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3D=3D
>> >>>> //forums.matronics.com <http://forums.matronics.com>
>> >>>> D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3
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>> >>>> ot;">http://www.matronics.com/contribution
>> >>>> D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3
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3D=3D
>> >>>>
>> >>>> *
>> >>> *
>> >>>
>> >>> D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
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>> >>> ist"">http://www.matronics.com/Navigator?Yak-List
>> >>> D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
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>> >>> //forums.matronics.com <http://forums.matronics.com>
>> >>> D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
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>> >>> ot;">http://www.matronics.com/contribution
>> >>> D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
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>> >>>
>> >>> *
>> >>
>> >> *
>> >>
>> >> et="_blank">http://www.matronics.com/Navigator?Yak-List
>> >> tp://forums.matronics.com
>> >> _blank">http://www.matronics.com/contribution
>> >>
>> >> *
>> >>
>> >>
>> >> *
>> >>
>> >>
>> >> *
>> >
>> >
>> >
>> >
>> >
>>
>>
>> ==========
>> List" target="_blank">http://www.matronics.com/Navigator?Yak-List
>> ==========
>> FORUMS -
>> _blank">http://forums.matronics.com
>> ==========
>> b Site -
>> -Matt Dralle, List Admin.
>> target="_blank">http://www.matronics.com/contribution
>> ==========
>>
>>
>>
>
>
>
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D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
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D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3
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=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
>
Message 19
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| Subject: | Re: Engine roughness, as in stops. starts. stops. starts. |
Yes it was. That's why I remember it well!!!
Richard Hess
President
International Jets, Inc.
Cell 404-964-4885
-----Original Message-----
From: Roger Kemp <f16viperdoc@me.com>
Sent: Fri, May 29, 2015 7:52 pm
Subject: Re: Yak-List: Engine roughness, as in stops. starts. stops. starts
.
Hey, it was
you in my pit when that shit happened headed up to Moontown!
Doc
Sent from
my iPad
> On May 29, 2015, at 3:20 PM, Richard Hess <hess737@aol.com>
wrote:
>
>
> Just tested an M-14P equipped Nanchang today and damn if this didn't happ
en.
You guys need to stop jinxing things!!!
>
> Richard Hess
> C 404-964-4885
>
>> On May 29, 2015, at 3:25 PM, Roger Kemp <f16viperdoc@me.com> wrote:
>>
>>
>>
Ps. Dan, it was Dennis and I that was working that problem on my 52 in 2003
. The
problem began less than 10 hours out of the container fresh from Lithuanian
overhaul. When the breaking down mag discharges it sends the charge to all
the
cylinders resulting in the supercharger fuel charge being burn in one giant
backfire! It is an attention getter! The engine quits for a heartbeat the r
uns
like shit on one mag... The bad one or it does not run at all when the bad
mag
is selected. The airborne mag check will sort that out. So go buckle up you
r
balls and go fly. 15 + or - 5 minutes later you'll have your answer. Like I
said
have the T shirt x3.
>> You can get the T shirt too!
>> Doc
>>
>> Sent
from my iPad
>>
>>> On May 29, 2015, at 10:16 AM, A. Dennis Savarese
<dsavarese0812@bellsouth.net> wrote:
>>>
"A. Dennis Savarese" <dsavarese0812@bellsouth.net>
>>>
>>> Yes, it does
Ernie. If you've never experienced a coil failure in one mag, I can tell y
ou it
WILL get your attention because if feels like the engine completely shuts d
own
for one heartbeat, then picks back up again.
>>>
>>> I was told by someone
with a lot more life experiences than me that another older radial (can't
remember if it was one of the small Continental's like was used on the
Stearmanor Wright or Pratt)the engineers determined when the coil failed li
ke
being discussed here, the fuel charge through the supercharger (ie: fuel
distribution point) is completely purged for one heartbeat causing the sens
ation
of a complete shutdown for a few millisecondsand then recharged and the eng
ine
picks back up. It's really weird. But I can tell you from many experiences
,
that's what it feels like. Maybe someone onthe list can better define why
it
feels like a complete shutdown for a heartbeat.
>>>
>>> FWIW, I have been
able to duplicate the problem on the ground by heating up the engine to abo
ve
about 250 degrees C as read on the CHT. As Richard Goode has stated, it
definitely is a heat problem with the coil which typically occurs in the fi
rst
20-30 minutes of the flight. Repeating it on the ground is more difficult.
But
it can be done. If you can get the coil hot enoughon the ground, the engine
will
start to misfire. Once THAT occurs, you can isolate the problem to the left
or
right mag with the mag switch.
>>>
>>> A. Dennis Savarese
>>> 334-546-8182
(mobile)
>>> www.yak-52.com
>>> Skype - Yakguy1
>>>
>>>> On 5/29/2015 8:54
AM, Ernest Martinez wrote:
>>>> Quick question.
>>>>
>>>> Wouldn't a coil
problem only manifest itself on 1 side? A complete loss of 1 Mag shouldn't
cause
an abrupt and complete loss of power should it?
>>>>
>>>> Ernie
>>>>
>>>>
On Fri, May 29, 2015 at 9:43 AM, migfighter42 <migfighter42@gmail.com
<mailto:migfighter42@gmail.com>> wrote:
>>>>
>>>> If its the fuel pump, you
should see it on the fuel pressure gauge.
>>>>
>>>> if it is the valve
train, that should be a problem noticed at all
>>>> times, a loss of perforce
irrespective of time and temperature.
>>>>
>>>> If it is always happening
after a certain period of time in flight
>>>> everytime, its coil related. We
had this exact problem a year ago,
>>>> took us forever to find it. Dennis and
Jill finally got us on the
>>>> right path.
>>>>
>>>> Good luck.
>>>>
>>>> Bill
>>>>
>>>>
>>>>
>>>> Sent from my T-Mobile 4G LTE
Device
>>>> -------- Original message --------
>>>> From: Dan Payne
<dantpayne@icloud.com <mailto:dantpayne@icloud.com>>
>>>> Date: 05/29/2015
12:28 AM (GMT-06:00)
>>>> To: yak-list@matronics.com
<mailto:yak-list@matronics.com>
>>>> Subject: Re: Yak-List: Engine roughness,
as in stops. starts.
>>>> stops. starts.
>>>>
>>>> However..."engine cuts
abruptly, goes, cuts again, goes. Mixture
>>>> full rich, carb heat on, didn't
do it again but then these items
>>>> were actioned after running fine for a
few seconds."
>>>>
>>>> If you went full rich, then turned on the carb heat
(making the
>>>> mixture even more rich) that's answers you own dilemma /
question.
>>>>
>>>> Change the fuel pump
>>>>
>>>> Keep 'em
Flyin',
>>>>
>>>> Dan Payne
>>>> Owner, Pilot, A&P-IA
>>>>
(423)-544-8946 <tel:%28423%29-544-8946>
>>>>
>>>> Volunteer Aero
Service
>>>> Dallas Bay Skypark
>>>> 1824 E Crabtree Road
>>>> Hixson, TN
37343
>>>>
>>>> "Where Airworthiness Means Business!"
>>>>
>>>>
>>>>
On May 29, 2015, at 1:19 AM, Dan Payne <dantpayne@icloud.com
>>>>
<mailto:dantpayne@icloud.com>> wrote:
>>>>
>>>>> Ps....if you throw fuel to
it mid-flight and it burst back to
>>>>> life...I would suspect a worn out
engine driven pump...
>>>>>
>>>>> Keep 'em Flyin',
>>>>>
>>>>> Dan
Payne
>>>>> Owner, Pilot, A&P-IA
>>>>> (423)-544-8946
<tel:%28423%29-544-8946>
>>>>>
>>>>> Volunteer Aero
>>>>> Dallas Bay
Skypark
>>>>> 1824 E Crabtree Road
>>>>> Hixson, TN 37343
>>>>>
>>>>>
"Where Airworthiness Means Business!"
>>>>>
>>>>>
>>>>> On May 29, 2015,
at 1:01 AM, Bill Geipel <l129bs@gmail.com
>>>>> <mailto:l129bs@gmail.com>>
wrote:
>>>>>
>>>>>> Adjust my what?? v-a-l-v-e-s? Like consonants?
>>>>>>
>>>>>> You do many annuals? You must be =9Crich"
>>>>>>
>>>>>> I=99m not
=9Crich=9D, no nothing about radials, why should I, we have
>>>>>> guys like you
that are willing to do it while we lounge by the
>>>>>> pool, fly, camp, hike,
bike, fly some more etc.
>>>>>> So everyone gets what they want.
>>>>>> I
see your company name says =9CVolunteer=9D well, don=99t.
Problem
>>>>>> for you,
solved.
>>>>>> Shot mine, NOT bullet proof.
>>>>>>
>>>>>> Keep
smiling.
>>>>>>
>>>>>> Bill Geipel
>>>>>> Owner, pilot, not A&P-IA
>>>>>>
can=99t afford cell phone.
>>>>>>
>>>>>>
>>>>>> On May 29, 2015, at 1:00 PM,
Dan Payne <dantpayne@icloud.com
>>>>>> <mailto:dantpayne@icloud.com>>
wrote:
>>>>>>
>>>>>>> P.S.:
>>>>>>>
>>>>>>> Why don't you all adjust
your valves??
>>>>>>>
>>>>>>> I do many annuals on "rich" people's airplanes
who know nothing
>>>>>>> about Radials....
>>>>>>>
>>>>>>> The engines are
reliable. The airframes are bullet proof, and
>>>>>>> Denis Savarese is your
go to guy on 4th & 10!
>>>>>>>
>>>>>>> Keep 'em Flyin',
>>>>>>>
>>>>>>>
Dan Payne
>>>>>>> Owner, Pilot, A&P-IA
>>>>>>> (423)-544-8946
<tel:%28423%29-544-8946>
>>>>>>>
>>>>>>> Volunteer Aero Services
>>>>>>>
Dallas Bay Skypark
>>>>>>> 1824 E Crabtree Road
>>>>>>> Hixson, TN
37343
>>>>>>>
>>>>>>> "Where Airworthiness Means Business!"
>>>>>>>
>>>>>>>
>>>>>>> On May 28, 2015, at 11:46 PM, Dan Payne
<dantpayne@icloud.com
>>>>>>> <mailto:dantpayne@icloud.com>> wrote:
>>>>>>>
>>>>>>>> Adjust the points/ breaker felts on the mags...
>>>>>>>>
>>>>>>>>
>>>>>>>> Let not forget the dwell timing / distributor advance in
our
>>>>>>>> GTOs we drove to high school...
>>>>>>>>
>>>>>>>> Keep 'em
Flyin',
>>>>>>>>
>>>>>>>> Dan Payne
>>>>>>>> Owner, Pilot,
A&P-IA
>>>>>>>> (423)-544-8946 <tel:%28423%29-544-8946>
>>>>>>>>
>>>>>>>>
Volunteer Aero Service
>>>>>>>> Dallas Bay Skypark
>>>>>>>> 1824 E Crabtree
Road
>>>>>>>> Hixson, TN 37343
>>>>>>>>
>>>>>>>> "Where Airworthiness
Means Business!"
>>>>>>>>
>>>>>>>>
>>>>>>>> On May 28, 2015, at 11:03 PM,
migfighter42
>>>>>>>> <migfighter42@gmail.com <mailto:migfighter42@gmail.com>>
wrote:
>>>>>>>>
>>>>>>>>> my experience with that problem is the same as Doc
mentioned.
>>>>>>>>> the aircraft would run fine until warmed up, normally
in
>>>>>>>>> flight, then dramatic misses. replaced the coils in
the
>>>>>>>>> magnetos, the problem went away.
>>>>>>>>>
>>>>>>>>>
Bill
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>>>>> Sent from my T-Mobile 4G
LTE Device
>>>>>>>>> -------- Original message --------
>>>>>>>>> From:
Roger Kemp <f16viperdoc@me.com
>>>>>>>>>
<mailto:f16viperdoc@me.com>>
>>>>>>>>> Date: 05/28/2015 8:47 PM
(GMT-06:00)
>>>>>>>>> To: yak-list@matronics.com
<mailto:yak-list@matronics.com>
>>>>>>>>> Subject: Re: Yak-List: Engine
roughness, as in stops. starts.
>>>>>>>>> stops. starts.
>>>>>>>>>
>>>>>>>>>
<f16viperdoc@me.com <mailto:f16viperdoc@me.com>>
>>>>>>>>>
>>>>>>>>> Mag
coil going bad will also do that. Typically occurs about
>>>>>>>>> 10 to 15
minutes of the flight.
>>>>>>>>> Doc
>>>>>>>>>
>>>>>>>>> Sent from my
iPad
>>>>>>>>>
>>>>>>>>>> On May 28, 2015, at 6:55 PM, JL2A
>>>>>>>>>
<info@flyingwarbirds.com.au
>>>>>>>>> <mailto:info@flyingwarbirds.com.au>>
wrote:
>>>>>>>>>>
"JL2A"
>>>>>>>>> <info@flyingwarbirds.com.au
<mailto:info@flyingwarbirds.com.au>>
>>>>>>>>>>
>>>>>>>>>> Hi all, my
formation partner had a bit of engine trouble
>>>>>>>>> last time we flew then
I took the same plane up for a shake
>>>>>>>>> down and got the same result
-
>>>>>>>>>>
>>>>>>>>>> cruise power, 10 minutes into the flight, engine
cuts
>>>>>>>>> abruptly, goes, cuts again, goes. Mixture full rich,
carb
>>>>>>>>> heat on, didn't do it again but then these items
were
>>>>>>>>> actioned after running fine for a few seconds.
>>>>>>>>>>
>>>>>>>>>> The cuts were hard, as in no power not just roughness,
and
>>>>>>>>> only for a split second, but enough to get your
attention.
>>>>>>>>>>
>>>>>>>>>> Speaking to two local CJ/Yak experts and
they say it is
>>>>>>>>> likely the 'mid-range' mixture adjustment (I think
the CJ
>>>>>>>>> book calls it 'cruise' mixture, same thing).
>>>>>>>>>>
>>>>>>>>>> Has anyone here experienced the same? Would be curious
as
>>>>>>>>> to what an earth is going on, intermittent failures are
the
>>>>>>>>> worst!
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>> Read this topic online here:
>>>>>>>>>>
>>>>>>>>>>
http://forums.matronics.com/viewtopic.php?p=442717#442717
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>>
http://www.matronics.com/Navig===============
===========p;
>>>>>>>>>
-========================
===nbsp; -Matt Dralle, List
>>>>>>>>>
Admin.<======================
===
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
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>>>>>>>>
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>>>>>>>>
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>>>>>>>>
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>>>>>>>>
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>>>>>>> *
>>>>>>>
>>>>>>>
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om/Navigator?Yak-List
>>>>>>>
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>>>>>>>
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>>>>>>>
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>>>>>>
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>>>>>>
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>>>>>
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>>>>>
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>>>>>
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>>>>
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>>>>
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>>>>
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>>>>
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>>>>
>>>> *
>>>>
>>>>
>>>> *
>>>>
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>>>> *
>
>
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