Today's Message Index:
----------------------
1. 05:39 AM - Re: Accelerator jet modification (Andy Hawes)
2. 07:25 AM - Re: Accelerator jet modification (A. Dennis Savarese)
3. 12:16 PM - Re: Oil, again (Francois Davel)
4. 12:43 PM - Compression (Hans Oortman)
5. 01:22 PM - Re: Compression (Didier Blouzard)
6. 01:22 PM - Re: Re: Oil, again (Didier Blouzard)
7. 01:50 PM - Re: Compression (T A LEWIS)
8. 01:58 PM - Re: Compression (Hans Oortman)
9. 01:59 PM - Re: compression (Frank Stelwagon)
10. 02:07 PM - Re: Compression (Didier Blouzard)
11. 03:02 PM - Re: Compression (T A LEWIS)
12. 03:08 PM - Re: Re: Oil, again (Eric Wobschall)
13. 05:06 PM - Re:Magneto Drop (Frank Stelwagon)
14. 05:09 PM - Re: Compression (Yak Pilot)
15. 05:13 PM - Re: Accelerator jet modification (Yak Pilot)
16. 07:11 PM - Re: Compression (cjpilot710@aol.com)
Message 1
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| Subject: | Re: Accelerator jet modification |
Thank you, I'll keep that in mind.
On 9/3/10 12:16 PM, "Bitterlich, Mark G CIV Det Cherry Point, MALS-14 64E"
<mark.bitterlich@navy.mil> wrote:
> MALS-14 64E" <mark.bitterlich@navy.mil>
>
>
> Just a heads up. Not ALL M-14P's have this hesitation problem. For
> example... Mine does not! The problem is fairly common on the 400
> horsepower PF model... But a lot of M-14P (360 horsepower) work just
> fine without modifying the carb and for that matter, so do some
> M-14PF's!
>
> This is a TUNING change to the carb. The pressure carb used in the M-14
> has a lot of jets that can be changed to make the engine perform as it
> should. The jet being changed here impacts the way the engine reacts
> when you MOVE the throttle. It does not impact the amount of fuel the
> engine is receiving when it is just "running" normally, with your hand
> off the throttle. As such changing this jet should not impact normal
> running "fuel to air ratio", ... Thus it does not impact cylinder head
> temps.
>
> But it is not a change that you should just put into your engine just
> because someone else did. If you are experiencing problems where when
> you ADD POWER to the engine, it HESITATES and kind of "thinks about it
> for a split second" and THEN kind of catches up with a surge of power,
> then this would be a good thing to try in order to correct that
> particular problem.
>
> On the other hand, if your engine reacts properly when you add throttle,
> with a smooth and immediate change in power... Just like when you push
> down on the gas pedal in your car, then DO NOT MESS WITH THIS AT ALL!
>
> Just saying.... :-)
>
> Mark Bitterlich
>
>
>
>
>
> -----Original Message-----
> From: owner-yak-list-server@matronics.com
> [mailto:owner-yak-list-server@matronics.com] On Behalf Of Andy Hawes
> Sent: Friday, September 03, 2010 12:59
> To: yak-list@matronics.com
> Subject: Re: Yak-List: Accelerator jet modification
>
> I am actually getting fairly close to pulling out my M14 and was
> thinking this might be a good time to do this modification. Does Dennis
> or anyone have any documentation that might take me through this step by
> step? I have 0 time working on this engine, so if you guys think this
> is too technical, I'll hold off.
>
> It would be nice to not have to go through the "hesitancy" learning
> curve --
>
> Thank you,
>
>
> Andy Hawes
> Radial Rocket
> Nashville, TN
>
>
>
>
> On 9/3/10 10:10 AM, "Eric Wobschall" <eric@buffaloskyline.com> wrote:
>
>
>
> thx
>
>
> On Sep 3, 2010, at 11:00 AM, Steven Johnson wrote:
>
>
>
> He just switched the two jets. The sizes were hard to
> read but I think one indicated 1.0mm and the other 0.6mm.
>
> Steve Johnson
> Yak 52 N9900X 0B5
> 413 522-1130 Cell
>
> From: owner-yak-list-server@matronics.com
> [mailto:owner-yak-list-server@matronics.com] On Behalf Of Eric Wobschall
> Sent: Friday, September 03, 2010 10:55 AM
> To: yak-list@matronics.com
> Subject: Re: Yak-List: Accelerator jet modification
>
> Which size jets did you use?
>
>
> On Sep 3, 2010, at 10:50 AM, Steven Johnson wrote:
>
>
> I did not observe any change in CHT. My engine is
> running better than before, although Dennis also found a couple of loose
> intake gland nuts and tightened them at the same time he switched the
> jets in the carb. It is really nice to push the throttle forward and
> feel an immediate surge in power.
>
> Steve Johnson
> Yak 52 N9900X 0B5
> 413 522-1130 Cell
>
> From: owner-yak-list-server@matronics.com
> [mailto:owner-yak-list-server@matronics.com] On Behalf Of Eric Wobschall
> Sent: Friday, September 03, 2010 10:32 AM
> To: yak-list@matronics.com
> Subject: Re: Yak-List: Accelerator jet modification
>
> Steve:
>
> Have you noticed any difference in CHT?
>
> -Eric
>
>
> On Sep 3, 2010, at 10:22 AM, Steven Johnson wrote:
>
>
>
> I recently had Dennis Savarese swap the two accelerator
> jets on the carburetor of my M14P. This totally eliminated all
> hesitation when adding power on final. It is an easy modification that
> takes about an hour. The carb is a little difficult to reach but the
> time spent is well worth it. He merely switched the two jets with each
> other, no new parts needed. Thanks Dennis.
>
> Steve Johnson
> Yak 52 N9900X 0B5
> 413 522-1130 Cell
>
>
>
>
>
>
>
Message 2
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| Subject: | Re: Accelerator jet modification |
Re: Yak-List: Accelerator jet modificationAndy,
As Mark says, first see if the engine hesitates. Then if you need to
make the modification, contact me off-list at
dsavarese0812@bellsouth.net and I will put something together for you.
FWIW, this was not my creation. It came from the Termikas engine shop
whom I have great respect for. We were discussing the old way of
fixing the problem by plugging the accelerator pump jet. Termikas'
engine shop came up with the "fix" and tested it on their engines, which
is the mod which I made on Steve's 52 (and several others including my
personal Yak52 before I sold it).
Dennis
----- Original Message -----
From: Andy Hawes
To: yak-list@matronics.com
Sent: Friday, September 03, 2010 11:59 AM
Subject: Re: Yak-List: Accelerator jet modification
I am actually getting fairly close to pulling out my M14 and was
thinking this might be a good time to do this modification. Does Dennis
or anyone have any documentation that might take me through this step by
step? I have 0 time working on this engine, so if you guys think this
is too technical, I=92ll hold off.
It would be nice to not have to go through the =93hesitancy=94
learning curve --
Thank you,
Andy Hawes
Radial Rocket
Nashville, TN
On 9/3/10 10:10 AM, "Eric Wobschall" <eric@buffaloskyline.com> wrote:
thx
On Sep 3, 2010, at 11:00 AM, Steven Johnson wrote:
He just switched the two jets. The sizes were hard to read but I
think one indicated 1.0mm and the other 0.6mm.
Steve Johnson
Yak 52 N9900X 0B5
413 522-1130 Cell
From: owner-yak-list-server@matronics.com
[mailto:owner-yak-list-server@matronics.com] On Behalf Of Eric Wobschall
Sent: Friday, September 03, 2010 10:55 AM
To: yak-list@matronics.com
Subject: Re: Yak-List: Accelerator jet modification
Which size jets did you use?
On Sep 3, 2010, at 10:50 AM, Steven Johnson wrote:
I did not observe any change in CHT. My engine is running better
than before, although Dennis also found a couple of loose intake gland
nuts and tightened them at the same time he switched the jets in the
carb. It is really nice to push the throttle forward and feel an
immediate surge in power.
Steve Johnson
Yak 52 N9900X 0B5
413 522-1130 Cell
From: owner-yak-list-server@matronics.com
[mailto:owner-yak-list-server@matronics.com] On Behalf Of Eric Wobschall
Sent: Friday, September 03, 2010 10:32 AM
To: yak-list@matronics.com
Subject: Re: Yak-List: Accelerator jet modification
Steve:
Have you noticed any difference in CHT?
-Eric
On Sep 3, 2010, at 10:22 AM, Steven Johnson wrote:
I recently had Dennis Savarese swap the two accelerator jets on
the carburetor of my M14P. This totally eliminated all hesitation when
adding power on final. It is an easy modification that takes about an
hour. The carb is a little difficult to reach but the time spent is
well worth it. He merely switched the two jets with each other, no new
parts needed. Thanks Dennis.
Steve Johnson
Yak 52 N9900X 0B5
413 522-1130 Cell
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Thanks Eric
Here in South Africa, we do not get the Phillips Brand.
There is the Mobil Multigrade 20W 50, that comes from he USA.
Then we get the mono grades SAE 50 and 60
I am using Straight 120 (SAE 60) right now and have enough for a baout 10 hours.....after
which I will have to change to Straight 100 ( SAE 100)
Is this okay? what thoughts
Cheers
Francois
--------
Round Engines RULE!
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=311376#311376
Message 4
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Yakkers,
The engine
of my Yak52 has recently been removed in order to be repaired in Lithuania.
Problem: 5 cilinders having no or almost no compression.
Engine has always been maintained properly and compression checked regularly
up to this moment.
Any thoughts/ideas......???
Hans Oortman
YAK52 RA3326K
Netherlands
Message 5
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Nice place to have it overhauled. But if you are looking for constructive
comments You should at least tell the hours of your engine and at best tell
its history.
If I remember well, and I do, Richard Goode have a very professionnal place
to overhaul the M14P.
Didier.
2010/9/4 Hans Oortman <pa3arw@euronet.nl>
>
> Yakkers,
>
> The engine
> of my Yak52 has recently been removed in order to be repaired in Lithuania.
> Problem: 5 cilinders having no or almost no compression.
> Engine has always been maintained properly and compression checked
> regularly
> up to this moment.
> Any thoughts/ideas......???
>
> Hans Oortman
> YAK52 RA3326K
> Netherlands
>
>
--
Didier BLOUZARD
didier.blouzard@gmail.com
0624243672
Message 6
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In France we would love to have the Philips and it could be
possible..unfortunately the price would be too high to use in a Yak....
So we are using the Aeroshell W100 (dispersive) summer and winter.
Regards
Didier
2010/9/4 Francois Davel <fdavel@senninger.com>
>
> Thanks Eric
>
> Here in South Africa, we do not get the Phillips Brand.
>
> There is the Mobil Multigrade 20W 50, that comes from he USA.
>
> Then we get the mono grades SAE 50 and 60
>
> I am using Straight 120 (SAE 60) right now and have enough for a baout 10
> hours.....after which I will have to change to Straight 100 ( SAE 100)
>
> Is this okay? what thoughts
>
> Cheers
>
> Francois
>
> --------
> Round Engines RULE!
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=311376#311376
>
>
--
Didier BLOUZARD
didier.blouzard@gmail.com
0624243672
Message 7
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Could be a stuck valve . I found it is usually the exaust valve that
sticks it is easy to fix . Ifthe valvesnapped off that is really bad .
I could be wrong .
Terry
----- Original Message ----
From: Hans Oortman <pa3arw@euronet.nl>
Sent: Sat, September 4, 2010 3:43:28 PM
Subject: Yak-List: Compression
Yakkers,
The engine
of my Yak52 has recently been removed in order to be repaired in Lithuania.
Problem: 5 cilinders having no or almost no compression.
Engine has always been maintained properly and compression checked regularly
up to this moment.
Any thoughts/ideas......???
Hans Oortman
YAK52 RA3326K
Netherlands
Message 8
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Didier,
The engine has 220hrs since major overhaul. It was overhauled in Voronezh
and after that installed on my Yak52.
No further specifics. Engine has always been running within its limits and
never been really pushed to its limits.
Ran 80% of its time on Avgas and the remainder on a 50-50 mixture of Mogas
and Avgas.
No excessive oil consumption: i.e. 0.5 l/hr during overland cruise and 1
l/hr during aerobatics.
What else can I say??
Hans
Op 04-09-10 22:13, Didier Blouzard <didier.blouzard@gmail.com> schreef:
> Nice place to have it overhauled. But if you are looking for constructive
> comments You should at least tell the hours of your engine and at best tell
> its history.
>
> If I remember well, and I do, Richard Goode have a very professionnal place to
> overhaul the M14P.
>
> Didier.
>
> 2010/9/4 Hans Oortman <pa3arw@euronet.nl>
>>
>> Yakkers,
>>
>> The engine
>> of my Yak52 has recently been removed in order to be repaired in Lithuania.
>> Problem: 5 cilinders having no or almost no compression.
>> Engine has always been maintained properly and compression checked regularly
>> up to this moment.
>> Any thoughts/ideas......???
>>
>> Hans Oortman
>> YAK52 RA3326K
>> Netherlands
>>
>>
>>
>> ==========
> rget="_blank">http://www.matronics.com/Navigator?Yak-List
> <mailto:pa3arw@euronet.nl>
> ==========
> http://forums.matronics.com <mailto:pa3arw@euronet.nl>
> ==========
> le, List Admin.
> ="_blank">http://www.matronics.com/contribution <mailto:pa3arw@euronet.nl>
> ==========
>
>
>
>
>
Message 9
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You might try adjusting the valves sounds strange that you have 5
cylinders with no compression.
Frank
Message 10
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OK thanks Hans,
That's fine Hans.
I'll check around with my friends, and come back to you if any relevant
suggestion.
Good luck
best regards
2010/9/4 Hans Oortman <pa3arw@euronet.nl>
> Didier,
>
> The engine has 220hrs since major overhaul. It was overhauled in Voronezh
> and after that installed on my Yak52.
> No further specifics. Engine has always been running within its limits and
> never been really pushed to its limits.
> Ran 80% of its time on Avgas and the remainder on a 50-50 mixture of Mogas
> and Avgas.
> No excessive oil consumption: i.e. 0.5 l/hr during overland cruise and 1
> l/hr during aerobatics.
>
> What else can I say??
>
> Hans
>
>
> Op 04-09-10 22:13, Didier Blouzard <didier.blouzard@gmail.com> schreef:
>
> Nice place to have it overhauled. But if you are looking for constructive
> comments You should at least tell the hours of your engine and at best tell
> its history.
>
> If I remember well, and I do, Richard Goode have a very professionnal place
> to overhaul the M14P.
>
> Didier.
>
> 2010/9/4 Hans Oortman <pa3arw@euronet.nl>
>
>
> Yakkers,
>
> The engine
> of my Yak52 has recently been removed in order to be repaired in Lithuania.
> Problem: 5 cilinders having no or almost no compression.
> Engine has always been maintained properly and compression checked
> regularly
> up to this moment.
> Any thoughts/ideas......???
>
> Hans Oortman
> YAK52 RA3326K
> Netherlands
>
>
> ==========
>
> rget="_blank">http://www.matronics.com/Navigator?Yak-List <
> mailto:pa3arw@euronet.nl <pa3arw@euronet.nl>>
> ==========
> http://forums.matronics.com <mailto:pa3arw@euronet.nl <pa3arw@euronet.nl>>
>
> ==========
> le, List Admin.
> ="_blank">http://www.matronics.com/contribution <mailto:pa3arw@euronet.nl<pa3arw@euronet.nl>>
>
> ==========
>
>
> *
>
> *
>
>
--
Didier BLOUZARD
didier.blouzard@gmail.com
0624243672
Message 11
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Please disregard my previous post .
I misread the information .
Thought you meant #5 cylinder . Stills sounds like a valve problem internal
to the engine.
Terry
________________________________
From: Hans Oortman <pa3arw@euronet.nl>
Sent: Sat, September 4, 2010 4:58:37 PM
Subject: Re: Yak-List: Compression
Didier,
The engine has 220hrs since major overhaul. It was overhauled in Voronezh and
after that installed on my Yak52.
No further specifics. Engine has always been running within its limits and never
been really pushed to its limits.
Ran 80% of its time on Avgas and the remainder on a 50-50 mixture of Mogas and
Avgas.
No excessive oil consumption: i.e. 0.5 l/hr during overland cruise and 1 l/hr
during aerobatics.
What else can I say??
Hans
Op 04-09-10 22:13, Didier Blouzard <didier.blouzard@gmail.com> schreef:
Nice place to have it overhauled. But if you are looking for constructive
comments You should at least tell the hours of your engine and at best tell its
history.
>
>If I remember well, and I do, Richard Goode have a very professionnal place to
>overhaul the M14P.
>
>Didier.
>
>2010/9/4 Hans Oortman <pa3arw@euronet.nl>
>
>>
>>Yakkers,
>>
>>The engine
>>of my Yak52 has recently been removed in order to be repaired in Lithuania.
>>Problem: 5 cilinders having no or almost no compression.
>>Engine has always been maintained properly and compression checked regularly
>>up to this moment.
>>Any thoughts/ideas......???
>>
>>Hans Oortman
>>YAK52 RA3326K
>>Netherlands
>>
>>
>>
>>==========
>>rget="_blank">http://www.matronics.com/Navigator?Yak-List
>><mailto:pa3arw@euronet.nl>
>>
==========
http://forums.matronics.com <mailto:pa3arw@euronet.nl>
==========
le, List Admin.
="_blank">http://www.matronics.com/contribution <mailto:pa3arw@euronet.nl>
==========
Message 12
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Francois:
DO NOT use the multi-grade oils intended for flat engines. There is
usually an additive in there that screws up various M-14P items like
the pop-off valve.
In the absence of the radial-engine specific oil, use the 100 or 120
(SAE 50 or 60) for break in (50 hours) and the W100 or 120 (AD)
thereafter.
Have a great weekend. -Eric
On Sep 4, 2010, at 3:16 PM, Francois Davel wrote:
> <fdavel@senninger.com>
>
> Thanks Eric
>
> Here in South Africa, we do not get the Phillips Brand.
>
> There is the Mobil Multigrade 20W 50, that comes from he USA.
>
> Then we get the mono grades SAE 50 and 60
>
> I am using Straight 120 (SAE 60) right now and have enough for a
> baout 10 hours.....after which I will have to change to Straight 100
> ( SAE 100)
>
> Is this okay? what thoughts
>
> Cheers
>
> Francois
>
> --------
> Round Engines RULE!
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=311376#311376
>
>
Message 13
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Before rushing into anything check the magneto timing, it may be
retarded. Also I don't know how one was to determine 60 RPM with the
original tach, was kind of a guess.
Frank
Message 14
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The question I would ask is:
How many hours has it been since someone adjusted your valves?
Everyone seems to be on the same page of music here and is thinking valves. But
are you actually saying that FIVE CYLINDERS HAVE LITTLE OR NO COMPRESSION?
Not.. the #5 cylinder, but FIVE INDIVIDUAL CYLINDERS? Wow.
One thought is: If someone managed to really screw up the valve lash and tightened
the things down too much, your valves might never be allowed to fully close.
If that happened, your valves would burn up pretty darn quickly.
Lots of other things comes to mind. But cut to the chase. Get a bore-scope and
LOOK inside those cylinders. Look at the cylinder walls for scoring and look
at the valves for signs of burning and high temps.
When you run a compression test, what happens to the air you are putting in there?
Is it coming out the exhaust, or is it coming out the intake? A good mechanic
ought to be able to tell you what the heck is going on. Just saying: "Five
Cylinders have little or no compression" tells me that you might want to consider
getting someone who knows a little more what they are doing. I am not
a great engine mech. But even I know a little about the basics, and you should
not have to go to the YAK list for an answer. Not that I (or anyone else)
minds, but it is just that a good mechanic should be able to tell you.
Mark Bitterlich
--- On Sat, 9/4/10, Hans Oortman <pa3arw@euronet.nl> wrote:
> From: Hans Oortman <pa3arw@euronet.nl>
> Subject: Yak-List: Compression
> To: yak-list@matronics.com
> Date: Saturday, September 4, 2010, 3:43 PM
> Hans Oortman <pa3arw@euronet.nl>
>
> Yakkers,
>
> The engine
> of my Yak52 has recently been removed in order to be
> repaired in Lithuania.
> Problem: 5 cilinders having no or almost no compression.
> Engine has always been maintained properly and compression
> checked regularly
> up to this moment.
> Any thoughts/ideas......???
>
> Hans Oortman
> YAK52 RA3326K
> Netherlands
>
>
>
> Forum -
> FAQ,
> - MATRONICS WEB FORUMS -
> List Contribution Web Site -
> -Matt
> Dralle, List Admin.
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>
Message 15
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| Subject: | Re: Accelerator jet modification |
=C2-"We were discussing the old way of fixing the problem by plugging the
accelerator pump jet.=C2- Termikas' engine shop came up with the "fix" a
nd=C2-tested it on their engines, which is=C2-the mod which I made on S
teve's 52 (and several others including my personal Yak52 before I sold it)
."
=C2-
Hindsight is always 20/20, but I have to say that the way Dennis is doing i
t now (Termikas to be credited) is really the right way.=C2- Maybe pluggi
ng the jet actually worked in some cases, but being a Holly Carb tuner sinc
e ... a long time ago .... adjusting jet sizes for proper performance is AL
WAYS the right way to go.=C2- Good on Termikas... but good on Dennis for
making sure we all KNOW ABOUT IT!=C2- :-)
=C2-
Thanks Dennis.
=C2-
Mark
=C2-
--- On Sat, 9/4/10, A. Dennis Savarese <dsavarese0812@bellsouth.net> wrote:
From: A. Dennis Savarese <dsavarese0812@bellsouth.net>
Subject: Re: Yak-List: Accelerator jet modification
Andy,
As Mark says, first see if the engine hesitates.=C2- Then if you need to
make the modification, contact me off-list at dsavarese0812@bellsouth.net a
nd I will put something together for you.=C2- FWIW, this was not my creat
ion.=C2- It came from the Termikas engine shop whom I have great respect
for.=C2-=C2- We were discussing the old way of fixing the problem by pl
ugging the accelerator pump jet.=C2- Termikas' engine shop came up with t
he "fix" and=C2-tested it on their engines, which is=C2-the mod which I
made on Steve's 52 (and several others including my personal Yak52 before
I sold it).
Dennis
----- Original Message -----
From: Andy Hawes
Sent: Friday, September 03, 2010 11:59 AM
Subject: Re: Yak-List: Accelerator jet modification
I am actually getting fairly close to pulling out my M14 and was thinking t
his might be a good time to do this modification. =C2-Does Dennis or anyo
ne have any documentation that might take me through this step by step? =C2
-I have 0 time working on this engine, so if you guys think this is too t
echnical, I=99ll hold off.
It would be nice to not have to go through the =9Chesitancy=9D
learning curve --
Thank you,
Andy Hawes
Radial Rocket
Nashville, TN
On 9/3/10 10:10 AM, "Eric Wobschall" <eric@buffaloskyline.com> wrote:
thx
On Sep 3, 2010, at 11:00 AM, Steven Johnson wrote:
He just switched the two jets. The sizes were hard to read but I think one
indicated 1.0mm and the other 0.6mm.
=C2-
Steve Johnson
Yak 52 N9900X 0B5
413 522-1130 Cell
=C2-
From: owner-yak-list-server@matronics.com [mailto:owner-yak-list-server@mat
ronics.com] On Behalf Of Eric Wobschall
Sent: Friday, September 03, 2010 10:55 AM
Subject: Re: Yak-List: Accelerator jet modification
Which size jets did you use?
=C2-
=C2-
On Sep 3, 2010, at 10:50 AM, Steven Johnson wrote:
I did not observe any change in CHT. My engine is running better than befor
e, although Dennis also found a couple of loose intake gland nuts and tight
ened them at the same time he switched the jets in the carb. It is really n
ice to push the throttle forward and feel an immediate surge in power.
=C2-
Steve Johnson
Yak 52 N9900X 0B5
413 522-1130 Cell
=C2-
From: owner-yak-list-server@matronics.com [mailto:owner-yak-list-server@mat
ronics.com] On Behalf Of Eric Wobschall
Sent: Friday, September 03, 2010 10:32 AM
Subject: Re: Yak-List: Accelerator jet modification
Steve:
=C2-
Have you noticed any difference in CHT?
=C2-
-Eric
=C2-
=C2-
On Sep 3, 2010, at 10:22 AM, Steven Johnson wrote:
I recently had Dennis Savarese swap the two accelerator jets on the carbure
tor of my M14P. This totally eliminated all hesitation when adding power on
final. It is an easy modification that takes about an hour. The carb is a
little difficult =C2-to reach but the time spent is well worth it. He mer
ely switched the two jets with each other, no new parts needed. Thanks Denn
is.
=C2-
Steve Johnson
Yak 52 N9900X 0B5
413 522-1130 Cell
=C2-
=C2-
style="color: blue; text-decoration: underline; ">http://www.matronics.co
m/Navigator?Yak-List
blue; text-decoration: underline; ">http://forums.matronics.com
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Message 16
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This really sounds interesting! I agree with Mark on a lot here.
If you have burnt exhaust valves, pressurizing the cylinder while the pist
on is a TDC, you will hear air in the exhaust stack. The same will happen
if the valve is not fully seated. If the intake valve is brunt or not fu
lly closed, you'll hear air in the carburetor intake. If the rings are ba
d you will hear air in case, when you put your ear to the case breather.
Also starting the engine would be harder. Since both valves need to be cl
osed with the piston slightly passed TDC and on the power stroke.
One time on my HS6 I had a brunt exhaust valve. Its only give away was oc
casionally it would not start kick over when I hit the start button. I wo
uld need to get out of the airplane, and pull the prop though one blade.
The engine seem to run OK otherwise. Its wasn't until I did a compressi
on check at the annual, did I find the problem! One of those duhhhh momen
ts.
You might want to check the little pop it valve on the cylinders. If thes
e are not seated, (crap under their seats) they could allow pressurized ai
r to escape back toward the starter valve.
Let us know what they find. For an M-14p to have that many cylinders so
low with as little time on the engine as you say, is very usual.
Jim "Pappy" Goolsby
-----Original Message-----
From: Yak Pilot <yakplt@yahoo.com>
Sent: Sat, Sep 4, 2010 8:09 pm
Subject: Re: Yak-List: Compression
The question I would ask is:
How many hours has it been since someone adjusted your valves?
Everyone seems to be on the same page of music here and is thinking valves
. But
re you actually saying that FIVE CYLINDERS HAVE LITTLE OR NO COMPRESSION?
ot.. the #5 cylinder, but FIVE INDIVIDUAL CYLINDERS? Wow.
One thought is: If someone managed to really screw up the valve lash and
ightened the things down too much, your valves might never be allowed to
fully
lose. If that happened, your valves would burn up pretty darn quickly.
Lots of other things comes to mind. But cut to the chase. Get a bore-sco
pe and
OOK inside those cylinders. Look at the cylinder walls for scoring and lo
ok at
he valves for signs of burning and high temps.
When you run a compression test, what happens to the air you are putting
in
here? Is it coming out the exhaust, or is it coming out the intake? A go
od
echanic ought to be able to tell you what the heck is going on. Just sayi
ng:
Five Cylinders have little or no compression" tells me that you might want
to
onsider getting someone who knows a little more what they are doing. I am
not
great engine mech. But even I know a little about the basics, and you sh
ould
ot have to go to the YAK list for an answer. Not that I (or anyone else)
inds, but it is just that a good mechanic should be able to tell you.
Mark Bitterlich
-- On Sat, 9/4/10, Hans Oortman <pa3arw@euronet.nl> wrote:
> From: Hans Oortman <pa3arw@euronet.nl>
Subject: Yak-List: Compression
To: yak-list@matronics.com
Date: Saturday, September 4, 2010, 3:43 PM
Hans Oortman <pa3arw@euronet.nl>
Yakkers,
The engine
of my Yak52 has recently been removed in order to be
repaired in Lithuania.
Problem: 5 cilinders having no or almost no compression.
Engine has always been maintained properly and compression
checked regularly
up to this moment.
Any thoughts/ideas......???
Hans Oortman
YAK52 RA3326K
Netherlands
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