Today's Message Index:
----------------------
1. 01:09 AM - Re: High EGT's (Jay Hyde)
2. 03:49 AM - Re: High EGT's (=?ISO-8859-1?Q?J=F3hann_J=F3hannsson?=)
3. 04:43 AM - Re: High EGT's (Catz631@aol.com)
4. 06:09 AM - Re: High EGT's (klinefelter.kevin@gmail.com)
5. 06:50 AM - Re: High EGT's (Roger Lee)
6. 03:09 PM - Re: High EGT's (Richard Girard)
7. 04:55 PM - Nitrile Float Bowl Gasket (Robert Borger)
8. 06:15 PM - Re: High EGT's (FLYaDIVE)
Message 1
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Check that your slides in the carburettors are opening at exactly the same
time; that was the problem that I had on my 582 with one cylinder running
hotter than the other.
Jay
-----Original Message-----
From: owner-rotaxengines-list-server@matronics.com
[mailto:owner-rotaxengines-list-server@matronics.com] On Behalf Of danb
Sent: 24 May 2012 04:28 AM
Subject: RotaxEngines-List: High EGT's
Bear with me as I'm a newbie breaking in a 912s. I recently started flying
my Kitfox and now have 20 hours on it. I went flying yesterday morning and
decided to fly her a little hotter than I normally have been doing at around
45-4600RPM (mostly to conserve fuel). I was told by a friend that also flies
the same bird/engine and said I was babying it...so I pushed it at 5400 RPM.
After flying for about an hour my Grand Rapids EIS started flashing me with
high EGT's, but only on one side. I have all 4 sensors hooked up and the
flash was showing me one side (both cylinders) dancing around 1600's and the
other side was down around the 1400's where I read is about right. I have
searched and read several of the EGT issues so I have a bit of a handle on
how many don't even show or worry about the EGT's and that the engine should
not be tinkered with as it is set where it belongs at the factory. Also that
the thing to really look at is the number spread...my thinking is now my
numbe!
rs are out between the two sides.
So, I'm looking for advice as I believe one side is probably running leaner
than the other. I saw the post to take a look at the rubber boots and make
sure of no cracks so I will do that. If ok, what should my next step be?
Thanks in advance,
Dan B
Mesa, AZ
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=373722#373722
Message 2
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Hello Dan.
Run your engine at 5000 rpm i.e. 75% power setting and you will see
different EGTs. If not, you need to check your carbs to see what has
changed. Could need some balancing at higher rpm.
Hope this will help.
Johann G.
On 24.5.2012, at 02:27, danb wrote:
>
> Bear with me as I'm a newbie breaking in a 912s. I recently started
> flying my Kitfox and now have 20 hours on it. I went flying
> yesterday morning and decided to fly her a little hotter than I
> normally have been doing at around 45-4600RPM (mostly to conserve
> fuel). I was told by a friend that also flies the same bird/engine
> and said I was babying it...so I pushed it at 5400 RPM. After flying
> for about an hour my Grand Rapids EIS started flashing me with high
> EGT's, but only on one side. I have all 4 sensors hooked up and the
> flash was showing me one side (both cylinders) dancing around 1600's
> and the other side was down around the 1400's where I read is about
> right. I have searched and read several of the EGT issues so I have
> a bit of a handle on how many don't even show or worry about the
> EGT's and that the engine should not be tinkered with as it is set
> where it belongs at the factory. Also that the thing to really look
> at is the number spread...my thinking is now my numbe!
> rs are out between the two sides.
> So, I'm looking for advice as I believe one side is probably running
> leaner than the other. I saw the post to take a look at the rubber
> boots and make sure of no cracks so I will do that. If ok, what
> should my next step be?
> Thanks in advance,
> Dan B
> Mesa, AZ
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=373722#373722
>
>
Message 3
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Dan,
I wouldn't worry too much about the EGT's .Rpm's and carb needle setting
will have an effect on the readings
You should definately not be cruising below 5000 rpm. The engine is
designed to run above 5000. I was taught this in the 3 Rotax engine courses I
have attended...which I very strongly advise you to try to put in your schedule
if you want to maintain your engine properly.
Dick Maddux
Fox 4
Milton,Fl
Message 4
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Dick,
Excellent advice.
Dan, How do your spark plugs look? If they are gapped properly and all the s
ame tan/grey color all is well.
Kevin
Europa, 914
On May 24, 2012, at 4:42 AM, Catz631@aol.com wrote:
> Dan,
> I wouldn't worry too much about the EGT's .Rpm's and carb needle setting w
ill have an effect on the readings
> You should definately not be cruising below 5000 rpm. The engine is desi
gned to run above 5000. I was taught this in the 3 Rotax engine courses I ha
ve attended...which I very strongly advise you to try to put in your schedul
e if you want to maintain your engine properly.
>
> Dick Maddux
> Fox 4
> Milton,Fl
>
>
==========================
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=========
==========================
=========
==========================
=========
>
Message 5
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Hi Dan,
Other people are right about not cruising in the 4K rpm range. Your engine was
never designed to run in that rpm for it's every day cruise. 5000-5400 rpm at
cruise is normal and best for the engine. You are right that the normal EGT temps
are in the 1400's. There are a few things that can cause those high EGT's.
1600 EGT is too high. It would be nice to know a couple of other numbers. What
was the CHT and oil temps, were they high too? What is your WOT (wide open throttle)
rpm? It should be around 5500-5600 rpm for normal every day flying. What
is the spark plug gap set at? It should be between .023 - .027. The .027 is
better for the summer temps and running. Out of curiosity what is your mag drop
and at what rpm? Usually a mag drop of 50-90 is normal if done around 3500
rpm. Have the carbs been synced within the last 10 hrs?
If it was running okay on all EGT's for a while and then all of a sudden went to
1600 then you may have an obstruction in a carb bowl at the jet on that side.
That would lean the fuel on that side and cause the EGT's to shoot up. An air
leak could cause this and I doubt your carb boots are cracked, but make sure
the carbs are snuggly in the rubber sockets.
Your comment about not altering the carbs because they are good to go at the factory
settings for needle position is good advice.
Give me a call if you have any other questions.
520-574-1080
p.s. There are a few exceptions to carb needle position and prop pitch, but I doubt
you are in that very select few.
--------
Roger Lee
Tucson, Az.
Light Sport Repairman - Maintenance Rated
Rotax Repair Center - Heavy Maint. Rated
Home 520-574-1080 TRY HOME FIRST
Cell 520-349-7056
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=373759#373759
Message 6
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If you have a way to disconnect the EGT senders, swap them from side to
side and see if the temps stay the same or follow the senders.
Rick Girard
On Thu, May 24, 2012 at 8:08 AM, <klinefelter.kevin@gmail.com> wrote:
> Dick,
> Excellent advice.
> Dan, How do your spark plugs look? If they are gapped properly and all the
> same tan/grey color all is well.
> Kevin
> Europa, 914
>
>
> On May 24, 2012, at 4:42 AM, Catz631@aol.com wrote:
>
> Dan,
> I wouldn't worry too much about the EGT's .Rpm's and carb needle setting
> will have an effect on the readings
> You should definately not be cruising below 5000 rpm. The engine is
> designed to run above 5000. I was taught this in the 3 Rotax engine courses
> I have attended...which I very strongly advise you to try to put in your
> schedule if you want to maintain your engine properly.
>
> Dick Maddux
> Fox 4
> Milton,Fl
>
> *
>
> *
>
> *
>
> *
>
>
--
Zulu Delta
Mk IIIC
Thanks, Homer GBYM
It isn't necessary to have relatives in Kansas City in order to be unhappy.
- Groucho Marx
Message 7
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| Subject: | Nitrile Float Bowl Gasket |
Rotax 9xx folks,
FWIW, I located a source of Nitrile float bowl gaskets for the Bing 64 carbs on
the Rotax 912 & 914 engines.
Supposed to be superior to both the paper and cork gaskets:
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=320625111138#ht_1255wt_1165
I have ordered a pair of them to see how they will work and will let the lists
know what I find out.
Blue skies & tailwinds,
Bob Borger
Europa XS Tri, Rotax 914, Airmaster C/S Prop.
Little Toot Sport Biplane, Lycoming Thunderbolt AEIO-320 EXP
3705 Lynchburg Dr.
Corinth, TX 76208-5331
Cel: 817-992-1117
rlborger@mac.com
Message 8
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Dan:
Run the engine in the manufactures suggested operational range.
Monitor the EGT & CHT(if you have them). Yea, yea, yea, I know you are
water cooled and all cylinders should be the same... SHOULD BE!
Do some tests as Richard suggested - This is to rule out the probes as
being a problem.
BUT! If you still see a 200 F differance between one side of the engine
and the other. And personally even at lower RPM's - There is something
wrong when you have that high a EGT and with that wide of a temperature
spread (200 F). YES WORRY!
Otherwise throw away the EGT gauge and taHell with indicators --- Ignorance
is bliss.
Barry
On Thu, May 24, 2012 at 7:42 AM, <Catz631@aol.com> wrote:
> Dan,
> I wouldn't worry too much about the EGT's .Rpm's and carb needle setting
> will have an effect on the readings
> You should definately not be cruising below 5000 rpm. The engine is
> designed to run above 5000. I was taught this in the 3 Rotax engine courses
> I have attended...which I very strongly advise you to try to put in your
> schedule if you want to maintain your engine properly.
>
> Dick Maddux
> Fox 4
> Milton,Fl
>
> *
>
> *
>
>
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