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Engine problems

 
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JAYRES(at)entergy.com
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PostPosted: Mon Jan 09, 2006 8:35 am    Post subject: Engine problems Reply with quote


Hey fellow RV'ers,


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LessDragProd(at)aol.com
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PostPosted: Mon Jan 09, 2006 8:58 am    Post subject: Engine problems Reply with quote



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gerf(at)gerf.com
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PostPosted: Mon Jan 09, 2006 9:10 am    Post subject: Engine problems Reply with quote


I experienced something similar flying a rental plane with an
IO-240 - took the FBO months to figure it out - in the end
turned out to be a cracked exhaust manifold - or so I was told.
The engine didn't actually quit but it coughed and shuddered in
a very scarey way when re-applying power on the go-around.
Something to check maybe ...
g
Quote:


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wskimike(at)mchsi.com
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PostPosted: Mon Jan 09, 2006 2:03 pm    Post subject: Engine problems Reply with quote


Try to find an intake leak. Check compression and timing to eliminate all
the easy items that would cause trouble. Has your exhaust gas temp gone up?
Has your fuel burn increased? Does it miss at idle or any other RPM? Give us
more to go on.
Mike Harris


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JAYRES(at)entergy.com
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PostPosted: Mon Jan 09, 2006 2:48 pm    Post subject: Engine problems Reply with quote


Mike,
Thanks for your input. I will give you as much info as I can.
1. I haven't put a gauge on it, but compression seems normal on all
cylinders when pulling prop through.
2. Don't have EGT gauge.
3. Have not noticed any change in fuel burn.
4. Does not miss at idle when cold, however, after the problem develops, it
is hard to start and runs rough at all power settings including idle.
This past weekend after once around the patch, the engine starting showing
the problem again. So I took it up to around 5000 msl and repeated running
at full power, pulling back to idle, and then re-applying power at different
mixture settings and with/without carb heat. The engine consistently lost
power completely (to the point of almost dying) and then gradually came back
to full power. It really didn't like the carb heat and seemed to be worse
with the leaner settings, but still did the same thing at full rich although
to a lesser degree.
I have pulled the spark plugs and cleaned them, although I did not find any
of them dirty or fouled.
I replaced the carb, air filter, checked all intake tube clamps for
tightness. Checked fuel inlet screen for cleanliness.
If you (or anyone) has more questions, please let me know. I have got to
get this problem corrected.
Thanks again, Jimmy


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rv(at)discursion.com
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PostPosted: Mon Jan 09, 2006 3:11 pm    Post subject: Engine problems Reply with quote


Very difficult to diagnose trouble like this without at least an EGT
gauge. It sounds an awful lot like an induction leak to me on one or
more cylinders, especially given the list of things you've already done.
A multi-point EGT gauge would pinpoint this in a heartbeat with
increased EGT and CHTs on the affected cylinder(s).
You can sometimes pinpoint an induction leak with soapy water and a shop
vac blowing filtered air into the induction system to pressurize it.
Just spray the intake runners, intake ports, and any other connection
points with soapy water solution and look for bubbles
Dave
AYRES, JIMMY L wrote:
Mike,
Thanks for your input. I will give you as much info as I can.
1. I haven't put a gauge on it, but compression seems normal on all
cylinders when pulling prop through.
2. Don't have EGT gauge.
3. Have not noticed any change in fuel burn.
4. Does not miss at idle when cold, however, after the problem develops, it
is hard to start and runs rough at all power settings including idle.
This past weekend after once around the patch, the engine starting showing
the problem again. So I took it up to around 5000 msl and repeated running
at full power, pulling back to idle, and then re-applying power at different
mixture settings and with/without carb heat. The engine consistently lost
power completely (to the point of almost dying) and then gradually came back
to full power. It really didn't like the carb heat and seemed to be worse
with the leaner settings, but still did the same thing at full rich although
to a lesser degree.
I have pulled the spark plugs and cleaned them, although I did not find any
of them dirty or fouled.
I replaced the carb, air filter, checked all intake tube clamps for
tightness. Checked fuel inlet screen for cleanliness.
If you (or anyone) has more questions, please let me know. I have got to
get this problem corrected.
Thanks again, Jimmy


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flyrv6(at)bryantechnology
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PostPosted: Mon Jan 09, 2006 3:30 pm    Post subject: Engine problems Reply with quote


Jimmy,
This statement: "seemed to be worse with the leaner settings"
would support the possibility of an intake leak. However you did suggest
you checked the intake clamps, you might want to look a little deeper in
that direction.
Tim


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randy(at)romeolima.com
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PostPosted: Mon Jan 09, 2006 3:49 pm    Post subject: Engine problems Reply with quote


Disconnect the fuel line from the carb, put it in an accurate gallon
measuring jug, turn the aux fuel pump on for exactly one minute, measure the
output, and multiply by 60 to get your gph. You should have at LEAST 25 gph.
This will ensure that you're getting enough fuel, good idea to eliminate
that variable too.
Randy Lervold
rv-3.com
EAA Technical Counselor


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rv(at)discursion.com
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PostPosted: Mon Jan 09, 2006 4:17 pm    Post subject: Engine problems Reply with quote


Jim,
One more thing- there is a good reference to a useful trick for finding
induction and exhaust system leaks here: http://www.bvila.net/page33.html
Ten bucks says it's an induction leak, and that even a good visual
inspection and clamp tightening will probably turn up the culprit.
Dave
AYRES, JIMMY L wrote:
Mike,
Thanks for your input. I will give you as much info as I can.
1. I haven't put a gauge on it, but compression seems normal on all
cylinders when pulling prop through.
2. Don't have EGT gauge.
3. Have not noticed any change in fuel burn.
4. Does not miss at idle when cold, however, after the problem develops, it
is hard to start and runs rough at all power settings including idle.
This past weekend after once around the patch, the engine starting showing
the problem again. So I took it up to around 5000 msl and repeated running
at full power, pulling back to idle, and then re-applying power at different
mixture settings and with/without carb heat. The engine consistently lost
power completely (to the point of almost dying) and then gradually came back
to full power. It really didn't like the carb heat and seemed to be worse
with the leaner settings, but still did the same thing at full rich although
to a lesser degree.
I have pulled the spark plugs and cleaned them, although I did not find any
of them dirty or fouled.
I replaced the carb, air filter, checked all intake tube clamps for
tightness. Checked fuel inlet screen for cleanliness.
If you (or anyone) has more questions, please let me know. I have got to
get this problem corrected.
Thanks again, Jimmy


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alexpeterson(at)earthlink
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PostPosted: Mon Jan 09, 2006 4:43 pm    Post subject: Engine problems Reply with quote



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n320wt(at)yahoo.com
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PostPosted: Mon Jan 09, 2006 6:08 pm    Post subject: Engine problems Reply with quote


Jimmy, Don't assume that the correct fuel pressure means you have the correct fuel flow. Test the flow at the input to the carb. If the flow is correct, you can easily find induction leaks with a can of starting fluid. I remove the cowling, start the engine and let it idle. Spray starting fluid around the connections at the sump and at the heads and listen for an rpm increase. If you have a leak, I guarantee you'll find it!!! Just make sure you stay away from the prop.
BRIAN ALLEY (N320WT)
CARBON FIBER COMPOSITES
101 Caroline Circle
Hurricane, WV 25526
304-562-6800 home
304-395-4932 cell
How are you going to win by a nose if you don't stick out your neck?


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truflite(at)yahoo.com
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PostPosted: Mon Jan 09, 2006 6:48 pm    Post subject: Engine problems Reply with quote


Sound like there is a leak in the intake system. When
the carb is closed, the needle goes leaner due to the
high vacuum. Add air from a leak, engine goes
severely lean.
--- "AYRES, JIMMY L" <JAYRES(at)entergy.com> wrote:
<JAYRES(at)entergy.com>


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LessDragProd(at)aol.com
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PostPosted: Tue Jan 10, 2006 6:19 am    Post subject: Engine problems Reply with quote



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