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  #1  
Old 11-11-2017, 11:57 AM
Wiley Price Wiley Price is offline
 
Join Date: Oct 2017
Location: Pactolus, nc
Posts: 4
Default RV6-A 0-360 stops at less than 1200 rpm

I flew into KUDG and landed after a 2.5 hr flight. The engine quit on short final and was a bit hard to restart after roll out. I refueled, ran engine w/boost pump on,tried each mag, carb heat on/off, still stumbled and quit if throttled below 1200. Perhaps foolishly flew home and same thing happened on short final. I pulled cowls off and found gascolator bowl full of water. Installed quick drain, refueled - no water in tanks or gascolator, but same problem of engine stopping at lower than 1200. Boost pump works ok, carb screen clean and gascolator screen clean.
What else could I look at? Needless to say, it is quite unsettling.
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  #2  
Old 11-11-2017, 12:17 PM
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Ironflight Ironflight is offline
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Default

Did you drain the carb bowl? If you had that much water in the system, you might have water in the bottom of the bowl.
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  #3  
Old 11-11-2017, 12:37 PM
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Mike S Mike S is offline
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Default Welcome to VAF

Wiley, welcome aboard the good ship VAF

Agree with Paul, check carb bowl.
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  #4  
Old 11-11-2017, 12:50 PM
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Larry DeCamp Larry DeCamp is offline
 
Join Date: Apr 2010
Location: Clinton, Indiana
Posts: 535
Default Please educate me

I am MS carb challenged. I thought fuel comes from the bottom of the bowl to the main jet and the idle circuit would use a small portion of that capability. If the engine gets fuel to fly, why is the idle function subject to water ? Is the idle supply intake separate and BELOW the main jet orifice in the bowl ?
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  #5  
Old 11-11-2017, 01:01 PM
Wiley Price Wiley Price is offline
 
Join Date: Oct 2017
Location: Pactolus, nc
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I forgot to mention, carb bowl was drained - no water there. Engine was installed new along w/carb, mags, etc. : has about 900 hrs total. I'm not sure why gascolator was in stalled w/o drain, but I did let water out! What else?
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  #6  
Old 11-11-2017, 01:26 PM
Timberwolf Timberwolf is offline
 
Join Date: Nov 2016
Location: Navarre, FL
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I’m still trying to wrap my brain around why anyone would fly an airplane back home after it just quit on short final and wouldn’t run below 1200rpm. I feel like you were awfully close to becoming a statistic.
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  #7  
Old 11-11-2017, 01:29 PM
Larco Larco is offline
 
Join Date: Mar 2005
Location: DVT Phoenix
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If the water was dirty and contaminated it may have plugged up the idle circuit?? The carb may need to be disassembled and given a good cleaning and a shot of air through the circuits.
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  #8  
Old 11-11-2017, 01:30 PM
rvbuilder2002 rvbuilder2002 is offline
 
Join Date: Jul 2005
Location: Hubbard Oregon
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This is one of the common symptoms of a failing (sinking) float.
It causes the engine to start running overly rich which can be tolerated at higher RPM's but not down near idle.
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  #9  
Old 11-11-2017, 01:50 PM
Larco Larco is offline
 
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Yup. Another reason to have the carb disassembled by an expert and looked over.
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  #10  
Old 11-11-2017, 01:53 PM
jrs14855 jrs14855 is offline
 
Join Date: Apr 2008
Location: Lake Havasu City AZ
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Default Idle

Quote:
Originally Posted by Larco View Post
If the water was dirty and contaminated it may have plugged up the idle circuit?? The carb may need to be disassembled and given a good cleaning and a shot of air through the circuits.
Could also be FOD ingested via carb heat or alternate air. Same result: blockage in idle circuit.
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