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  #1  
Old 06-30-2012, 09:34 PM
jeffpohl4 jeffpohl4 is offline
 
Join Date: Dec 2011
Location: 18Y (Milaca MN)
Posts: 3
Exclamation Help...Engine Issues

I have over 250 hrs in my RV6A with a TMXO 360 and a C/S prop...here's the situation. Yesterday i was out performing a few loops and i had the engine stall out on me twice, initially i thought "ok maybe i went a little negative and starved the engine of fuel" although i entered the maneuver at 140 and pulled 3G's like several uneventful times before. Today i took her out again and made an approximately 2-2.5G climbing left hand turn at about a 60 degree bank with the fuel selector on the right tank and it coughed out again!!! now i have grounded the RV until further notice...has anyone experienced anything like this before? I fly my RV very regularly and in a similar fashion to the maneuvers described above and it has never sputtered once. Oil pressure is good, fuel pressure is good, mags check out, CHT and EGT are normal. Any ideas would be great, thank you in advance, Jeff
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  #2  
Old 06-30-2012, 10:01 PM
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dhall_polo dhall_polo is offline
 
Join Date: Nov 2006
Location: Cumming, GA
Posts: 610
Default fuel pickup issue?

loose fitting on the fuel pickup line inside the tank? perhaps sucking air at certain fuel levels and angles of pitch/bank?
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  #3  
Old 06-30-2012, 10:17 PM
szicree szicree is offline
 
Join Date: Jan 2005
Location: SoCal
Posts: 2,061
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Fuel pump going bad? Fuel filter clogged? Partially clogged vent? I'd go with stuff that is most likely to occur with normal wear and tear.
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  #4  
Old 07-01-2012, 05:37 AM
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Walt Walt is offline
 
Join Date: Aug 2005
Location: Dallas/Ft Worth, TX
Posts: 5,686
Default

I'd also pull the carb and go through it.
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  #5  
Old 07-01-2012, 07:38 AM
jeffpohl4 jeffpohl4 is offline
 
Join Date: Dec 2011
Location: 18Y (Milaca MN)
Posts: 3
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Thanks for all the ideas...im on my way to the airport shortly and will start with the obvious and go from there...i hope i can figure it out, i don't ever want to bring my RV in dead stick...she has the glide ratio of a thousand pound rock lol
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  #6  
Old 07-01-2012, 07:46 AM
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AlexPeterson AlexPeterson is offline
 
Join Date: Sep 2005
Location: Maple Grove, MN
Posts: 2,333
Default

It could be vapor lock. The pump on the engine has to pull fuel "higher" when pulling g's. Meaning, it needs a bit more vacuum at the inlet of the pump to suck the fuel than during 1 g flight. Try it with the boost pump on.
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  #7  
Old 07-02-2012, 06:36 AM
jeffpohl4 jeffpohl4 is offline
 
Join Date: Dec 2011
Location: 18Y (Milaca MN)
Posts: 3
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I tried everything i could think of but could not get her to spit or sputter again, i did go through and check both tanks and gascolator etc but only found a small amount of debris in the filter...i don't believe enough to make any sort of difference. i guess ill have to wait till it acts up again...thanks for all the help guys!
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  #8  
Old 07-02-2012, 07:56 AM
Phlyan Pan Phlyan Pan is offline
 
Join Date: Aug 2010
Location: Rochester, NY
Posts: 174
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Quote:
Originally Posted by jeffpohl4 View Post
i guess ill have to wait till it acts up again...thanks for all the help guys!
What if the next time it acts up is at 200 feet on climbout over a crowded neighborhood?

I would take a serious look at everything and maybe even have a professional take a complete look at it before I just continued with business as usual.

Just my opinion. Worth what you paid for it.
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  #9  
Old 07-02-2012, 08:22 AM
Sid Lambert Sid Lambert is offline
 
Join Date: Jul 2005
Location: North Atlanta
Posts: 1,120
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I'd look at the carb. The float in particular.
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  #10  
Old 07-02-2012, 08:40 AM
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TomVal TomVal is offline
 
Join Date: Dec 2007
Location: SC & CA
Posts: 907
Default Fuel Boost Pump???

Did you forget to switch the fuel boost pump on prior to the aerobatics?
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