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06-30-2012, 09:34 PM
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Join Date: Dec 2011
Location: 18Y (Milaca MN)
Posts: 3
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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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06-30-2012, 10:01 PM
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Join Date: Nov 2006
Location: Cumming, GA
Posts: 610
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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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Don Hall
N517DG - RV7 - Flying!
Ticked Van's Hobbes meter at #6110, 3/7/09
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06-30-2012, 10:17 PM
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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.
__________________
Steve Zicree
Fullerton, Ca. w/beautiful 2.5 year old son 
RV-4 99% built  and sold 
Rag and tube project well under way
paid =VAF= dues through June 2013
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07-01-2012, 05:37 AM
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Join Date: Aug 2005
Location: Dallas/Ft Worth, TX
Posts: 5,686
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I'd also pull the carb and go through it.
__________________
Walt Aronow, DFW, TX (52F)
EXP Aircraft Services LLC
Specializing in RV Condition Inspections, Maintenance, Avionics Upgrades
Dynamic Prop Balancing, Pitot-Static Altmeter/Transponder Certification
FAA Certified Repair Station, AP/IA/FCC GROL, EAA Technical Counselor
Authorized Garmin G3X Dealer/Installer
RV7A built 2004, 1700+ hrs, New Titan IO-370, Bendix Mags
Website: ExpAircraft.com, Email: walt@expaircraft.com, Cell: 972-746-5154
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07-01-2012, 07:38 AM
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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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07-01-2012, 07:46 AM
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Join Date: Sep 2005
Location: Maple Grove, MN
Posts: 2,333
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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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Alex Peterson
RV6A N66AP 1700+ hours
KADC, Wadena, MN
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07-02-2012, 06:36 AM
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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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07-02-2012, 07:56 AM
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Join Date: Aug 2010
Location: Rochester, NY
Posts: 174
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Quote:
Originally Posted by jeffpohl4
i guess ill have to wait till it acts up again...thanks for all the help guys!
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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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07-02-2012, 08:22 AM
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Join Date: Jul 2005
Location: North Atlanta
Posts: 1,120
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I'd look at the carb. The float in particular.
__________________
Sid Lambert
RV-7 Sold
RV-4 - Flying - O-320 Fixed Pitch - Red over Yellow
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07-02-2012, 08:40 AM
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Join Date: Dec 2007
Location: SC & CA
Posts: 907
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Fuel Boost Pump???
Did you forget to switch the fuel boost pump on prior to the aerobatics?
__________________
Tom Valenzia
RV8 (Sold)
RV12 Jabiru 2200 Powered (Sold)
Dues contributor since 2007
Learn from the mistakes of others. You won't live long enough to make all of them yourself...Anonymous
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