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12-26-2012, 07:29 AM
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Join Date: Oct 2008
Location: Arlington, WA
Posts: 799
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Lost a cylinder on take-off
I'd like some help on troubleshooting...
Christmas Eve - I was taking a wanna-be pilot up for a second flight in my RV. She's starting ground school next week. After a normal engine run-up, we taxied onto the Rwy 34 and smoothly applied power. The IO-360 was purring along, we rolled down the runway, and lifted off. Everything was still running smooth.
At about 350' agl, the engine suddenly started running rough. My #2EGT immediately started climbing, all other EGT stayed normal. I didn't notice any change to CHT, but I was paying attention to other things at the time. I used my airspeed to zoom to about 650' agl, pulled power back to about 1700 rpm, and held airspeed (which had bled off in the zoom) at about 80 mph. I made a shallow left pattern turn to downwind, and then realized that I had the pattern to myself and Rwy 11 directly under my wing.
I chopped the power, dropped in full flaps, and slipped down to land on Rwy 11. I landed on the last 1/3 of the runway since I had made my decision to land when I was over the numbers and I had 650' to lose.
After landing, I did a quick runup, and the engine ran just fine. Back to the hangar - still running fine.
Back at the hangar, I pulled the cowl and did a compression test. Compression was good and I didn't hear any intake or exhaust leak-by. The exhaust stack coming from the #2 cylinder was sooty, the other stack was clean. Pulling the plugs from #2 cylinder - dark brown color.
So... What's next?
__________________
_______________________________
Scott "Grumpy" Stewart
RV-7 N957RV (First Flight on Dec 18, 2009 )
RV-14 N144P (Empennage complete, wings almost complete, fuselage almost complete)
#866 on the Van's RV-7 hobbs
#6563 on Van's generic hobbs
Arlington, WA
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12-26-2012, 07:30 AM
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Join Date: Jan 2005
Location: St. Paul, MN.
Posts: 4,792
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#2 injector check?
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12-26-2012, 07:34 AM
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Join Date: Mar 2009
Location: Rochester NY
Posts: 669
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Assuming fuel injection. Using 100LL? Mags or EI? Any recent maintenance? Do you have an engine analyzer with recorded history?
Dan
__________________
RV7A (N7101) - Flying 10/2008
CFI- SE/ME/Inst
A&P
KC2ZEL
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12-26-2012, 07:49 AM
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Join Date: Oct 2008
Location: Arlington, WA
Posts: 799
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Quote:
Originally Posted by DanBaier
Assuming fuel injection. Using 100LL? Mags or EI? Any recent maintenance? Do you have an engine analyzer with recorded history?
Dan
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I've got the Dynon D100 EMS - I'm going to take the laptop to the hangar this afternoon to see if I can download data. (I've never done this before, so I don't know if I have it set up to record data)
The engine is an IO-360, running straight mogas (except for cross country) for the past 500 hours. One mag, one LightSpeed Ign. Plugs are in good condition with correct gaps.
What's an injector check?
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Scott "Grumpy" Stewart
RV-7 N957RV (First Flight on Dec 18, 2009 )
RV-14 N144P (Empennage complete, wings almost complete, fuselage almost complete)
#866 on the Van's RV-7 hobbs
#6563 on Van's generic hobbs
Arlington, WA
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12-26-2012, 08:03 AM
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Join Date: Jan 2005
Location: Las Vegas, NV
Posts: 488
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my wag is
a sticking exhaust valve on #2. I would do a wobble test and make sure my push rods on #2were still straight...
Great job getting her down. How did your passenger react?
__________________
Terry F.
RV 7A N457RV
250 hours and lovin it! 
Southern Nevada EAA Chapter 1300 - www.eaa1300.org
Paid VAF 03/17
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12-26-2012, 08:03 AM
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Join Date: Dec 2006
Location: Coventry. England
Posts: 614
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Cool head
Hey,
Well done keeping a cool head and making the best of a bad situation!!!
__________________
http://www.aerobuilder.blogspot.com
Steve Arnold
England
In completion stage of Loehle P5151
Built and now Flying G.BVLR Vans RV4
Rebuilt G.BDBD Tailwind
Rebuilt G BVTN Kitfox
Built G CDCD RV9A with WAM120
Riveted wings on Glastar G.LEZZ Now (G. SKUA)
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12-26-2012, 08:04 AM
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Join Date: Aug 2005
Location: Dallas/Ft Worth, TX
Posts: 5,687
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A little rough and high EGT may also indicate you are losing ignition to one plug. First thing I would do is check wires, connections etc. and replace plugs on offending cylinder.
__________________
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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12-26-2012, 08:27 AM
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Join Date: Jul 2007
Location: Delta, CO/Atlin, BC
Posts: 2,391
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Glad you're safe. I think the default on the Dynon is to record data (I don't remember the interval but somewhere between 1 & 5 seconds probably), so you should be ok.
Cheers,
Greg
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Greg Arehart
RV-9B (Big tires) Tipup @AJZ or CYSQ
N 7965A
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12-26-2012, 08:48 AM
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Join Date: Jul 2005
Location: Lee's Summit, MO
Posts: 99
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Seen this before
Scott.
In fact, seen it twice on a friends IO-390. After pulling plugs on the problem cylinder, a chunk of carbon was found bridging the gap.
BeeGee
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12-26-2012, 08:49 AM
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Join Date: Dec 2004
Location: Gold Hill, NC25
Posts: 2,400
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A cylinder miss & rising egt should be no cause for alarm or need for a cool head. Pulling power, pushing the nose over and dropping flaps and heading back to the runway really kept you from determining what the problem was. There was more sleuthing to do.
There are a number of items that could be the cause as others have mentioned.
Perhaps its the way you wrote the issue, but I got far more concerned about the reaction than I did the problem while reading. Even a completely out cylinder, while feels terrible, is no cause for 'I have to get down now'. Let it stumble, climb and access.
A nice pattern while troubleshooting would help pinpoint the problem. You could simply have a fouled plug, bad plug, intake leak, ign wire, plugged injector, or a number of other items. Some of these are difficult to troubleshoot on the ground.
__________________
Kahuna
6A, S8 ,
Gold Hill, NC25
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