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Bryan Allsop
Joined: 29 Jun 2007
Posts: 78
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 Posted: Sun Oct 16, 2011 9:26 am Post subject: 912S Rough Running at High Revs |
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Restoring the Mono’s undercarriage involved removing and replacing the engine. Subsequent flight checks were excellent, and I was really pleased with the job.
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The very next flight was a different story. High power settings produced a disturbing engine flutter and a loss of some power. Ground checks confirmed the fact, and a variety of attempts were made to solve the problem. All without success! If anyone else has experienced the same and has the answer please let me know.
The symptoms;
1. Engine starts and ticks over very nicely. Mag. checks OK.
2. Fuel pressure is good.
3. 2500 rpm. Smooth running. No noticeable difference on mag. checks.
4. 4000 rpm. Fluttering becomes apparent. More pronounced on one mag.
5. 5000 rpm. Fluttering is obvious. Again more pronounce on one mag.
Checks so far;
1. All spark plugs replaced.
2. All wiring and leads checked.
3. Valve covers off, and valves, seating, collars etc. Checked.
4. Connections to engine management switched. Mag. symptoms switched with it.
5. Carb settings checked for full opening and closing.
There is a possibility that the ignition is not advancing. Is there a simple way to define that?
Thanks in anticipation.
Bryan
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tennant
Joined: 19 Apr 2011
Posts: 121
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| Posted: Sun Oct 16, 2011 11:00 pm Post subject: Re: 912S Rough Running at High Revs |
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Bryan,
Check your fuel system for air ingress.
I had similar symptoms many years ago. Impossible to find, until I fitted a clear plastic pipe to one of the carb feed tubes. I found that although there was no obvious leak lots of air was getting into the fual supply, enough that the engine ran weak at high load. New hoses and decent clips solved it.
Barry Tennant
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_________________
Barry Tennant
D-EHBT
At EDLM - Germany |
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