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#1
02-25-2009, 01:42 PM
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Today I Learned Something Interesting About Air Colling
My motor has two cooling fans. The motor instruction manual makes it clear the engine needs air flow.
Yesterday I replaced a rubber receiver that the air filter seats into and which sits atop the cylinder. A crack in the rubber was allowing air in and my EGT was high. Replaced, tested.... 100F lower. Yeah! Go to fly this morning and I get a warning light! WTF how can this be!??? Rechecked retightened etc. Come to find out that by positioning my motor so it had a brisk wind coming at it from the rear (the wind is 97 deg F) I was defeating the fan! I turned the machine so the wind was coming toward the engine (as it would in flight) and bingo back to normal! Interesting lesson not found in a book.
__________________
To be born free is an accident, to live free is a privilege, and to die free is a responsibility. 
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#2
02-25-2009, 02:10 PM
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Try flying with a foot on either rudder pedal and see if you can cool off one side or the other in a sideslip.
Make sure that the fan guards are tight, they have been known to go through the prop and do ugly things.
__________________
The government cannot give anything to anybody that the Government does not first take from somebody else. “I prefer dangerous freedom over peaceful slavery.” - Thomas Jefferson Scott Essex....Flying H Ranch
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#3
02-25-2009, 03:04 PM
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Thanks Rob, one more great tip to help us all diagnose future problems.
__________________
Resistance is futile…… You will be compiled!  Cheers, John Rountree  PRA- Webmaster and Volunteer Coordinator U.S. Agent for Aviomania Aircraft See: Aviomania USA http://www.AviomaniaUSA.com
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#4
02-25-2009, 06:00 PM
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Wha?
Quote:
__________________
To be born free is an accident, to live free is a privilege, and to die free is a responsibility.
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#5
02-26-2009, 02:25 AM
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Well if you lost a fanbelt, you might be able to keep the one side cool and limp home, or at least buy a little time picking a landing spot instead of seizing the engine. Will it work? I don't know.
__________________
The government cannot give anything to anybody that the Government does not first take from somebody else. “I prefer dangerous freedom over peaceful slavery.” - Thomas Jefferson Scott Essex....Flying H Ranch
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#6
02-26-2009, 11:10 AM
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Today I went to fly and one of my CHT was through the roof on start up... and I was facing the right way. Back to the barn! In that after the engine was cooled I was getting readings of 65 65 65 360..... im thinking I might have a bad sender to my EIS. I ordered 4 new ones and will just replace them all and hope for the best. When I asked the factory rep which was the #1 cylinder he said it depends on which sender they hooked where.... so now I need to test using a match to see which one reacts where.
As they say here in the south....OY!
__________________
To be born free is an accident, to live free is a privilege, and to die free is a responsibility.
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