| Non-GMC engine question [message #88987] |
Thu, 17 June 2010 11:54  |
Ken Burton
Messages: 10030
Registered: January 2004
Location: Hebron, Indiana
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Last night on the way home I noticed one of my airplane cylinders was running 1642 degrees EGT. It got my attention to say the least as I was about 1 hour from home well after dark which limits your landing options in case of an emergency.
I have never seen an EGT over 1520 or so. Adding carb heat decreased the reading by about 75 degrees but that was still higher than I have ever seen before. The interesting thing is the CHT was the same on that cylinder as all of the rest which was around 340 degrees. Oil temperature was also in the green.
I was running full rich at about 3500 feet with an OAT of 72 degrees. This is a carburetored non-turbocharged 87 octane O-320 engine.
I have always thought from past leaning experiences that 1500 degrees or slightly higher was the theoretical limit on 100% non-turbo gasoline powered engines.
I'm thinking and hoping that this is simply a bad probe.
Note: I also intend to run a differential compression test on the cylinder in question in the next couple of days.
Is there anyone out there that has any knowledge on this subject?
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana
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