Quote:
Originally Posted by R Bedell
First, think of the Air/Fuel mixture ratio as the extra gasoline (running rich) cools the combustion chamber down. Running lean offers no cooling effect.
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This, I used to fly and Cessna and Piper engines are the same way. If you start overheating, you are too lean. The little extra fuel vapor added by riching the fuel/air ratio will cause a cooling effect in air cooled engines.