Originally Posted by
kair1234
Ever since I learnt about ground leaning I have done it.
Use ground leaning to prevent fouled plugs. If you read anything about engine care you will learn to never burn a plug off if you get a bad mag drop. The reason for this is because engines have nowhere near as much cooling airflow on the ground as in the air and so all you are doing is heating the engine up excessively, and if you arent careful you will heat it to dangerous levels.
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Running the engine lean on the ground will actually cause a HIGHER engine temp. The effect of a rich mixture is to provide cooling!
I would suggest a reference to your partular aircraft's flight manual would be prudent. I can not believe that schools are teaching to run their aircraft at full rich in flight - it not only is bad for the engine but degrades the aircraft's performance as well.