June 2014- Traditionally, a pilot has had one EGT gauge and one CHT gauge that he or she would use to keep track of the performance of an engine. The aircraft's manufacturer determined the probable location of the hottest running cylinder, placed a single probe there and then screwed an EGT probe into the exhaust pipe a few inches downstream from where the exhaust pipe joined the exhaust manifold. The theory was this: if you lean the engine by reference to what is normally the hottest cylinder and the exhaust temperature, you won't fry any of the cylinders or over-lean the engine.
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