June 2011 Issue

The Red Knob II: Where To Put The Mixture

Whether we run our engines on the rich or lean side of peak EGT, what we really want to do is avoid high internal cylinder pressures.

Pilots are famous for arguing the finer points of various procedures they employ when flying. In recent years, few topics have generated more "discussion" and disagreement than when and how to lean a gasoline-fueled piston-engine’s fuel mixture. A previous article ("The Red Knob," April 2011) explored the benefits of modern multi-cylinder engine monitors, closely balanced fuel flow between all cylinders of an engine and the effects leaning from full rich have on parameters like exhaust gas temperature (EGT), internal cylinder pressure (ICP) and cylinder head temperature (CHT).

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