When excessively leaning the mixture of a piston engine for a better fuel economy, but still on the rich side of the peak EGT, which of the following engine parameters may exceed their normal operating range?
Because the leaning procedure consists of adjusting the mixture by reference to the CHT, you might inadvertently lean too much the mixture. If the mixture is too lean you will not have enough fuel to act as a cooler for the cylinders and their CHT might exceed the normal operating limits. The exhaust gas temperature might also be out of limits since the mixture is leaned enough to still be on the rich side of the peak EGT, which means that a lot of energy from the fuel will be wasted.
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