Page 28 Engine Data Management
The following pages provide step by step guidelines in leaning your
engine, for both rich of peak and lean of peak modes:
As the mixture is leaned, EGT rises to a peak temperature, and then
drops as the mixture is further leaned. Peak power occurs at a mixture
using more fuel than a mixture set to best economy. Best economy
occurs closer to peak EGT than best (peak) power. Consult your engine
manufacturer’s manual for your best power and best economy settings.
Accurate leaning yields optimal engine temperatures. By being able to
precisely adjust the mixture, your engine can produce either the best fuel
economy or maximum power, whichever you choose.
A single EGT gauge merely gives you an average of a few
cylinder’s temperature: some cylinders can be too rich, while others too
lean. Variations produced by differences in fuel distribution, ignition, and
compression will cause each cylinder to peak at a different temperature.
In some cases the coldest cylinder will peak first. TIT will run up to 100
degrees hotter than the hottest EGT.
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