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fuel injected lean burn cars go into the lower 20s but the neat thing about that is the exhaust temp actually drops once you cross a certain threshold.
they explain it a little in the article frank posted. the engine will run hotter closer up to about 18:1. but once you cross a threshold the exhaust temp drops, the downside is power loss. losing 20 horsepwer in a car on the ground while entering lean burn-not a big deal, many of us on this site drive lean burn cars many miles every day. losing horsepower in an airplane mid flight- not so fun. thats why he explains how to lean the engine out mid flight until the engine starts to sputter then richen it back up so it still has power but is at its leanest possible setting.
of course we are talking about carbureted cars and this is more difficult to achieve as compared to injection. with a carb you are going to be starting at the factory base point and dropping jet sizes, retarding timing, driving, repeat. would take a half a day to do or more where as with fuel injection and a laptop it could take just a couple hours. an even more involved route would be putting the distributor on a curve machine and custom weighting it. and/or installing the timing knob that msd makes.
i like this thread. got me thinking alot
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Burn lean and prosper \\ //
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