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Old 11-09-2012, 03:53 PM   #37
ecbmxer
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If we're still talking about the OP's statement, I think it's the difference between best in theory and best in practice. I haven't read that book, but the theoretical "best" AFRs are probably based on some ideal calculations of in-cylinder pressure or heat release. It may not even take into account using a liquid fuel and all the complex mixing that goes on (lots of times iso-octane and n-heptane are used in place of gasoline or diesel in numerical calculations). I would trust the advice/experience of the known tuners who commented above over theory of a generic engine (unless he has some nice CFD models with reacting flow and heat transfer).
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