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isn't 12.7 still a little lean though? (archive)
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Posted by IK632 on October 01, 2001 at 11:30:51:

In Reply to: Re: OT: A/F Optimal/Max power....>>>> posted by Ray Bahr on September 30, 2001 at 22:50:59:

I know in a few other car's we worked on 13.1 yielded good power. 12.7 was getting a little lean. I would rather run a little rich and not worry about grenading the engine. But you are right about the max power. You just have to put the car on the dyno and do a few runs to see what that car likes the best while keeping a reasonable a/f ratio.


An A/F of 14.7:1 is optimal for Catalytic Converters - nothing else. 12.7:1 will give you max power.

Ray

Just making sure I have this right... optimal A/F is 14.7:1, and Max Power is @ .86 multiplier? about 12.7:1 or so?

Thanks,

Boris

Got another question, while at it.... if 14.7 is optimal, then why is running a bit more rich (and ONLY with the .86 multiplier be the max power output?) Any engineers out there?

Thanks.





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