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Old 09-05-2007   #1
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Air fuel ratio

What is the ideal air/fuel ratio? I've heard figures like 10 parts air, 1 part gas. Is this correct? What is the air/fuel ratio given off by a completely stock engine?
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Old 09-05-2007   #2
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Re: Air fuel ratio

14.7:1 is complete combustion (everything is expended). You dont want to run that high under load, as you want some factor of safety set into the system, NA, I think you could get away with High 12s at WOT, under boost, you want mid 11s
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Old 09-08-2007   #3
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Re: Air fuel ratio

So complete combustion is 14.7 parts air and 1 part gas. But idealy, you want 12 parts air and 1 part gas at WOT (wide open throttle)?
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Old 09-08-2007   #4
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Re: Air fuel ratio

For boost or NA?
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Old 09-08-2007   #5
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Re: Air fuel ratio

Both
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Old 09-28-2007   #6
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Re: Air fuel ratio

12 anything :1 is uber rich. You won't make power that rich. I'd say mid-high 13's would be good under n/a apps. Mid-low 11's is ideal for boost, gives a good cushion of safety.
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Old 09-28-2007   #7
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Re: Air fuel ratio

12's:1 on an N/A all motor app should be fine. That will allow for some buffer of bad gas and top end runs.
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Old 09-28-2007
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