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Ideal AF ratio on a NA motor?

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Old 12-02-2006, 09:40 PM
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Default Ideal AF ratio on a NA motor?

what seems to be the best for making the best power? Timing also .
Using Texas speed 402 with prc 3 heads
Old 12-02-2006, 10:34 PM
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i think safe would be 12.5ish
Old 12-02-2006, 10:58 PM
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Usually close to 13:1 but not quite all the way.

The books will say 12:1, but closer to 13:1 will make more power, closer to 14:1 will make less power.

All of us who have been around dyno's will say somewhere close to 13:1.
Old 12-03-2006, 12:27 AM
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Originally Posted by Big-DEN
Usually close to 13:1 but not quite all the way.

The books will say 12:1, but closer to 13:1 will make more power, closer to 14:1 will make less power.

All of us who have been around dyno's will say somewhere close to 13:1
Each motor based on cubes and compression ration is going to be different but I agree with the above as a general rule. however, usually the bigger cubed LSX motors like a little more fuel around 12:5 to 1!!
Old 12-03-2006, 01:07 AM
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A lot of folks say to go for ~12.5:1 because the car will run leaner on the street than on the dyno.
Old 12-03-2006, 04:10 AM
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the best AFR/spark is the one you get by testing on a steady state dyno.
Old 12-03-2006, 03:36 PM
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Thank you guys , you summed it up for me



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