How old is the AFR meter sensor? The lead in race gas damages the sensor and it loses accuracy.
Quote:
Originally Posted by r lane
I am running an AFR meter and see high 11s to low 12s. 110 race fuel. The piston build sheet says the dome is 47.5 cc which should give me a little over 12 to 1. They I think were basing that on a 87.6 cc head. My heads are 86.6, I measured them. I calculated the dome as 48.9. By the time I removed material from the valve pockets and small relief for the plug tips, my dome was down to 47.34cc. Approx 12.09 to 1.0. So far as depending on the speculative additional HP numbers I wasn't. Not that it wasn't a potential improvement over what I had, but what I had was an unknown in terms of its flow numbers. Bob
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