Quote:
Originally Posted by R 70 Judge
Is there a calculation for this? How many lbs of spring pressure would you effectively lose with a 2.20" valve at 10lbs of boost?
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The way I understand it...(please correct me if someone has different info)...
2.2valve = 3.801215 sq inches. 10 pounds square inch boost x 3.801215 sq in = 38.01215 lbs above atmospheric pressure pushing against the valve. Its probably a tid less as I didnt subtract the area the valve stem occupies Probably valve shape and other factors somewhat affect the actual loading. But in this example I'd want to use a spring with 35-40 more pounds open pressure above what would be suggested for an NA motor.