K Kart43 Member Nov 12, 2013 #2 You need more than that. HP = Lb/FT * RPM / 5252 So you will need to know the length of lever the force (pounds) is acting on, at a given RPM and then divide by the constant 5252 (which we wont explain in a sentence)

You need more than that. HP = Lb/FT * RPM / 5252 So you will need to know the length of lever the force (pounds) is acting on, at a given RPM and then divide by the constant 5252 (which we wont explain in a sentence)

P Performancedirect New member Nov 13, 2013 #3 Does your dyno have a gallon per minute gauge? If so you can use this formula. Psi x GPM divided by 1400.

Does your dyno have a gallon per minute gauge? If so you can use this formula. Psi x GPM divided by 1400.