 Formulas for racers and engine builders...
Lately I've seen many threads asking the same questions... how much power, what size carb, rear wheel hp, and I've done some research about these and have found some useful information. These are all formulas that professional engine builders use, and can be applied to all engines regardless of how many cylinders or configuration you may have.
HORSEPOWER:
HP = torque (ft lbs) X rpm
..................5252
DISPLACEMENT:
CID = bore X bore X stroke X .7854 X number of cylinders
REAR WHEEL HP CONVERTED TO FLYWHEEL HP:
rear wheel hp = flywheel hp
.......80
TORQUE:
torque = horsepower X 5252
......................RPM
CARBURETOR SIZE:
carb cfm required = CID X maximum engine rpm
........................................3456
SAE/METRIC CONVERSION:
.061 cubic inch = 1 cubic centimeter
ESTIMATED HORSEPOWER BASED ON CYLINDER HEAD CFM:
HP = .2575 X CFM (at 28" of water) X number of cylinders
ESTIMATING HORSEPOWER AT THE DRAGS:
horsepower = weight X .4 X 1/4 mile MPH
.................................282
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Last edited by EagleAutosports; 11-09-2007 at 11:04 AM.
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