A Studebaker Reference Guide

Formulas

These are general automotive formulas:

 Result Formula Displacement 3.14 * R(squared) * S * C Where as R = radius (1/2 diameter) of the bore; S = Stroke; C = The number of cylinders. Simpler formula for displacement B * B * .7854 * S * C Where B = Bore; S = Stroke; C = Number of cylinders. Engine CFM (engine RPM / 2) * (engine displacement / 1728) Another CFM formula is maximum engine RPM * (cubic inch displacement / 3456) Compression Ratio displacement of 1 cylinder / volume of 1 combustion chamber Volume displacement of 1 cylinder / compression ratio To convert cc's into cubic inches Multiply by .061 Piston Speed Should be in the 4,000 to 4,500 per minute is about the limit RPM * stroke / 6 Miles Per Hour (RPM * T) / (R * 168) Where T = 1/2 the tire diameter; R = Rear end ratio Axle Ratio Count the number of revolutions the driveshaft makes to turn the tire once. If only one tire is jacked up, count for two tire revolutions.

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