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The Read For SpeedSuperCar NedHeadsRolling Thunderz EnginesSpeed SuppliesPower SystemsAbout Rolling Thunderz
THE READ FOR SPEED by Ned Erkman
CHAPTER 6

RPM Formula

The formula for calculating rpm can be used to select the best rear axle gear ratio and rear tire diameter for a desired rpm and mph.



Gear Ratio Formula

The formula for determining the required rear axle gear ratio for a specific tire diameter, engine rpm and mph can be calculated as follows:



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Ned Erkman
Author of The Read for Speed
Copyright © 2005 The Read For Speed. All Rights Reserved.
Reproduction in whole or in part without expressed written permission from the author
is strictly prohibited.

power
Performance Principles of Power & Acceleration
Performance Power of Cylinderheads
Intake Manifold Power Production
Camshaft Power Production
Mathmatical Formulas
Power Calculations from Flow Bench Testing of Intake Air Flow
Engine Air Flow Requirement Calculations
Horsepower to weight formulas
Horsepower requirements for mph
Horsepower requirements for et
Engine size calculations
Piston Speed - Crankshaft Stroke
Horsepower to weight formula
RPM Formula - Gear Ratio and Tire Diameter
Engine Development

Call 416 988-0018 or e-Mail Ned Erkman

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