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Discussion Starter · #1 ·
Given the tire diameter, rear end gear ratio and the engine RPM, what is the formula for calculating MPH ?
 

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This equation is for 4sp, in 4th gear at 1:1 ration. Crankshaft turns once: Drive shaft turns once.

G = final gear reduction (differential)

d = diameter of wheel

pi = 3.14159

(2 * pi * (d/2))
------------------ * RPM = MPH
G * 1056

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??michael j Team Chevelle Gold #77
70 Chevelle SS396 4sp, Fathom Blue/White Stripes - Canadian built

[This message has been edited by michael j (edited 08-23-99).]
 

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there is a good calculator that has tranny infor tire size etc. you can download it for free i did and it's neet shows rpm's etc called Autodyne rpm calculator can't remember where i got it. found it Http://pages.prodigy.com/gears

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Current picture of car in paint shop members.aol.com/jnkb2cool/chevelle2.jpg John Krenn
Ft.Worth, Tx
 
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