71velle
Aug 23rd, 99, 6:11 AM
Given the tire diameter, rear end gear ratio and the engine RPM, what is the formula for calculating MPH ?
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Tom Kordick Aug 23rd, 99, 7:03 AM check out this site http://mindspring.com/~johnbolton/mphrpm.html ------------------ Pat Kelley Aug 23rd, 99, 7:35 AM Try this one http://www.chevelles.com/shop/programs.shtml ------------------ Pat Kelley 66 & 67 El Caminos michael j Aug 23rd, 99, 12:01 PM 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 ------------------ ??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).] 71velle Aug 23rd, 99, 1:39 PM So, let me do the math here....27" diameter tire, 4.11 rear at 8000 RPM is 156 mph. WOW! chev-hell Aug 23rd, 99, 7:37 PM 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 ------------------ Current picture of car in paint shop members.aol.com/jnkb2cool/chevelle2.jpg (http://members.aol.com/jnkb2cool/chevelle2.jpg) John Krenn Ft.Worth, Tx | ||