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Re: Speedo Formula

To: "Dean Swanson" <d.swanson@earthlink.net>, <spridgets@Autox.Team.Net>
Subject: Re: Speedo Formula
Date: Tue, 9 Nov 2004 17:48:48 -0600 reply-type=original
References: <000001c4c6b3$4eff0d00$f2e58818@S0029514436>
Dean.... ask any Bonneville guy and we can get you there pretty quick..

if you take the tire height in inches and mulitply it by the engine RPM .... 
take that number and divide it by the rear gear ratio and then divide it by 
336 you will get VERY VERY close to the exact mph....

for example.... 8000rpm X 28" tall tire = 224000  divided by 336 = 666.666 
divided by 3.0 gear ratio = 222mph

If you have an overdrive continue to divide it by the OD ratio... in my case 
that's .85  which equals... 261mph.... my exact speed at Bonneville this 
year by the way....

Data log tells me we maintained.... 8000rpm for the mile.... Dah Daaaa

Keith 





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