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Re: [Healeys] How Fast Does My Drive Shaft Spin??

To: "'Mark J Bradakis'" <mark@bradakis.com>, <healeys@autox.team.net>
Subject: Re: [Healeys] How Fast Does My Drive Shaft Spin??
From: "Skip Saunders" <tfsbj7@mindspring.com>
Date: Wed, 10 Jul 2013 17:45:06 -0400
Delivered-to: mharc@autox.team.net
Delivered-to: healeys@autox.team.net
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References: <453166E2-9576-4EA7-871B-618B07ED202E@gmail.com> <51DDD1C5.6000600@bradakis.com>
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Yes indeed....that is exactly why the speedometer cable takeoff is from the
back end of the overdrive...

-----Original Message-----
From: healeys-bounces@autox.team.net [mailto:healeys-bounces@autox.team.net]
On Behalf Of Mark J Bradakis
Sent: Wednesday, July 10, 2013 5:28 PM
To: Healey List
Subject: Re: [Healeys] How Fast Does My Drive Shaft Spin??

Price Lindsay wrote:
> I am trying to install cruise control in my car and need to know the 
> rate of spin of the drive shaft on a BJ8 while in overdrive?  I'm 
> looking for the number of revolutions per mile. This is a stock car 
> with stock tires, rear end, transmission and over drive.
>

The revolutions of the driveshaft per mile will be the same regardless of
what gear the transmission is in.  There are various tire size calculators
out there, you need to find the revolutions per mile for your size tire,
then multiply that by the final drive ratio to get the driveshaft speed.
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