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Re: Compression Ratios

To: Shop Talk <shop-talk@Autox.Team.Net>
Subject: Re: Compression Ratios
From: "Peter J. Thomas" <pjthomas01@snet.net>
Date: Fri, 27 Mar 1998 10:12:51 -0500


Peter J. Thomas wrote:

> Ok, here is where I show my stupidity.
>
> Bought my first compression guage.  It is calibrated in psi.  How do I
> determine the compression ratio? Ie. how do I convert  x psi to n:1?
>
> Peter Thomas

  Thanks for all the replies.  I suspected much of the theory but didn't
have anyway to confirm it.  Even if the was a little magically formula, I
doubt the cheap little gauge is that accurately calibrated.

Just as a follow up, the car I was testing is a 91 Ford Tempo with a
compression of 9:1.  The readings I got were 135, 140 130, 125.  There is
a 15 psi (11%) difference between cylinders 2 and 4.  Probably not worth
worrying about.  This did confirm my suspicions about cylinder 4, but it's
not that bad.

Thanks again,

Peter Thomas



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