Sorry, but I'm not following the math here. Atmospheric pressure is 14.7 psi
(at sea level) so a compression ratio of 8.5 should yeild appx. 125 psi.
Assuming I'm missing something, can anyone splain what it is?
Terry Coll '64 BJ8
> From: glemon@neb.rr.com
> To: jmnewt@comcast.net; healeys@autox.team.net
> Date: Tue, 1 Dec 2009 17:56:21 -0600
> Subject: Re: [Healeys] 4 Cyl Compression Measurement
>
> For what it is worth when I rebuilt my 100 engine with .060" over 8.5/1
> pistons and Le Mans cam I got readings in the neighborhood of 165-170 psi
> across the four.
>
> At 8.0/1 I would assume you owuld be slightly lower but in the ballpark, I
> would think maybe in the 145-160 psi range with little variation from
> cylinder to cylinder (I forget what is considered acceptable 2-3%, or maybe
> 5 psi or so on a rebuilt motor?) would be in the ballpark.
>
> Greg Lemon
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