| On 11 Oct 1997, Mark Stahlke wrote:
>    Sounds like a reasonable theory. I can measure atmospheric pressure with a
> barometer. Anyone know how to convert inches of mercury or millibars to pounds
> per square inch?
$ units
You have: mbar
You want: psi
        * 0.014503774
        / 68.947573
You have: in Hg
You want: psi
        * 0.49115415
        / 2.0360207
You have: ^D
$
                     
Problem with your theory is that you seem to get a higher pressure from
the compression reading than you get by multiplying the atmospheric
pressure by the compression ratio. For instance, my 10:1 compression
engine gives a reading of around 180 PSI. 
Egil
-- 
Email: egil@kvaleberg.no Voice: +47 22523641, 92022780 Fax: +47 22525899
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