[Healeys] 4 Cyl Compression Measurement

[Richard Ewald]

Don't forget that everyone assumes their compression gauge is accurate.  The
truth is it could be off by who knows how many PSI.
I've seen two gauges disagree on the same engine by more than 20lbs.
With that in mind, I am more interested in how even the readings are from
hole to hole than I am in the absolute number.
Rick

On Wed, Dec 2, 2009 at 1:26 PM, Bob Spidell <bspidell at comcast.net> wrote:

> Found a link:
>
> http://en.wikipedia.org/wiki/Compression_ratio
>
> Look at: " Fault finding and diagnosis"
>
>
> bs
> --------------------------------
> Bob Spidell - San Jose, CA
>
>
> Compressing a gas causes it to heat and (try to) expand, raising pressure
> beyond nominal.
>
> There are formulas for computing the total compression, but I'm to lazy to
> google it right now.
>
>
> bs
>
> --------------------------------
> Bob Spidell - San Jose, CA
>
>
>
> 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?
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