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Re: [Healeys] 4 Cyl Compression Measurement

To: TERRY COLL <coll44@msn.com>
Subject: Re: [Healeys] 4 Cyl Compression Measurement
From: Bob Spidell <bspidell@comcast.net>
Date: Wed, 2 Dec 2009 21:26:42 +0000 (UTC)
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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