Well not to shoot holes in your theory but a MSM is 9.5 compression and the manual says that the normal PSI for compression should be 209. Larry White Knight 1991 Crystal White #99 CSP Silver Bullet 1992 Silverstone #17 SM2 FM I+ Turbo Honey B 1992 Sunburst Yellow #99 SM2L JR Supercharger Whooosh 2004 Titanium Mazdaspeed MX-5 LowCountry Miata http://www.lowcountrymiataclub.net Masters Miata RAGS 074 From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of [EMAIL PROTECTED] Sent: Monday, October 27, 2008 4:41 PM To: [EMAIL PROTECTED] Cc: [email protected] Subject: Re: NMC - How to figure "perfect" compression for a compression check? AHA:
"alternatively multiply the compression ratio by 20 if you want to work in psi" So, what is a stock Miata, 9.5:1, right? x20 = 190psi... That jive with what everyone has seen? That means the LT1 would be 10.4 x 20 = 208psi... Wallyman Inactive hide details for Ashraf Farrag <[EMAIL PROTECTED]>Ashraf Farrag <[EMAIL PROTECTED]> Ashraf Farrag <[EMAIL PROTECTED]> 10/27/2008 04:16 PM Please respond to [EMAIL PROTECTED] To [EMAIL PROTECTED] cc [email protected] Subject Re: NMC - How to figure "perfect" compression for a compression check? Math and Physics? :) Compression numbers are a pressure - lbs/sq in. You should be able to work backwards from there to the basic fluid dynamics of a pump to determine what the perfect pumping efficiency would be of each cylinder. Top result from googling "calculating engine compression pressure" gets you this: http://www.cavweb-forums.co.uk/showthread.php?t=71683 Regards, --Ashraf
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