Cam duration will have a big effect on compression numbers. Think about it, valve is still open as piston goes up on comp stroke, there goes your math. About all you can do is ask other people with the same engine what their numbers are. And comp gauges vary all over in their relative crapitude. Bill Cardell TurboDog's Dad www.flyinmiata.com www.fmwestfield.com orders 1-800-FLY-MX5S Before you call our tech line (970.464.5600) please check out the FAQ <http://www.flyinmiata.com/FAQ/> section of our website
________________________________ From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Larry Alster Sent: Monday, October 27, 2008 2:50 PM To: [EMAIL PROTECTED]; [EMAIL PROTECTED] Cc: [email protected] Subject: RE: NMC - How to figure "perfect" compression for a compression check? 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 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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