PSI to Compression relation

[emiliano22]

I have a new 400ex and I don't now if it have the stock compression relation. It have 145 PSI of compresion at sea level.

Is there any mathematical equation to calc the compression relation?

Did someone test your pressure with a high compression piston?

[barbwire44]

Take you're 145 psi x3.1789+1.01 x 6%(8 x 8)CFM*.264 - by the piston size in milimeters take into consideration the 2-8% ring wear and you should be right on the money.:D

[beerock]

WHAT?:blah

[Guy400]

Originally posted by barbwire44
Take you're 145 psi x3.1789+1.01 x 6%(8 x 8)CFM*.264 - by the piston size in milimeters take into consideration the 2-8% ring wear and you should be right on the money.:D But it would help if you removed your shoes that way you could keep track of the connecting rod velocity coefficient on your toes:D

[emiliano22]

Really thanks for your help.
Maybe the formula is too complicated for my abaco but I think all the shoe thing can help to a correct measure :huh

:D