How do you calculate compression ratio?

[Tri-ZNate]

For my sno-runner the stock compression ratio is 7.43:1. But I put a high compression gasket in there and would like to know how to calculate my new total. Bore is 63.8mm X Stroke which is 41.1. New gasket is .032 compared to stock which is .094 if it makes a difference.

[phreakboy]

I cant really answer your question, but you will have to tell me if it makes a big difference or not and did you get the exhaust? I just had the one thats for sale out playing today, it was so much freakin fun.

[3 weelin geezer]

I would say its how much you get when you take a pressure reading and divive that by the 'normal' pressure at sea level which I think is 14.7 lbs. Ny atc 185s gets around 150 psi. Or you have to know what the volume of the head is plus the gasket plus the space between the piston to the gasket compared to when its at the bottom of the stroke.

[Tri-ZNate]

no i didnt get the exhaust. It was just too much money. The only thing I have on is the .032 gasket, I threw the .062. Still waiting on my clutch for christmas too.