Head compression question...

[jester]

What will the increase in compression be if I swap my 118cc heads for some 101cc heads all else remaining equal? Thanks, Jester

[kevnmcd]

Jester-Are these numbers chamber size or intake runner sizes? If they are intake sizes it won't change your compression ration. It is the combustion chamber size that determines the compression ratio. Some typical combustion chamber sizes are 67, 72, 76 cc's.
Kevnmcd

[jester]

Perhaps I should have been more specific, I'm refering to combustion chamber sizes on a BBC. For example, I know I'm around 9.5:1 now what will the head swap change this to, 11:1?

[kevnmcd]

Jester-That makes since...I get stuck in my SBC mode sometimes http://free.***boat.net/ubb/smile.gif Try out this website, it will answer your question.
http://www.angelfire.com/fl/procrastination/motor.html

[jester]

Thanks, that's exactly what I was looking for!