compression confusion

[topoortorideon4]

Im still not too firmilliar with compression and was wondering what is stock and what is high compression like •Compression: 12:1 or •Compression: 10.25:1 im not sher of the difference in the compression these are # 's for the honda 200 m and stuff

[ebecme01]

It is a ratio between the volume of a combustion chamber and cylinder when the piston is at the bottom of its stroke, and the volume when the piston is at the top of its stroke. The higher the compression ratio, the more mechanical energy an engine can squeeze from its air-fuel mixture.

Just so you know, you can get the exact data from a ATC repair manual.

A stock 200M would be between 8:1 and 8.5:1

A 200X is around 9.6:1

the higher the compression ratio, the more power you will have.

a stock 200M will have a small concave or "dished" area in the top of the piston

a 200X piston is flat or has a small dome in the top of the piston or "domed"

thats the only difference

[topoortorideon4]

alright i sort of am understanding it thanks for the help