thecruzs2007@yahoo.com

so ive been wondering these for the longest and i kinda have an idea for it but i wanna know more...so my question is.. wat does it mean for example compression ration of 10:1?

93egSLEEPER

The compression ratio of an internal-combustion engine or external combustion engine is a value that represents the ratio of the volume of its combustion chamber; from its largest capacity to its smallest capacity. It is a fundamental specification for many common combustion engines.

In a piston engine it is the ratio between the volume of the cylinder and combustion chamber when the piston is at the bottom of its stroke, and the volume of the combustion chamber when the piston is at the top of its stroke.[1]

Picture a cylinder and it's combustion chamber with the piston at the bottom of its stroke containing 1000 cc of air (900 cc in the cylinder plus 100 cc in the combustion chamber). When the piston has moved up to the top of its stroke inside the cylinder, and the remaining volume inside the head or combustion chamber has been reduced to 100 cc, then the compression ratio would be proportionally described as 1000:100, or with fractional reduction, a 10:1 compression ratio.

higher compression ratio on a non forced induction motor means more power.... it creates a stronger "explosion" causing more power. lower compression is desired for forced induction though