2007-2008 Polaris IQ Snowmobiles Service Manual, Page 50Get this manual
General Information ENGINE DATA FORMULAS
Compression Ratio
R= (IHVDISP) IHV I= (DISP 25.4)
DISP(PI S) 4
IHV= INSTALLED HEAD VOLUME (cc) DISP= CYLINDER DISPLACEMENT (cc) R= COMPRESSION RATIO S= FULL ENGINE STROKE (cm) I= INCHES PER cc OF IHV B= CYLINDER BORE (cm) PI= 3.1416