2007-2008 Polaris IQ Snowmobiles Service Manual, Page 50Get this manual
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General Information ENGINE DATA FORMULAS
R= (IHVDISP) IHV I= (DISP 25.4)
DISP(PI S) 4
IHV= INSTALLED HEAD VOLUME (cc) DISP= CYLINDER DISPLACEMENT (cc) R= COMPRESSION RATIO S=