Formulas - Polaris 2003 Pro X Service Manual

ENGINE
R = (IHV+DISP)
I =
(DISP*25.4)
DISP = (PI*B*B*S)
Bore = 6.5 cm.
To calculate the Effective Compression Ratio, substitute the exhaust port height for the stroke in the
formulas above:
Eff Comp =
Eff Comp = 6.725
In order to increase the Full Stroke Compression Ratio to 13.6, how much material do you need to
remove from the cylinder head?
R =
You know that:
Displacement = 199.098 cc, and we want R = 13.6, so then
IHV2 =
IHV2 = 15.801 cc desired IHV to have 13.6:1 Full Stroke Compression Ratio
2.4
IHV
S
4
Stroke = 6.0 cm.
Displacement = Bore
Displacement = 199.098 cc
IHV + Displacement
R =
IHV
Full Stroke Compression Ratio
R = 12.643
Exhaust = 2.95 cm.
Eff Disp = Bore Stroke
Eff Disp = 97.89 cc
IHV + Eff Disp
IHV
IHV + Displacement
IHV
Displacement
(R -- 1)
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
IHV = 17.1 cc
Stroke
Exhaust port height 29.5 mm
Effective Displacement
Effective Compression Ratio
, and you want to find out IHV.