TurboBerserker

iTrader: (1)

Math:

Formula 1:

CR =

[{(B/2)^2 * S*Pi}+Vcc+Vp+{(B/2)^2*Pi*(DH+TG)}]
[{(B/2)^2*Pi*(DH+TG)}+Vcc+Vp]

Where:

CR= Compression Ratio
B = Cylinder bore
S = Stroke
Vcc= Combustion Chamber Volume
Vp= Piston Volume
DH = Deck Height
TG = Head Gasket Crush Thickness
Pi = 3.1415


Formula 2: (I prefer this one)

Compression Ratio = (GV+DV+HV-VV+PV) / (GV+DV+HV-VV)


GV (Head Gasket Volume) = Bore(in) X Bore(in) X 12.87 X (Head Gasket Thickness in Inches)

DV (Below Deck Volume) = Bore(in) X Bore(in) X 12.87 X (Inches Below the Deck)

HV (Head Volume) = CC's

VV (Dish, Valve Pocket, Dome Volume) = CC's
(Minus for dish or valve pockets, Plus for dome)

PV (Volume displaced by Piston) = Bore X Bore X Stroke X 12.87


Some links:

Smokeup's CR Calculator

Smokeup's Dynamic CR calculator

1SlowHoe

iTrader: (28)

This is the one I've been using:
http://www.race-cars.net/calculators...alculator.html