Engine Displacement Calculator

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Fill in either Inch or Metric values, then click   

Standard Values Enter the Bore Diameter (inch) Enter the Stroke Length (inch) Enter the Number of cylinders

Metric Values Enter the Bore Diameter (mm) Enter the Stroke Length (mm) Enter the Number of cylinders

The numbers you entered give a displacement of cubic inches or liters.

Compression Ratio Calculator

Bore in Stroke in Head cc's Gasket Thickness in Deck Height (Put .0001 for zero deck) in Dish or Valve Pocket [-] or Dome [+] cc's Number of Cylinders Displacement Cubic Inches Compression Ratio

Horsepower Calculator

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Compression Ratio Formulas

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


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

Cubic Inches = Bore x Bore X Stroke X Number of Cylinders X .7854

Convert Cubic Inches to CCs = Cubic Inches X 16.386
Convert Cubic Inches to Liters = Cubic Inches X .016386 

Engine in Liters = (Bore(mm) X Bore(mm) X Stroke(mm)
X Number of Cylinders X 12.87) / (16386 X 1000)

Engine in CCs = (Bore(mm) X Bore(mm) X Stroke(mm)
X Number of Cylinders X 12.87) / 16386

Convert CCs to Cubic Inches = CCs / 16.386
Convert Liters to Cubic Inches = Liters / .016386

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