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Engine Displacement & Compression Ratio Calculators

Engine Displacement Calculator

This calculator requires a JavaScript compatible browser.

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

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

Want to do the math to PROPERLY figure and understand your Compression Ratio?

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