Calculate Bore Size and Bore/Stroke Ratio

Calculate Bore from Engine Size, Stroke, and Number of cylinders

Input Unit Type
1 = Inches 2 = mm
Engine Size Cubic Inches
CC's
Stroke Size
Number of Cylinders
Rod Length
Rod/Stroke Ratio (R/S) :1
Bore Size
Bore/Stroke Ratio (B/S) :1

Calculate Engine Size in Cubic Inches and CC's

Calculate CI (Engine Size) from Bore, Stroke, and Number of cylinders

Input Unit Type
1 = Inches 2 = mm
Bore Size
Stroke Size
Number of Cylinders
Rod Length
Bore/Stroke Ratio (B/S) :1
Rod/Stroke Ratio (R/S) :1
Engine Size Cubic Inches
CC's

Calculate Engine's Compression Ratio (CR)

Get accurate compression without the guesswork!
Get your engine's optimal compression ratio and total displacement in no time flat! Just complete your engine setup, click calculate, and you’re on your way to maximum performance.

Bore: (diameter)
Stroke:
Cylinder Head Volume:
Effective Dome Volume:
Use (-) for Dome and (+) for Dish.
Deck Clearance:
Compressed Gasket Thickness:
Number of Cylinders:
Compression Ratio :
BTotal Displacement (in.3) :
Total Displacement cc's :

Calculate Rod Stroke Ratio

Calculate Rod Stroke Ratio from Stroke and Rod Length

Input Unit Type
1 = Inches 2 = mm
Bore Size
Stroke Size
Number of Cylinders
Rod Length
Bore/Stroke Ratio (B/S) :1
Engine Size -- Cubic Inches
CC's
Rod/Stroke Ratio (R/S) :1

Calculate Stroke Size

Calculate Stroke from Engine Size, bore, and Number of cylinders

Input Unit Type
1 = Inches 2 = mm
Engine Size Cubic Inches
CC's
bore Size
Number of Cylinders
Rod Length
bore4/Stroke Ratio (B/S) :1
Rod/Stroke Ratio (R/S) :1
Stroke Size