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Engine Formulas and Calculation Examples
Example Bore:
92mm
Example Stroke:
69mm
Example Deck Height (thousandths of an inch):
.080"
Example Desired Compression Ratio:
9.6 to 1

Formula
Example
Deck Height (mm) = 
Deck Height (inches) x 25.4 mm/inch
.080 inches x 25.4 mm/inch  = 2.03 mm

Total Engine Displacement (cc) = 
Bore x Bore x 
Stroke (mm) x .0031416
92 mm x 92 mm x 69 mm x .0031416
= 1834.74 cc

Deck Height 
Displacement = 
(cc) 
Bore x Bore x Deck Height (mm) x .0031416

4
92 mm x 92 mm x 2.03 mm x .0031416
= 13.49 cc

4

Cylinder 
Displacement = 
(cc) 
Bore x Bore x Stroke in mm x .0031416

4
92 x 92 mm x 69 mm x .0031416
= 458.7 cc

4

Head 
Displacement = 
(cc) 
Cylinder Displacement + 
Deck Height Displacement - 
("Desired Compression Ratio" 
x Deck Height Displacement)

("Desired Compression Ratio" -1)
458.7 cc + 13.49 cc - (9.6 x 13.49 cc)
= 39.85 cc

(9.6 -1)

Compression
Ratio = 
Cylinder Displacement + Deck Height Displacement + Head CC's

Deck Height Displacement + Head CC's
458.7 cc + 13.49 cc + 39.85 cc
= 9.6 to 1

13.49 cc + 39.85 cc

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