We have consolidated some of our most helpful calculators into a single downloadable MS Excel Spreadsheet. This spreadsheet is temporary until we have online calculators built into the website, which will require no special software. Also listed below are a few commonly used formulas gathered by our engineers.

Helpful Automatic Calculators (Requires MS Excel)

Piston Speed (ft/min.)
a = RPM
b = Stroke of Engine (ft)
Formula: 2 x a x b
Example: 2 x 8000 x .333 = 5328 ft/min

Compression Ratio (Total Swept Volume)
a = Combustion Chamber Volume at TDC
b = Cylinder Displacement (cc)
Formula: (a + b) / a
Example: (100.00 + 823.70) / 100.00 = 9.237

Rod Ratio
a = Rod Length
b = Stroke of Engine
Formula: a / b
Example: 6.0 / 3.5 = 1.714

Rod Length
a = Cylinder Block Length
b = Deck Clearance
c = Target Compression Height of Piston
d = Stroke of Engine
Formula: a - b - (c + (d / 2))
Example: 9.025 - .025 - (1.0 + (3.5 / 2)) = 6.25
Piston Dome Volume
a = Head Chamber Volume (cc)
b = Gasket Volume (cc)
c = Deck to Piston Volume (cc)
d = Cylinder Displacement
e = Target Compression Ratio
Formula: (a + b + c - (d / (e - 1.00))) x -1
Example: (60 + 10 + 10 - (823.7 / (9.237 - 1.00))) x -1 = 20cc

Piston Compression Height
a = Block Length
b = Stroke of Engine
c = Rod Length
d = Deck Clearance
Formula: a - (b / 2 + c) - d
Example: 9.025 - (3.50 / 2 + 6.00) - .025 = 1.250

Cylinder Displacement
a = Bore (Inches)
b = Stroke of Engine (Inches)
c = Number of Cylinders
cc Formula: a x a x .7854 x b x 16.387 x c
cc Example: 4 x 4 x .7854 x 4.0 x 16.387 x 6 = 4942.2142
CI Formula: a x a x .7854 x b x c
CI Example: 4 x 4 x .7854 x 4.0 x 6 = 301.5936
 
 
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