## Helpful Engine Calculators

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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= RPMb= Stroke of Engine (ft)Formula: 2 x a x bExample: 2 x 8000 x .333 = 5328 ft/min
Compression Ratio (Total Swept Volume)a= Combustion Chamber Volume at TDCb= Cylinder Displacement (cc)Formula: (a + b) / aExample: (100.00 + 823.70) / 100.00 = 9.237
Rod Ratioa= Rod Lengthb= Stroke of EngineFormula: a / bExample: 6.0 / 3.5 = 1.714
Rod Lengtha= Cylinder Block Lengthb= Deck Clearancec= Target Compression Height of Pistond= Stroke of EngineFormula: a - b - (c + (d / 2))Example: 9.025 - .025 - (1.0 + (3.5 / 2)) = 6.25Piston Dome Volumea= Head Chamber Volume (cc)b= Gasket Volume (cc)c= Deck to Piston Volume (cc)d= Cylinder Displacemente= Target Compression RatioFormula: (a + b + c - (d / (e - 1.00))) x -1Example: (60 + 10 + 10 - (823.7 / (9.237 - 1.00))) x -1 = 20cc
Piston Compression Heighta= Block Lengthb= Stroke of Enginec= Rod Lengthd= Deck ClearanceFormula: a - (b / 2 + c) - dExample: 9.025 - (3.50 / 2 + 6.00) - .025 = 1.250
Cylinder Displacementa= Bore (Inches)b= Stroke of Engine (Inches)c= Number of Cylinderscc Formula: a x a x .7854 x b x 16.387 x ccc Example: 4 x 4 x .7854 x 4.0 x 16.387 x 6 = 4942.2142CI Formula: a x a x .7854 x b x cCI Example: 4 x 4 x .7854 x 4.0 x 6 = 301.5936