Quality German Auto Parts ~|~ Useful Formulas for Engine Building

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Useful Formulas for Engine Building

Engine Building Formula Collection

On this page we have compiled formulas meant to help the eager engine builder with the planning and building of an engine.

Please help us by sending formulas that you feel may be useful to others in the buidling of thier Stock, Performance or absolute Dream engine.

Engine Displacement in CC’s

Bore (mm) x Bore (mm) x Stroke (mm) x 0.0031416 = EDcc

Example: 87 x 87 x 69 x 0.0031416 = 1641cc

To get the 1 Cylinder Volume just divide that by 4

Example: 1641cc ÷ 4 = 410.25cc

Deck Volume in CC’s

In Millimeters: Bore (mm) x Bore (mm) x Deck Height (in.) x 0.01996 = DVcc

Example: 87 x 87 x 0.06 x 0.01996 = 9.06cc

In Inches: Bore (in.) x Bore (in.) x Deck Height (in.) x 12.87 = DVcc

Example: 3.425 x 3.425 x 0.06 x 12.87 = 9.06cc

Compression Ratio

(Headcc + Deckcc + 1Cylinder Volume) ÷ (Headcc + Deckcc) = CR

Example: (50cc + 9.06cc + 410.25cc) ÷ (50cc + 9.06cc) = 7.95 or 7.95:1

469.31 ÷ 59.06 = 7.95 or 7.95:1