Home : Tech : Helpful Calculations

Immediately below is a list of the various charts/calculations on this page. Clicking on an item in the list below will take you to the respective section of this page.

## Engine DisplacementTop↑

 Engine displacement = bore X bore X stroke X 0.7854 X number of cylinders Example: Cylinder bore diameter = 4.000" Stroke length = 3.480" Number of cylinders = 8 Engine displacement = bore X bore X 0.7854 X number of cylinders Engine displacement = 4.000 X 4.000 X 3.480 X 0.7854 X 8 Engine displacement = 349.8586 cubic inches (round up to 350 cubic inches)

## Stroke Length Top↑

 Stroke Length = engine displacement / (bore X bore X 0.7854 X number of cylinders) Example: Engine Displacement = 350 cubic inches Cylinder bore diameter = 4.000" Number of cylinders = 8 Stroke Length = engine displacement / (bore X bore X 0.7854 X number of cylinders) Stroke Length = 349.8486 / (4.000 X 4.000 X 0.7854 X 8) Stroke Length = 3.480"

## Cylinder Bore DiameterTop↑

 Cylinder bore diameter = square root of [engine displacement/(stroke X 0.7854 X number of cylinders)] Example 1: Engine Displacement = 350 cubic inches Stroke Length = 3.480" Number of cylinders = 8 Cylinder bore diameter = square root of [engine displacement/(stroke X 0.7854 X number of cylinders)] Cylinder bore diameter = √[349.8486 / (3.480 X 0.7854 X 8)] Cylinder bore diameter = 4.000" Example 1: NASCAR® has a 358 cubic inch maximum engine size rule. If we use a 3.480" crank, what is biggest bore allowed? Example 1: Engine Displacement = 358 cubic inches Stroke Length = 3.480" Number of cylinders = 8 Cylinder bore diameter = square root of [engine displacement/(stroke X 0.7854 X number of cylinders)] Cylinder bore diameter = √[358 / (3.480 X 0.7854 X 8)] Cylinder bore diameter = 4.046"

## Formula For Milling PistonsTop↑

(For 4032 material only)
 Piston dome cc's to gram conversion: 1cc (volume) = 2.8 grams (weight) This is a good way to remove excess dome without having to re-cc piston: Mill a small amount and re-weight piston until total reduction is reached. Example: A piston has 12.5cc effective dome volume. The desired effective dome volume is 10.5cc. To remove 2.0cc, cut 5.6 grams (2 X 2.8) from the piston dome.