# Bore

displacement = number of cylinders x 3.14 x (bore / 2)^{2} x stroke

maximum rpm due to mass = 0.0056 x displacement^{2} - 8.89 x ci + 11527

Pictured is the top of an engine block. The cylinders are bored into the block. The bore measurement you use for HiPerMath and real life is the diameter of each cylinder.

## What you do:

Choose a bore that give you the power you want and the rpms (revolutions per minute) you want.

Factors to consider:

The HiPerMath equations are:

displacement = number of cylinders x 3.14 x (bore / 2)^{2} x stroke

maximum rpm due to mass = 0.0056 x displacement^{2} - 8.89 x ci + 11527

Definitions:

displacement = how many cubic inches (in

^{3}) your engine is.

stroke = the distance the piston travels from top to bottom in the cylinder.

bore = the diameter of the cylinder.

rpm = revolutions per minute