User guide

HOT ROD CALC™ — 9

Piston Speed – Enter or calculate an engine’s Piston
Speed. Calculate Piston Speed given values for RPM
and Stroke length.

Mechanical Efficiency – Enters the engine’s
mechanical efficiency, a numeric value representing a
percentage of the power available inside the engine’s
cylinders that makes its way to the flywheel (e.g. less
friction losses from rings, pistons, bearing friction, oil
pumps, etc.). Default value is 85%.

Enter or calculate a Carburetor size as a flow rate.
Calculate Carburetor size given values for Engine
Displacement, RPM and Volumetric Efficiency.

Volumetric Efficiency – Enter or calculate the volumetric
efficiency of an engine. Calculate given values for Engine
Displacement, RPM and Carburetor Size.

Bore – Enter or calculate Bore diameter. Use to
calculate engine displacement, stroke or compression
ratio. Calculate Bore given values for engine
displacement and Stroke length.

Gasket Bore – Enter and store Gasket Bore size. Used
in calculating Compression Ratio.

Stroke – Enter or calculate Stroke length. Use to
calculate engine displacement, bore or compression
ratio and piston speed. Calculate Stroke length given
values for engine displacement and Bore diameter.

Gasket Thickness – Enter and store Gasket Thickness.
Used in calculating Compression Ratio.

RPM – Enter or calculate RPM. Calculate given values
for Stroke and Piston Speed.