Use this tool to calculate the smallest Rotrex Pulley you can get in order to reach or approach the maximum RPM for the Rotrex supercharger. Select the Rotrex Supercharger model, enter your Crank Pulley Diameter and your Engine's RPM limit. Please note that you may need to rotate the Rotrex Supercharger far below its limit, so advise your mechanic before choosing a Rotrex Pulley.

Pulley Calculator

Use this tool to calculate the Maximum air flow and the Theoretical air flow, after you enter your Displacement, Standard Power, Target Power and Maximum Engine RPM. This tool intends to make it more convenient to choose a Rotrex model quickly, but a specialized mechanic should review the Rotrex model selection.

Rotrex Calculator