Mean piston speed is a critical parameter for assessing engine performance and durability. It represents the average speed of the piston as it moves within the cylinder. High mean piston speeds can indicate increased stress on engine components, which may affect longevity and reliability.

When the stroke is given in inches and the result is required in feet per minute (ft/min), you calculate mean piston speed by taking the value of the length of the piston stroke multiplied by the engine speed in rpm and divide it by six.

When the stroke is given in millimeters (mm) and the result is required in millimeters per second (mm/sec), you calculate mean piston speed by taking the value of 2 multiplied by the length of the piston stroke multiplied by the engine speed in rpm and divide it by 60.

By entering the stroke length and engine speed into the calculator, it will perform these calculations for you, providing the mean piston speed in meters per second (m/s) and feet per minute (ft/min).