Crank/Rod/Piston Calculator

This calculator computes the motion data of a piston in a cylinder from TDC to BDC. Various parameters may be selected from the provided Pontiac engines pulldown or you may enter your own.

The calculated results are:

**Crank angle**is the crankshaft rotation from TDC to BDC in 10-degree increments.**Rod Angle**is the angle in degrees between the bore centerline and the line between the small & big rod end centers.**Piston travel**is inches down from TDC.**Piston speed**is in Feet Per Minute (FPM) for the RPM in**Engine**(parameters).**Piston accel**is in Feet Per Minute squared (FPM^2).**Effect C.R.**is the effective compression ratio at the crank position listed.**Effect lever**is the effective lever arm in inches whose maxiumum value is half of stroke which occurs at the optimum crank angle.

**Opt angle:**is when the connecting rod and crankshaft arm are at right angles.**Max speed:**is the maximum piston speed at the closest 1-degree increment.**at angle:**is the crankshaft rotation where**Max speed**occurs.**Mean speed:**is the average piston speed, i.e., stroke length times RPM in**Engine**(parameters).