Piston Speed Calculator

Inputs

Stroke (S) Piston stroke length.

mm

Engine speed (n) Crankshaft speed.

rpm

Target mean speed (v_t) Target mean piston speed used to back-solve RPM.

m/s

Results

Default result

Mean piston speed (v_m)

18.63 m/s

Pass

Conservative first-pass mean-speed range.

Also computed

RPM at target speed (n_t) 6,977 rpm

Method notes 2 notes

Mean piston speed is an average. Peak piston speed is higher and depends on rod ratio and crank geometry.
Durability depends on piston mass, rod ratio, ring pack, oiling, materials, boost, temperature and duty cycle.

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