Piston Speed Calculator

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The distance the piston travels from Top Dead Center (TDC) to Bottom Dead Center (BDC). This is half the full piston travel per revolution.
in
Revolutions per minute of the crankshaft. The piston completes two strokes (one up, one down) per full revolution.
RPM
Mean piston speedNormal street
3,480ft/min

Average speed of the piston across a full revolution (always in ft/min)

Mean piston speed17.68m/s
Peak piston speed5,466.4ft/min
Peak piston speed27.77m/s
Peak-to-mean ratio1.5708
3,480 ft/min
Light duty<2500Street2500-3500Performance3500-4500Racing4500-5500Extreme5500+

MPS is 3480 ft/min - Normal street range.

  • Mean piston speed is 3480 ft/min (17.68 m/s), placing it in the Normal street range.
  • Peak instantaneous speed at mid-stroke is 5466 ft/min, which is pi/2 (about 1.571) times the mean speed.
  • Below 3,500 ft/min (17.8 m/s) is the comfortable long-life zone for most street engines with standard parts.
  • Mean piston speed is a key durability indicator - rings, rod bolts, bearings, and crankshafts are all sized to tolerate the stress at peak speed.

Next stepTo extend engine life at high MPS, choose shorter strokes at the same displacement (bore-dominated design), use premium rod bolts rated for the G-load, and ensure oil viscosity is matched to operating temperature.

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