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Formulary Average piston speed

Maximum and mean piston speed

The average piston-speed is the distance that the piston travels, if during the complete stroke, it's speed remains constant. The piston speed does however vary (shown in light red), from zero at the top- and bottom dead centers, to its maximum speed just above the middle of the stroke, where it is around 1,6 times higher than the average piston speed (shown in dark red).

        s · n
vm =
          30.000

    vm · 30.000
s =
      n

      vm · 30.000
n =
     s

Checking the calculation!     Do you need help?
Please enter numbers only in two of the spaces, then click on the free space!
s Stroke mm
n Engine RPM RPM
vm Average piston speed
 m/s

Example

Given that:

s = 0,085 m; n = 5500 1/min

Assignment:

vm in m/s

Solution:

           s · n
vm = =
            30

0,085 m · 5500 1/min
= 15,58 m/s
               30

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