To calculate Force must know some parameter like average effective pressure and other data. Pressure indicator Pi can be calculated, the data should know such as:
D = cylinder diameter
Pmi = average effective pressure, N/m2
S = piston cylcle, m
N = motor speed in rpm
i = number of cylinder
Formula to calculate indicator pressure of gasoline engine 4 cycles is:
Pi = 0.785 . D2 . Pmi . S . 0.5 . N . I (Watt), if divide by 1000 the unit equal with kW (kilowatt).
Average pressure effective indicator Pmi work in every part of piston surface and result piston force, where Pmi = piston area, piston surface area is 0.875 . D2 and the piston force is 0.875 . D2 . Pmi. Surface of piston expressed in m2 and average effective pressure indicator express in N/m2, so Force will represent by N unit.
The force that work on all cycle are as follows:
Work = Force x Distance
Work on cylinder = Force
Other piston cycle = 0.785 x D2 x Pmi x S
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