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Formulary Piston Force


Pressure produces piston force


An average working pressure, determined through all the strokes is built up. This pushes the piston with a certain amount of force in the direction of the crankshaft. The strength of this force also depends on of the piston surface-area. The highest average pressures of about 16 bar are found in F3 engines.

The piston surface is calculated from the flat, circular area,
notfrom a possibly very uneven area.


F = A · pm

     F
A =
       pm

       F
pm =
         A

Check your calculation!     You need help?
Please enter only numbers in one field!
d Diameter mm cm dm m
A Piston surface-area mm² cm² dm² m²
Check your calculation!     You need help?
Please enter numbers only in two of the three fields!
A Piston surface-area mm² cm² dm² m²
p Average working pressure   bar
F Piston force N daN kN
Places behind the comma: 2 3 4 5
Other units:
1 bar = 10 N/cm²
1 Pascal = 1 N/m²
1 bar = 100.000 Pascal

Example

Var. set:

pm = 8,8 bar; A = 728 mm² = 7,28 cm²

Var. asked for:

F in N

Answer:

F = 10 · A · pm = 10 · 7,28 cm² · 8,8 bar = 640,64 N


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