About Piston Displacement Calculations
[Pages:2]Calculating
Engine/Piston
Displacement
March
5,
2012
About Piston Displacement Calculations One of the most important things to remember when calculating piston displacement is that you are measuring ____________________.
To calculate your engines displacement use this formula: Piston Displacement = x (Radius)2 x Stroke x Number of cylinders =
Radius =
Stroke =
Number of cylinders =
Sample Problem Here is an Example: This engine has: Bore = 80 mm
Stroke = 90 mm Number of Cylinders = 1 Radius = Bore/2
= 80 ? 2 = 40 mm
Calculating
Engine/Piston
Displacement
March
5,
2012
Piston Displacement = x (radius)2 x stroke x number of cylinders
= 3.14 x (40)2 x 90 x 1
= 3.14 x 1600 mm x 90 x 1
= 452,160 mm3
You will notice that you answer is in mm3 . Engines are usually given a size of displacement in cm3 or commonly referred to as CC's. To convert your answer to CC's, divide your answer by 1000. In this example, you would have 452,160mm3 ? 1000 giving you an answer of 452.16 cm3 or 452.16 cc. This engine has a displacement of 452.16 cm3 or 452.16 cc.
Practice Problem ? Calculate the Engine Displacement Given the Information
The engine has: Bore = 87.5 mm
Stroke = 91.4 mm
Number of Cylinders = 2
Radius = Bore/2
=
=
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