Car experts call it engine displacement, and you can calculate it as follows:
Get the volume of one of the cylinders of your engine. You can try the Omni Calculator tool tank volume calculator or get the cylinder radius and height (engine piston stroke).
Square the radius, multiply by pi (3.14159...), and then by piston stroke.
Multiply the one-cylinder volume by the number of cylinders in your engine, and you will get engine capacity.
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