The displacement of a single motor cylinder is calculated like the volume of a normal cylinder. However for the cylinder the height is s. This the distance between the upper and the lower dead center. It is meant a cylinder between the two piston positions. The displacement thus depends on the bore of the cylinder and the offset of the crankshaft.
The largest displacement of a petrol engine amounts to probably 27 litres (1923). Since diesel engines are used in large ships, the single displacement of only one cylinder can easily reach a cubic meter (1000 litres).