In order to make the engine compact and to minimize the number of engine parts, a simple crank mechanism is used in this engine. The crankshaft, which is supported by two ball bearings, is made from a steel shaft, two crank discs and a crank pin. The crank pin is connected to the displacer connecting rod. Two steel flywheels, which also act as the crank discs for the power-pistons, are attached
to both ends of the crankshaft.