To provide an engine using a piston mechanism that suppresses the generation of a carbon dioxide and a sulfur-nitrogen oxide, prevents global warming, and secures the preservation of the environment.

The engine includes a motion transmission unit 1, a cylinder 2, an electrode A3, an electric conductor 4, an electrode B5, a movable connection 6, a power supply 7 having an arbitrary current and voltage, a capacitor 8 having arbitrary electric capacitance, and a conducting wire 9. The engine operates the piston mechanism by electricity not by fossil fuel.