1. Opened engine:

2. Closed engine:

NOTE: The Opened Engine using air intake/exhaust and the Closed Engine using oil from the back. Magnet in the engine is Electromagnetic and normal magnet in the Piston. The wheel on the piston is to control electric output and of course control the electromagnetic power and piston speed.
3. Special invention (free electricity generator):
4. Original piston image (Searching from Google):
