How a Car Engine Works
I have a question: exactly what causes the piston to come back after the intake/power stroke?
Let me write what I guess I have understood -1. The intake stroke piston movement may be considered to be caused by gravity and/or atmospheric pressure2. The power stroke piston movement may be considered to be caused by gravity and/or atmospheric pressure and/or the expansion due to explosion all taken togetherCorrect me if I am wrong.But what baffles me is this: what causes the  piston movement during the compression stroke and exhaust stroke?
Any expert here to enlighten me on this?edit: typo