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 -<p>1. The intake stroke piston movement may be considered to be caused by gravity and/or atmospheric pressure<p>2. 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 together<p>Correct me if I am wrong.<p>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?<p>edit: typo