Here you go, Piston area and force.

Well, @Bewey, you are not only wrong, you are extremely rude. I can think of 100 more polite ways to disagree with somebody. I don’t like it when people are rude on this form like that. There is absolutely no excuse for being rude to other people on this forum. As for you being wrong, are you saying that an explosion of compressed air and gasoline on a 4 inch piston is going to be the exact same pressure down on the connecting rod as on a 4.25 inch piston? Because if that is what you are saying, you are wrong. A given amount of pressure on a piston of different size is the theory behind how floor jacks work.