Here you go, Piston area and force.

That only works if the induction system is able to simultaneously pass more air. And a big part of the increase is the larger Swept volume which increases the SCR.
What I mean is this, you can put a 5" piston on your pushmower, but good luck even starting it with that lil rope starter.. lol
Maybe I should four barrel swap the lawnmower lol.