Here you go, Piston area and force.

It’s simple math.

P*L*A*N

It’s that basic. And the math doesn’t lie.

When you confuse unit loading with area/psi and you are so bull headed that you refuse at least do the math to see how it works you are just being idiotic.
I admit before this thread I had an vague idea psi was based on volume, knew how that psi interreact with the surface area of the piston and Plan, Bmep etc.. only cared about overall volume and that fit with everything I seen, But wasn't until I just found ideal gas law I understand how.