[Barnsnake]

In the everyday human-perceived world, darkness, cold, and suction are things that we can relate to, but in the science of physics they are not sources of action.
Yes, "suction" can be caused by externally acting on a system, but it is the higher pressure elsewhere that causes matter to move. In effect, the crankshaft turning, pulling on the rod, and lowering the piston, simply creates the opportunity for the atmospheric pressure to flow into the cylinder.