Why wouldn't PCV change the situation much? You are removing some of the pressure from under the piston. It seems it would be at least as effective as EGR because EGR is putting UNCOMBUSTABLE exhaust into the combustion chamber taking up space where COMBUSTABLE air and fuel could reside thus effectively diluting the intake charge. PCV is displacing combustable intake charge with COMBUSTABLE mixture.
On a more basic level, wouldn't the atmospheric pressure under descending piston A be inversely proportional to the atmospheric pressure under ascending piston B in the same engine?? The pressure trying to compress under piston A due to its downward travel would simply fill the void left by piston B's upward travel thus netting no pressure increase in the crankcase?
