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Lets try the explanation again. There is an air box as SooBlue said that distributes combustion air from the engine blower to all the cylinders. The inlet for the air is near the bottom of the cylinder. and the engine oil rings have to move past the intake port which wipes lube oil off the rings and combines it with the intake air thus explaining the oil consumption. In big engines they can not hold the tollerances fine enough so some of the compressed intake air as well as combustion blow by escapes arround the piston into the crankcase which makes the crankcase moderately pressurized. This air and oil vapors are then vented to the atmosphere in older engines or put into the engine exhaust . GM was not willing to cobel the design to meet the EPA guide lines for 2005. The other point mentioned by SooBlue is that in a two cycle you only have a short time at moderate speeds to charge the cylinder. To get more air into the cylinder you have to increase the boost which at some point proves to be impracticle. In a 4 cycle you have most of the intake stroke to do this so you can create a higher cylinder pressure.
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