How does this system work? i have read what i can find on the net...i know it pushes oil into a selinoid and disconects the lifters and shuts off the fuel and spark on 4 of the cylinders, but everything i have read says that when the lifters disconect that the valves close and remain closed until it switches back to 8 cylinders. this does not make sense to me, if u close both the exhaust and intake valves where does the compressed air inside the cylinder go. i have ran this question past a few of my motor head friends and it doesnt make sense to any of us.