Quote:

They will have less wall tension and less contact. With crank case pressure instead of vacuum it will make the rings job harder. Pressure makes it harder for rings to stay seated against bottom of ring groove. Yes we've used them with good success, but with a pump. JMO


Are you saying this about any 1.5 mm, 1.5 mm, 3.0 mm ring pack? I'm asking because Mahle sells a bunch of PowerPack replacement pistons with this same pack and these are intended to be pistons for street cars that I wouldn't expect to be using a vacuum pump.