Hy Bob1200, your vacuum source(in your racing system) seems to be the exhaust , so the air separated from the oil gets ejected via exhaust manifold, but it never goes into the combustion chambers,does not go into the intake manifold, just pulled out and away. That system seems excelent. Keeps the oily stuff in the tank, and rids the engine of the bad air, without re-burning unproductive air in the cylinders.