I’ve been working on a setup that will be a properly operating PCV system without sucking oil into the intake manifold, especially with the low vacuum signal produced by a performance camshaft, with greater overlap and a lower LSA. It is intended to utilize a PCV valve that is calibrated for a lower vacuum signal, and close enough at idle to prevent excessive amounts of oil from being drawn into the intake.
I tried using only valve cover breathers, and the problem is that the blow-by fumes and oil ends up being pushed out into the engine compartment, especially under WOT of a performance engine. I am also trying to avoid using an oil separator that requires periodic draining.
This is what I have come up with to test on my truck. The prototype canister is something I machined out of scrap aluminum and welded together. It is a system of baffles where the oil is to coalesce and passively drain back into the engine before it gets drawn into the intake manifold.
It looks kind of funny with such small air cleaners but I’ll get around to a more substantial air cleaner in the future. For now, I just want to see how this works out. The system consists of the following: The prototype PCV baffled canister, a PCV valve for an older muscle car with a racy camshaft that operates at a lower vacuum signal, and a filtered breather on the driver’s side going to the air cleaner to handle the excess blow-by gases at WOT, when the PCV valve alone can’t keep up with the volume.