[djctoto]

While investigating the addition of a robust catch can to my car I examined closely how the current set up had been implemented by Patriot Motorsports USA and still remains on the car.

What I found was a diverter valve with a nipple in place of the factory part which of course feeds from the crankcase directly into the Supercharger.

There is a hose from this nipple that feeds around the engine and connects to a simple two port catch can. This can has no baffles, no built in PVC valve and no check valve. I opened it up, and blew air through both ports to check it out.

I found the same exact part on Amazon
It's $35 and has nothing more than some steel wool type material to filter oil vapors.

My understanding of the factory system is:

The factory air/oil separator box operates by having fresh air supplied as an input from intake tube post air filter which then feeds the two lines going to the valve covers. Under vacuum the PCV valve at valley plate pulls vacuum on crankcase while fresh air is entering the valve covers, a closed system.

Under boost pressure builds up in engine which can bleed off through the valve cover vents lines and goes back to the box. Any oil vapor will drain to the oil pan. This setup is sufficient until you get to higher horsepower/boost levels in which the hose diameters need to be increased to keep up with the demand.

With the factory PCV the supercharger pulls vacuum on the engine via a direct connection between valley plate and the supercharger and receives all the oil vapors created in this instance to be burnt off in combustion.

The installed PCV now closes off this vacuum port to the supercharger and provides a direct line from the valley plate feeding into the catch can that is vented to atmosphere with no vacuum being applied to it.

Therefore as installed my engine can only vent pressure instead of it having vacuum applied to keep it from building pressure.

I believe this has been done incorrectly and needs to be corrected.

Can anyone other than Patriot Motorsports USA comment on:

Is my understanding of all this correct?
What kind of problems this current set up may cause?
how to fix it?

I have pictures showing all of this but I'm having difficulty attaching them.
I'll work on getting pictures posted up but in the meantime the description is 100% accurate and should suffice.

Thanks in advance.