Some of you know who I am, some of you don't. Hopefully those who do can shed light on my credibility. I have had my R56 S PCV system modified for many years. Passenger PVC blocked with driver side vented to atmosphere. I know many of you have a similar setup but with the driver side attached to a catch can then vented to atmosphere. My advice is to immediately reconnect it to a vacuum source.

This was concluded after having issues with oil consumption. Exaggerated due to my built engine. The issue is the pressure gradient created in-between the valve cover/crank and the intake manifold. When the passenger PCV is blocked, during casual driving on intake stroke the piston and intake track has roughly -12 PSI while the valve cover and crank are roughly at atmosphere. This was causing oil to be forced through valve seals (which are pretty new) and past the pistons rings. This was found out by looking at my valves, they still had carbon build up even with the PCV system being fully disconnected. By having the passenger side or driver side hooked up the pressure gradient is eliminated.

 

Theres a completely separate vacuum system you can buy so it is still a dry intake system. The vacuum on the motor is also to allow the rings to seal. They are assemble with low tension rings. Low tension rings require vacuum to help the stay sesled snd stanilized.

 

Got a link to this system?

 

http://grannys.tripod.com/evac.html

 

Its how it was done. But the article tells you what to buy.
Even tho some hook
Up one side of the oil catch can to the turbo, it'd be better to pull 14" of vacuum all the time by not using the turbo. Seems to me thats the only true way of eliminating the issue completely. Im gonna try it. Cant hurt.