Being boosted what are you guys doing? Vacuum or vented catch cans for the PCV setup. I have tried reading and searching and it seems to be one of the contemplated subjects.

Any problems running it just vented?

 

You can do either. I'm going to use a regular non-vented can because I already have it, a check valve between the intake and the can, and a breather on the valve cover.
Pretty simple.

 

For forced induction you will want a catch can that is vented.
Run both valve covers to a catch can with a filter on top of the can.
OR
Run both valve covers to a catch can and have the can vent routed to the cai tube or turbo filter. That way the engine can still vent while under pressure and the fumes are recycled back into the engine.

The first option may cause fumes to enter the cab while under boost.

If an engine isn't vented , while under pressure, the dipstick may pop out, gaskets may leak (typically the rear main seal), or with a turbo, oil drainage may be an issue.

 

I'm using a vented catch can. Both valve covers to the can. Intake vacuum port to the can.

Line from the turbo air filter to the passenger valve cover.

I'm in the process of installing it now, I need to get an LS1 type passenger valve cover as it has 2 ports versus mine with 1.

Factory style "closed" PCV that will still positively vent the crankcase under boost.

 

For higher boost levels you will want to drill and weld in some 1/2" or -8 bungs along with the same sized hose

 

Unless you vent a valve cover

 

I ran a vented can for a while but it stayed 100% dry so I just took it off and vent both covers directly with seperate small filters. Maybe I have very low blow-by, but ive never had an issue or smelled oil.

 

My catch can stays pretty dry as well. I even plumbed it up next to the headlight to keep it cool, supposed to help condense the oil out of the air. In a thousand miles it only catches a couple CC's of oil, and its usually a very thick sludgy oil that smells like fuel. I've seen some peoples catch cans catching a lot of new looking oil.

 

Now that I think of it, anyone ever had any issue with oil being sucked into the turbo compressor?

 

That issue could be too much oil and not enough drain; and possible just a bad sealing turbo.
OR
The intake tube/filter is too small and under wot and full boost , there is a vacuum being created causing oil to be pulled out and swirl around the compressor inlet bore.
If just a little smear is there, it's no big deal, not normal but does happen.

Our setup, with the filters on and full boost, a swirl of oil will appear on the compressor inlet; but that's at 24psi and tiny filters.
With them off, no oil appears.