I must be missing something, your throttle body doesn't have a PCV port. How is the clean side plumbed?

 

90% of the oil caught in the can is better than 100% in your intake..

 

You're right, the APS photo and instructions, from their install guide, are misleading (my shop manual also makes the same mistake). The breather hose that APS refers to is called the dirty air hose in my LS2 shop manual and it connects to the intake manifold, directly behind the throttle body, on the passenger side. I assume that the one-way valve is used to block air flow back into the valley cover when under boost. There is another port on the opposite side, just behind the throttle body, that feeds air into the intake when the EVAP Canister Purge Valve is actuated. Is that the clean air you are referring to?

BJK

 

The clean air side connects from the drivers right valve cover to the TB bellows.

 

In the APS setup, the valve cover breather hoses are routed under the car (behind the radiator) and connected just after the air filter which are in front of the wheel wells and the billows has been replaced by an aluminum pipe with meth injection. In effect, it seems I have both valve covers and the valley cover connected to the same vacuum potential, the intake manifold vacuum, when not under boost.
BJK

 

On turbo applications I prefer the clean side attachment point to be as close the turbo cold side inlet as possible. This generates the greatest amount of vacuum to evacuate the crankcase under boost conditions. This application really needs dual cans to function correctly.

Here's a diagram:

 

Aaron;

Thanks for your input and the diagram.

After going thru the exercise of defining the PCV plumbing of my turbo setup, I realized that I really didn't have a clean side dirty side setup for the valve covers and was thinking about using two catch cans, one for the obvious dirty air that was coming from the valley cover to the intake manifold via the one way check valve. The other one, I somehow had to plumb to catch the oil vapors from the valve covers as I could visualize, in my mind, what all that oil would do to the intake hoses and intercoolers. Your diagram really helps to finalize that for me. I am still a little confused as to the reason for the second one way check valve.

I'm also not sure how I would relocate the APS valve cover PCV connections from the front of the car all the way back to the turbos. It would be easy enough to drop the valve cover hoses at the back of the engine, but plumbing them into the turbo intake hoses is another thing.

BJK

 

The second one-way valve serves as a flow director for the clean side. This keeps the clean and dirty sides completely separate by not allowing any clean side reversion. The clean side becomes IN only and the dirty side is OUT only.

 

Just trying to be helpful ...... there is a Forced Induction section that would get you more opinions and advise


DH

 

Thanks

BJK

 

Thanks again Aaron.

More questions. The dirty side canister has/shows three connections. Is that a custom option to add the third port? I assume that the dirty line that goes to the turbo is to provide vacuum when the manifold connection is blocked during boost.
BJK

 

Yes, custom can. Exactly right on the second dirty side line.

 

I got to this post through a link from a previous post regarding the PCV delete.

And all i am getting is some one is just trying to sell some catch cans.....

You guys talk about deleting the PCV on the LS2, well i have done that since i purchased my 06 LS2 with ten miles on the OD, and yes the hoses are hanging down on both sides of the motor, after four years and 90 thousand miles the car has no irreversible wear and tear, the oil pump looked good, the pressure was fine, no rust of any kind in the lifters, rockers, no carbon build up in the valves, and specially no oil in the intake manifold...the engine was so clean that i decided to go one step further.

Last week i opened the engine up to install a set of LS3 heads and an LS3Intake, and the usual stuff that goes with the installation, new PAC springs all GM gaskets, ARP bolts, new Melling oil pump, new comp push rods, but kept all the parts i saw that wee in good shape, bolt her up and off i went to the dyno to get my WOT-AFR, and my drive ability back in shape....i have read countless hours of peoples opinions on them catch cans, i have friends that swear by them, but they all allow some oil to get into the Intake manifold....i know this for a fact, the friends that have these catch cans i have cleaned there throttle body with CRC throttle body cleaner and a good microfiber towel and i have gotten my hand as far as i can reach into the manifold and guess what! i have pulled the rag out all covered with oil....

 

Tagged and Bagged for me and some reading

Thanks,Matt