LS2 is pulling oil in the intake. I have a 403 and it did it stock, as most do, but now its a lil more than I'm willing to accept. My question is on the LS2, where or how can I run a catch system? On the blower car I ran it in between the breather deal on the valve cover and the intake. On this motor, there is that line that comes out of the passenger side cover and then that one that goes into the area near the TB.

I guess the best thing to do is run any breather lines that go into the intake through a catch. Any thoughts? Is there one line that is the culprit or are they all suspect?

 

The LS6 valley cover has to be the best place to vent the motor if you have one of those. Valve covers would be my second choice because they have so much turbulance inside there that they cause extra oil mist-smoke.

 

The motor has all the factory vents in place. I guess I'm asking which ones should I route through a catch, or if I should route all of them through a catch. So far I'm seeing the one from the lifter valley that goes to the TB and one from the pass cover. The valve cover one goes to an electric soleniod... it's closed with no power to it, then to the intake.

 

The line going to the valve cover should be the Fresh air supply into the engine....which provides the flow to help push the Oily stale air out of the valley cover.

 

I am with ya brother!
I am not blowing oil as in rings, valve seals or rocker bolts into the heads but am sucking oil thru what is the LS2 PCV system like crazy. I have a catch can between the LS2 valley cover and the intake however I can fill that in a 20 min track session.
Just today I recieved a second LS2 valley because there is a definite restriction in the valley cover . If you blow into the nipple on the valley it feels resticted down to about 1/3 tube diameter. Well the new one is just the same, so that is the "PCV" restrictor I guess.
I tried using a breather on the oil fill but that is very messy under braking.
I think I am as close to LS2 factory setup + catch can as possible.
No other problems with motor but the oil suck is worse than previous modded LS1.
https://ls1tech.com/forums/generation-iv-internal-engine/570410-ls2-stroker-smoker-does-your-s-smoke.html

Anyone got any different ideas??

 

I ran a breather on a blower car and experienced the same mess as you, so that's not really an option. Under heavy throttle mine sucks too. I can't imagine this is good for combustion. I'm going to try the catch and keep pestering you guys for info. C'mon Katech, you guys thrash these motors... what do you do?

I heard one of the tuners run there breather line from the bellows down to the air filter box. The distance is supposed to help.

 

Great Pic!!! Those explanations should help.

 

After 600 miles on a new LS2/402 with catch can:

 

I am have the same problem with my new 408 ls2 motor. Glad to see the picture of the catch can I think i will do something like that. Hope Katech jumps in and put there 2 cents in also.

 

You have the lines on the catch can lines reversed. The oil needs to be drawn in on the side and the air sucked out the top otherwise oil dropping in from the top could be sucked right out the side as it drops into the can!

 

Suggest you check the AMW website mate.
"The internal design of the AMW catch can is superior in function to other catch cans on the market. Oil vapors and other contaminates are first caught and condensed by a stainless mesh and then dropped to the bottom of the can where a series of under-cuts in the walls prevent the oil from climbing back to the top and exiting back into the intake tract."
http://www.accmachtech.com/PCVCatchC...structions.pdf

 

Good catch! My directions are gone, glad you made the catch!

 

WTF...I thought the same thing...the lines looked reversed. Guess I've been running mine backwards for about two years now...grrrrrrrrrrrrrrrrrr.

 

I'll betcha it don't make no big diff.

 

It can't possibly...been running it like that for two years, and it has kept my intake nice and clean. It shall be reversed shortly though...