Catch Can Install

[VX-300]

he mentioned that GM have put an oil - air separator under the valley cover that acts just like a catch can in the 6.0L motors after they accepted that the LS1 had real issues with oil in the breather system.

L98 and LS2 use this valley cover.





The black rectangular box underneath is the oil mist control baffling. You still get oil coming through it, as anyone who has a catch can on an LS2 will attest.


L76 does not use the above valley cover because they have a Lifter Oil Manifold Assembly in the valley instead. The oil mist control for L76 seems to be just a simple brass restrictor about 1/8" ID located inside the vertical outlet fitting from the rear passenger side valve cover.

L76 L.O.M.A.




Your catch can mounting : There is another threaded bolt hole on the front face of the drivers side head, lower down. You could move the earth to there.
Relocating the EVAP solenoid will be more of a challenge.

[PBoB]

That answers some questions that arised when we did Paul's (bowlerr) blower install, thanks!

I was going to relocate the earth wire there, but my catch can has two bolt holes on the bracket which line up perfectly with the two holes on the head.

Cheers
Phil

[VX-300]

I was going to relocate the earth wire there, but my catch can has two bolt holes on the bracket which line up perfectly with the two holes on the head.

There's no reason why the earth washer can't share a bolt hole with another item.

[PBoB]

Righto, catch can installed, and it wasn't that hard. The hardest part was trying to reach the bolt I dropped in the engine bay .

There were a few hoses I had to move, but nothing that couldn't be put back.

Cheers
Phil

[MJR-57T]

I ran into a little pickle with my setup.

I ran it like the 1st pic, but i found that it nearly burned my ute to the ground this morning.
Oil vented out the dip stick tube all over the exhast manifold.
Later i found that the setup below is for a vented can


Ive now set it up like sixleeta's pics above and it seems to be ideling a little high.
Have i set it up alright for a sealed can or is there another way.
I dont want to go through another smoke show again. Especialy when your on the way to the dealer for a warenty repair!!


Also the passenger side rocker covers vent is blocked off, is this normal for a VY as ive seen heaps of pics where a line comes from the back of the engine down the drivers side to the TB.
Is something missing off mine??

[Panelman]

LS1 GenIII VZ ETB and OTR.

Hi fellas. I have read and read, and checked again. I cannot see any guide for the VZ GenIII with Electronic TB, plus I have an OTR.




There is only 2 hoses that I can see. One is from the rocker to the OTR, and 2nd is the looped one behind the ETB.



Where is the 3rd one? There is an L shaped plug under the TB which has nothing attatched. I remember Holden doing a recall fix on a hose position... could this have been the 3rd hose?

Anyway, would like to get this Catchcan (SEALED) hooked up soon. Any help would be muchly appreciated.

Panelman.

Swingtan has just given me a run through.

Apparently is a simple job. Behind the ETB is the bent around hose, which is all I need. Remove the hose. The bottom one is the inlet to the catch can, and the top on is the return. Simple!

Thanks Simon.

Apparently this setup is very similar to the LS2.

I'll post up pics once I completed the install.

[VX-300]

Panelman.

Leave the hose going from OTR to rocker cover as is.

Remove the U shaped hose in this pic.

Run a hose from the nipple on the front of the valley cover to the IN port of the sealed catch can.

Run another hose from the OUT port of the sealed catchcan to the nipple on the side of the intake manifold.




MJR 350

Yours looks right for a sealed catch can.
Just check that the hose coming from the valley is going to the port marked IN on the can.
And the hose going to the side of the intake manifold is coming from the OUT port on the catchcan.

I can't see the stampings on the can in the pic is all.

[MJR-57T]

Thanks VX-300

Yea its a uni can so there's no IN or OUT.

Ill be buying a proper one soon thats suited for the LS series with the brackets ect ect.

This one seems to work fine.
I took it off to check a few things and there was about 10ml's of oil in the bottom after 2 weeks and a long 800km drive inbetween.
The oil is now all over the driveway because i of the way i rested it on the ground not expecting anything to come out

[ti0350]

Sorry for the noob question but I'm a total nuffy when it comes to anything on my car..
I'm thinking of putting a catch can on my SS, but looking around on ebay I see some with 2 connections for hose and some with 3 connections, which one should I get..
I think I have an idea of how to set it up the line from the rocker cover goes into the in on the can, the the hose from the manifold goes into the out of the can and you block up the line from the throttle body..

[Banks_vz]

Hi guys, had a look at my setup and i have no idea

I think its because im running the standard intake setup. Where would the 'fresh air' pipe go, or should it be left as is? Can i put a catch can in, B4 i got an OTR or dont bother just yet?

[A^K^T]

Hi guys, had a look at my setup and i have no idea

I think its because im running the standard intake setup. Where would the 'fresh air' pipe go, or should it be left as is? Can i put a catch can in, B4 i got an OTR or dont bother just yet?

You would still set up a catch can same as the pic below , just replace the short hose that goes from the valley cover to the intake manifold with the hoses that go to and from the catch can , leave the one that goes from the maf pipe to the rocker cover there and if you go otr plumb a hose that gets fresh filtered air from somewhere in between the throttle body and air filter .

[VX-300]

Sorry for the noob question but I'm a total nuffy when it comes to anything on my car..
I'm thinking of putting a catch can on my SS, but looking around on ebay I see some with 2 connections for hose and some with 3 connections, which one should I get..
I think I have an idea of how to set it up the line from the rocker cover goes into the in on the can, the the hose from the manifold goes into the out of the can and you block up the line from the throttle body..

I think you have no idea.

Fresh air comes from the outlet on the throttle body or from the intake pipe in front of the throttle body. This fresh air goes into the front drivers side rocker cover. IE. leave that hose as per stock.

Foul air comes out of the valley cover at the front drivers side.......run this to the IN of the sealed catch can.
From the OUT of the catch can run a hose to the side of the intake manifold.

Hi guys, had a look at my setup and i have no idea
I think its because im running the standard intake setup. Where would the 'fresh air' pipe go, or should it be left as is? Can i put a catch can in, B4 i got an OTR or dont bother just yet?

Leave the fresh air supply line as is.
Yes you can put a catch can in now.
If you go OTR all that changes is the current fresh air pick-up point (X) at the elbow moves to someplace else in front of the throttle blade.

[Banks_vz]

Champion, with size hose is commonly used with the catch cans? I want to run braided line to and from the can so what -6 line (3/8")?

Replacing all the hoses with braided line as i do them if your wondering why lol

[VX-300]

Champion, with size hose is commonly used with the catch cans? I want to run braided line to and from the can so what -6 line (3/8")?
Replacing all the hoses with braided line as i do them if your wondering why lol

Yes mate -6

[wreckwriter]

Hey guys, sorry to resurrect an ancient thread but we G8 owners are just now trying to work out catch can installs for our L76s. The cans pictured here appear to be the elite engineering cans, yes? Assuming so, please, which bolts did you use for the actual can mounting?

Thanks!