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LS1 PCV types

immortality

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This is the factory info/diagram for the VX LS series engine.
 

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07GTS

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So same as V6?
not sure but more then likely, its an emission thing so crank case to manifold so it sees vacuum and either/or rocker covers to intake before TB so its not under vacuum but consumes the pressure under loads/rpm
 

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V6 (Ecotec) PCV valve lives in the LIM. Totally different setup, goes direct from crankcase to intake, no hoses or external valve unlike the LS1
 

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LOL,

to quote the above page...

The engine ventilation system was developed to minimise oil consumption and ensure that oil ingestion could not occur during severe vehicle handling manoeuvres
Well I call that a total failure.... Well done GM.

Proper solution, fit a catch can!
 

Ginger Beer

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Do you have a LS1 or LS6 valley cover?

My 2002 LS1 had the LS1 valley cover but the LS6 intake manifold

LS1 has both head ports vented to single PCV into throttle body

I'm not sure how the LS6 PCV system routes though, it does have a PCV port on the valley cover though

As for heavy breathing, my blown LS1 is lucky to push 50mm of oil over 5k km

OEM routing from both heads to catch can, catch can into throttle body

I recover it from my baffled and fuel foamed SAAS catch can every service, my intake is as clean as a whistle
 

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Overall, when I search the part (pictured earlier) I get how it goes and is routed. However on mine, I can’t find how that matches up into my engine bay. The bends would have to be different.

I must be missing something.
 

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Or stuff was removed at some stage.

I did see a video somewhere that GM revised the rocker cover, in particular the baffle for the breather (more holes so the oil can drain out before going up the breather pipe). So the solution may be to remove the rocker cover and drill a few extra holes along the bottom edge to achieve the same effect.

In this pic you can see the Holley has extra slots along the edge to allow oil to drain out of the baffle.
 

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I installed Mines baffles in my old R33 Skyline, running a RB25/30 and a old to4z to 17 psi making about 500hp

FF the vid to the 13 minute mark


If your getting some blowby through your PCV this works quite well

I actually added fuel foam into the top of my SAAS catch can to strip more oily air from the system, not that my engine is pushing alot of oil anyway

I'm sure you could add some under the oem baffles, a strip of foam only costs about $20
 

Fu Manchu

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Ok. So I got access to my laptop.
Screen Shot 2021-06-22 at 1.33.00 pm.png

There was a revision between VY2 and VZ. VZ with electronic throttle body seems to use a PCV set up like the V6, in that its a restrictive open valve with no internals. Comes from the Valley Cover. I have the correct hose for that.

The left rocker is plugged at Holden and that plug is illustrated in fig 6A3-25. There is no ventilation on that rocker at all.

I am going remove the rockers and get new gaskets and bolt seals in them, so will be good to see if its all gunked up or not.

The left rocker is a fresh air vent tube.

I've checked, VZ GenIII, VZ 06, and the 06 Update and all are the same routing for the Crank Case Ventilation and PCV.

Screen Shot 2021-06-22 at 1.49.27 pm.png

Then I found a photo of a lefthand drive GTO that appears to have the PCV pipe described and posted by you guys, fitted a bit different, around the front maybe? That intake pipe is the same as mine.
 

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Screen Shot 2021-06-22 at 2.06.28 pm.png

If I go to VY series 1 I get the set up described bay you guys.
Series 2 VY goes to similar diagrams as all VZ, and has the same capped off left hand rocker vent hole
 
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