PCV vent to atmosphere on LNF, or delete PCV in the intake and vent the crankcase to atmosphere?

This motor is in a rock crawler and sees extreme angles and occasional rollover. Pulling in oil and hydrolocking or damaging the motor is the main concern. At extreme angles youll start smoking like crazy as it burns off the oil going places it shouldn't...

LS motors are super popular in the offroad and most guys vent to atmosphere going around 3 sides of the motor and then running that tube down past the bottom of the oil pan.

 

Our PCV is in our intake manifold which makes a modification a bit more difficult. What I did was I cut my intake manifold open and plugged the PCV hole inside the manifold. I also made my plenum larger but you wouldn't have to do that. You can either weld the intake manifold up and leave it like that if you'd like. I tapped a NPT fitting into the PCV port and added an AN hose to my catch can. Hopefully this helps you out a bit.

 

To clarify you pulled the intake off, took the plastic PCV piece out and then used something to plug that port? What did you use to plug the port?

Then on the outside there is the braided PCV hose that goes to the turbo. Did you just add a catch can but that still runs to the turbo, or did you plug the hole in the turbo and just run that line to the catch can?

 

I plugged the PCV port on my manifold using a 1/8 NPT plug. The hole is just the right size to tap with a 1/8-27NPT. I did that so I could route the crankcase vent to an air/oil separator before returning it to the intake, keeping the stock PCV valve inline.

 

The NPT plug idea is much easier than what I did. I went the route of cutting the manifold to add in the plenum spacer but also to make my PCV system more efficient. Plugging the hole will obviously take the manifold vacuum away from the crankcase and the intake will be the only vacuum source for the crankcase.

 

When I said intake, I meant the manifold. I tapped a hole in the manifold on the side where the crankcase vent is, which is routed to the AOS inlet, and then another hole in the manifold before the valves for the AOS outlet where the stock PCV valve sits inline.

 

You kinda did the same thing as I did but in just a different way it sounds. I'll try to find the pics of what I did to my manifold.

 

do you guys have a photo of what you guys did? what are the benefits for it?

 

Here is how my vacuum PCV is configured.

 

so what exactly does this do? is an oil separator different from a catch can?

 

It works like a catch can, but it returns the oil back to the pan through the dipstick tube.

 

thanks man!

 

i dont see why u couldnt just block the port and put a oil cap breather on it. should work fine.