Systemmax 2 Puffing Smoke From Rear Port

[sen2two]

The port in the rearmost part of the lower intake in "puffing" smoke out. It has the mesh screen installed. It was still pretty clean when I installed it a few months ago.

My guess is because I have no PCV system, and I have to much crank pressure...? I have a cap on the valve cover oil fill port, which was previously a large breather. And the port on the side of that, which would normally lead to a vacuum on the manifold, is just an open hose ran down towards the ground. which was previously a small breather...

Motor is a non-roller (1980's I think) 306, Keith black flat top pistons, GT40P heads, BBK Long Tubes, and all the other bolt on stuff... Compression is around 9.5:1, give or take. Pretty common average set up.

I have a complete Novi 1000 set up ready to go on. But before I do this, I need to work out every last detail. I plan to run a catch can set-up to hopefully relieve this excessive crank case pressure. My idea is: Run one -8an Hose from each valve cover to a sealed tank (no breather). Then run one line from that to the large vacuum port on the intake manifold. But I'm curious if i need an actual PCV or "Krank-Vent" somewhere?

Would this be suffice?

 

[General karthief]

Maybe we should move this to the tech section where you can get some advice, I'm not familiar with systemmax 2 intake.

 

[liljoe07]

Need to hook the PCV back up to the intake and hook the valve cover line back to the throttle body.

Edit: I skimmed, your idea will work, but it must be vented. Two lines to the catch can with a breather.

 

[TOOLOW91]

The port in the rearmost part of the lower intake in "puffing" smoke out. It has the mesh screen installed. It was still pretty clean when I installed it a few months ago.

My guess is because I have no PCV system, and I have to much crank pressure...? I have a cap on the valve cover oil fill port, which was previously a large breather. And the port on the side of that, which would normally lead to a vacuum on the manifold, is just an open hose ran down towards the ground. which was previously a small breather...

Motor is a non-roller (1980's I think) 306, Keith black flat top pistons, GT40P heads, BBK Long Tubes, and all the other bolt on stuff... Compression is around 9.5:1, give or take. Pretty common average set up.

I have a complete Novi 1000 set up ready to go on. But before I do this, I need to work out every last detail. I plan to run a catch can set-up to hopefully relieve this excessive crank case pressure. My idea is: Run one -8an Hose from each valve cover to a sealed tank (no breather). Then run one line from that to the large vacuum port on the intake manifold. But I'm curious if i need an actual PCV or "Krank-Vent" somewhere?

Would this be suffice?

Yes you need to vent the pressure somewhere. I have this same setup but win the pcv completely plugged and the catchcan has an open breather .

 

[sen2two]

Ok, so why does the catch can need a breather? If it's already "breathing" from the port on the intake manifold. Wouldn't it'd be more beneficial to have a sealed catch can setup. If the catch can has a breather on it, the vacuum pulling from the manifold becomes more or less useless.

 

[liljoe07]

You are talking about installing a supercharger. If you plumb the line from the catch can, to the intake. You will still have pressurized the crankcase through the catch can line.

 

[sen2two]

I realise I didn't mention it now. But I would use one of those 1 way valve Krank-Vents in between the tank and Intake.

 

[liljoe07]

I understand the theory behind those. My thoughts have always been that when you need the ventilation the most (during boost), that those dont help anything. It would block boost from the crankcase. But all the pressure building up during boost in the crankcase, still has no where to go. Granted, once you get back to idle, it would then vent the crankcase. But how do you know the crankcase wasn't still pressurized? A vented catch can insures you always have good ventilation under all conditions.