420A 2gNT Oil Catch Can question

[inferno617]

I'm looking at getting an oil catch can for my 420a. I'm trying to figure out where to hook it up. Something I saw said go from the valve cover back into the intake, does this sound correct? Does this replace the pcv? If any one has pics please let me see so i can get a better understanding.

 

[Flipboi89]

It connects to the oil breather, yes where it would normally connect back into the intake.

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[kergilman]

Your PVC valve (from facing the car) will be on the left vent pipe (above the "D" on the valve cover and connect to the throttle body ( w/ pcv in the middle) and should stay there. The oil catch can should connect to the right vent pipe (above the 2 on the valve cover) go to the catch can and vent to atmosphere (especially if you do put a turbo on it).

 

[inferno617]

Okay, i just purchased an oil catch can. I do not have a stock intake manifold, I've got a venom. I plan on going from the valve cover to the catch can, which i will put where the air condenser canister goes ( i eliminated the ac all together) then route a hose to the back of my manifold with the pcv in the line.

 

[VelocitàPaola]

The catch can should just go inline between the intake manifold and valve cover. If the catch can has a check valve built-in, you can remove the stock PCV valve (intake manifold --> catch can --> valve cover). If it doesn't (which is likely), then keep the stock PCV valve (intake manifold --> PCV valve --> catch can --> valve cover). The whole system should be sealed and not have any "vents."

 

[inferno617]

it comes with a valve that i can put in, should i use the one they give me or my pcv?

 

[Kyle97-clipse]

Okay so Is this setup right???

 

[VelocitàPaola]

As long as there's a check valve within the catch can, it looks like yours is set up correctly.

 

[rshissler]

you really dont need the PVC valve inline unless your boosted.

 

[VelocitàPaola]

you really dont need the PVC valve inline unless your boosted.

That's not necessarily true. The PCV valve was originally put there for a reason. It keeps the amount of air entering the engine through the PCV system at a constant amount. If there's no valve, the amount of air entering is unpredictable and makes it difficult for any ECU (stock or aftermarket) to make the appropriate adjustments to the fuel trims.

 

[fhudsonjr]

The catch can should just go inline between the intake manifold and valve cover. If the catch can has a check valve built-in, you can remove the stock PCV valve (intake manifold --> catch can --> valve cover). If it doesn't (which is likely), then keep the stock PCV valve (intake manifold --> PCV valve --> catch can --> valve cover). The whole system should be sealed and not have any "vents."

Let me test to see if my understanding is correct. I have a 93 N/T (which will soon be turbo'd).

I run a hose from the PCV on the VC to the catch can and then a hose from the catch can to the intake manifold. Correct?

What about the hose from the VC to the intake hose(couldn't think of what that hose is called)?

 

[VelocitàPaola]

Let me test to see if my understanding is correct. I have a 93 N/T (which will soon be turbo'd).

I run a hose from the PCV on the VC to the catch can and then a hose from the catch can to the intake manifold. Correct?

Correct.

What about the hose from the VC to the intake hose(couldn't think of what that hose is called)?

Just leave that as is, or remove it, cap the port on the intake and install a breather filter on the port on the valve cover.

 

[inferno617]

Kyle97-clipse that picture is perfect for me especially because i just got the same exact catch can.

 

[Kyle97-clipse]

Well I'm glad I can help you

 

[style619s]

ok so im boosted and i was thinking about getting a catch can..... so u have to take PCV off ??

 

[Kyle97-clipse]

NO look at my diagram and just do that

 

[EDM95]

So how exactly does this work and why?

 

[style619s]

relax!

 

[EDM95]

I just never knew what it was and want to know?

 

[Kyle97-clipse]

Take a look at this thread



http://www.dsmtuners.com/forums/newbie-forum/307967-catch-can-nt.html

 

[VelocitàPaola]

So how exactly does this work and why?

The PCV system draws blow-by from the crankcase into the intake manifold, and eventually the engine, to dispose of it via combustion. A catch can just collects this blow-by and stores it.

ok so im boosted and i was thinking about getting a catch can..... so u have to take PCV off ??

The PCV valve is essentially a calibrated check valve. It serves two functions. The first is to deliver an accurate amount of gases (air/blow-by) from the crankcase to the intake manifold. The second is to ensure gases travel through the PCV system in only one direction. This function prevents engine damage in the event of backfire in N/A applications, but also prevents the crankcase from becoming pressurized in turbocharged applications. So, no, do not remove any portion of the PCV system.

 

[fhudsonjr]

Correct.



Just leave that as is, or remove it, cap the port on the intake and install a breather filter on the port on the valve cover.

Can you route this hose to the catch can so oil mist goes there whether N/T or turbo?

The PCV system draws blow-by from the crankcase into the intake manifold, and eventually the engine, to dispose of it via combustion. A catch can just collects this blow-by and stores it.



The PCV valve is essentially a calibrated check valve. It serves two functions. The first is to deliver an accurate amount of gases (air/blow-by) from the crankcase to the intake manifold. The second is to ensure gases travel through the PCV system in only one direction. This function prevents engine damage in the event of backfire in N/A applications, but also prevents the crankcase from becoming pressurized in turbocharged applications. So, no, do not remove any portion of the PCV system.

If you route the hose from the PCV into the catch can, how is the pressure from the crankcase relieved?
If the crankcase pressure is not relieved does this prevent good ring sealing (again...for N/T or turbo)?

 

[VelocitàPaola]

Can you route this hose to the catch can so oil mist goes there whether N/T or turbo?

No. In a properly functioning PCV system, fresh air is drawn in through this port to help evacuate the crankcase of blow-by. If you cap this port or connect it to a sealed catch can, the PCV system can no longer function. Oil won't leave this port due to several baffles and the fact that vacuum keeps fluid flowing in one direction only.

If you route the hose from the PCV into the catch can, how is the pressure from the crankcase relieved?
If the crankcase pressure is not relieved does this prevent good ring sealing (again...for N/T or turbo)?

The addition of a catch can (if done properly) should keep the PCV system sealed. Fluids can still freely move from the crankcase to the intake manifold, they just pass through the catch can first.

 

[fhudsonjr]

Thanks, Paul. I think I understand.

 

[style619s]

The PCV system draws blow-by from the crankcase into the intake manifold, and eventually the engine, to dispose of it via combustion. A catch can just collects this blow-by and stores it.



The PCV valve is essentially a calibrated check valve. It serves two functions. The first is to deliver an accurate amount of gases (air/blow-by) from the crankcase to the intake manifold. The second is to ensure gases travel through the PCV system in only one direction. This function prevents engine damage in the event of backfire in N/A applications, but also prevents the crankcase from becoming pressurized in turbocharged applications. So, no, do not remove any portion of the PCV system.

ok thanks Paul