does the oil catch can need a breather

[winkdogydog101]

ok I wanted to get the 2 oil catch cans i saw on how to fix the pvc problem. Just wondering if the one that goes to the intake needs a breather also can i block it off on the intake and just put a breather cone on the side? rather then 2 oil catch cans?

 

[Calan]

http://www.dsmtuners.com/forums/articles-engine-fuel/366890-4g63t-pcv-system.html

 

[winkdogydog101]

thanks but i already read that i didnt see what i was asking

 

[Calan]

ehhh... then I guess I'm not sure what you are asking.

 

[snowborder714]

Are you asking if your catch cans should be 'vented' (breather filter on top of the can) vs. a sealed can? Or are you asking if you can just remove the hose from the valve cover to the intake pipe and put a small breather filter on the valve cover instead of a catch can?

Or maybe something completely different?

 

[JayRolla]

The crankcase needs to vent somehow. I run my pcv valve and valve cover lines to a catch can then let it vent off the can so it can releave the pressure. There are huge debates on correct ways to do this. The stock system is setup the best so I would leave it alone, maybe add a filter to keep oil out the intercooler piping and such.

 

[6boltpwr]

I think i might get what you are asking.

I would not just stick a breather valve on the PCV valve and call it a day. You want something to at the least collect and relieve pressure from the head.

My setup is i have the PCV valve going back to the IM. i have a -10an fitting welded on to my valve cover. ran fitting from the VC to a sealed catch can with a breather on top of the can to help venting. simple setup cost you around 100 bucks to your door.

Also note that messing with your PCV system can effect your emissions which is something to keep in mind.....meaning kepp all your parts you take off

 

[Calan]

... ran fitting from the VC to a sealed catch can with a breather on top of the can to help venting...

With a breather on top, that is not a sealed can.

This is all covered in detail in the article I linked to above, which is why there is some confusion on what the OP is asking. If he read and understood that article, there shouldn't be any questions about the pros and cons of running an open can with a breather vs. a sealed can tied to a vacuum source.

OP - Please clarify exactly what it is you are asking...maybe we are just missing something here.

 

[winkdogydog101]

well sorry for this but i mean the pvc valve should the can be sealed or vented? need to know fast.

Also the valve that comes from the left side of the valve cover to the intake can i just close that off and put a filter on it?

 

[Calan]

Ok... you obviously did NOT read the article I linked to in the second post, and I'm not going to type that all again here.

 

[winkdogydog101]

Are you asking if your catch cans should be 'vented' (breather filter on top of the can) vs. a sealed can? Or are you asking if you can just remove the hose from the valve cover to the intake pipe and put a small breather filter on the valve cover instead of a catch can?

Or maybe something completely different?

asking both of these questions

 

[snowborder714]

From the article:

3. Regardless of which type of cans are used, they should be sealed rather than open to the atmosphere. The inlet of the can should be connected to a line facing the VC, and the outlet should be connected to a vacuum source to help pull air through the can.

And you can use a filter on the side of the valve cover if you want. Just beware that you could find oil sprayed all over the passenger's side of the engine bay.

 

[winkdogydog101]

god damn so i really need 2 of them i was thinking i did but i didnt wanna pay the extra 18

 

[Calan]

Since you apparently want us to read the article to you, I'll help you out with a little more of it.

Empty cans like the ones commonly found on eBay for dirt cheap are going to do very little, if anything. There needs to be some type of filtering media in the can; preferably something that can remove sub-micron particles. Stuffing the cans with coarse media such as steel wool helps, but only to a point.

If only one can is to be used, put it between the VC and turbo inlet. There is much more oil and hydrocarbon vapor being pushed out of the VC while under boost than there is being drawn into the IM while under vacuum.

Important point #5: Catch cans should always be connected to a vacuum source to help pull air through them, rather than vented to atmospheric pressure.

 

[AG 305]

Are you asking if your catch cans should be 'vented' (breather filter on top of the can) vs. a sealed can?

THIS.

im about to buy 2 and i dont know which one is better for pressure relief. sealed or with filter on top?

 

[98awdturbo]

http://www.dsmtuners.com/forums/articles-engine-fuel/366890-4g63t-pcv-system.html

THIS

 

[jooc]

So the answer to this questions is 2 sealed catch cans... 1 from intake tube to valve cover... Other from PVC to catch can to a check valve to intake manifold.. To perform this correctly in a short answer.... If they were open.. Via intake manifold.. Wouldnt that be a vacuum (boost) leak?

 

[Calan]

If they were open.. Via intake manifold.. Wouldnt that be a vacuum (boost) leak?

Yep.

 

[dsmdeliveryboy]

I modified mine with a breather

 

[stikiller4g63]

I have a two catch can setup and it seems to work great..I created another breather on my valve cover to have two lines run into my catch can that vents out...my first impression was that if it created a bad vac leak by having it vented into the atmosphere, i would be able to vent it back into the intake...with a small fuel filter in between the line of the vent hole where the atmosphere breather would have been on and intake...but didnt do that set up and just had two breathers from the valve cover go into a catch can to relieve crank case pressure and vent into the atmosphere...I had my second catch can set from PCV Valve to intake manifold without venting it to the atmosphere

 

[Calan]

I have a two catch can setup and it seems to work great...

I always wonder what it means when people say this. With just an open can or breather, you will ALWAYS have some positive CC pressure with any blow-by; the question is how much? Is it enough to cause long-term issues with internal seals? Is it restricting oil draining from the turbo? Or is it really only slightly above atmospheric pressure at full boost? If you aren't measuring it, how do you know?

Why does nobody ever measure their crankcase pressure so they no FOR SURE whether their setup is working ok or not, especially if they are running something that is known to be borderline or less than ideal?

 

[fordman]

Completely missing from this conversation is the fact that a sealed system with or without an oil catch can (with no filter!), brings extra air with it's horsepower boosting oxygen, into the intake manifold. Venting or disconnecting that system is just plain wrong if you love HP and clean intake valves (with the filter free catch cans) like I do.

 

[Boomdeeze]

Completely missing from this conversation is the fact that a sealed system with or without an oil catch can (with no filter!), brings extra air with it's horsepower boosting oxygen, into the intake manifold. Venting or disconnecting that system is just plain wrong if you love HP and clean intake valves (with the filter free catch cans) like I do.

Nice troll attempt, I've seen a lot better though..

 

[Turbo2g]

I finally got around to reading this thread. Look, the PCV system must be sealed. Intake vacuum pulls the crank case vapors through the one way check valve, aka PCV valve. How can it work if there are breathers? Intake vacuum will draw from the path of least resistance and create a vacuum leak from any breathers in the system. These breathers are installed in the system after the MAF's metered air and therefore unaccounted for. Do not run breathers. Install a catch can and leave the system sealed. I'll bet so many people have crappy running cars out there.. I've diagnosed many P0171 codes (system too lean) just from cracks in old PCV lines. Imagine a breather!? What are you guys smoking. Professional technician here, take it or leave it. I'll only say it once. Seal your systems. It is the right way.