Oil Catch Can Question

[aerospike2002]

Ok, I seem to be getting differing opinions based on searches I did here.

Brand withstanding, I need to know the most effective way to use an oil catch can.

First, is that brass little pipe thing on the GTS valve cover the PCV? Or is that the breather that Stafford installed? If so, is the PCV plugged now? Or is the PCV still attached to the intake piping next to the throttle body? Where is the PCV?

Second, when installing an oil catch can, should I use the PCV or not. Boosted said no, but some other guys that know about turbo stuff said yes.

Without the PCV being used, I understand that I run a hose from that brass fitting thing on the valve cover to the inlet of the catch can, and then run a hose from the outlet of the catch can to a nipple on the intake tubo as close to the TB as possible. Then would I plug the PCV if not already plugged?

If I did use the PCV, I'm completely lost as to how to connect this thing.

[Bing]

Check PM, PCV should not be capped IMO.

[aerospike2002]

Thanks Bing...any other responses?

[mtskibum16]

I am interested in this too. Any help would be appreciated.

[King Torq]

a N/A engine's intake tract is always under vaccume, so any line tapped from it will show vaccume.

the pcv (positive craincankcase ventilation) is a vaccume line (from intake) that sucks cranckcase pressure (in some cars tapping directly into the crankcase, and for use, tapping into the valve cover where the valve cover is equalized with the crankcase via oil galleys. So, as combustion gases escape and over venting occurs, the exas is sucked into the intake for reburning.

Now we add a turbo and a few things change. first, that intake pipe is no longer just a vaccume, as it becomes presssurized under boost. That means that instead of releaving crankcase pressure via vaccume, if the line was left unchanged, then the turbo would be pressurizing the cranckase directly. At just a few pounds of boost, the valve cover seals should burst propmty.- so we need to, at the very least end boost from going back into the crankcase.

Some go the route of a one way check valve. This blocks boost pressure from going into the pcv, and allows venting on decel, but when venting is most critical, that us, under boost, it does nothing.

choice two, most common. A a breather or catch can at the pcv (on the valve cover) and cap the intake hole. The intake hole is capped so keep the sysetm sealed so you dont loose boost, and the crankcase is now vented via a simple breather. If you are passing too much oil, consider the catch can this way... line from the pcv/valve cover nipple to the can, breather on top of the can, cap the other exit from the can, call it a day. If you need more venting, you can use the out from the can, using a one way check valve, and tap back into the intake pipe, but then you needd another check on the actual filter side, so when under vaccume, the system is sealed (not sucking from the oil breather into the intake), and when under boost, it simply vents to atmosphere, and a diff. ck vlave stops boost from hitting the pcv.

hope this helps. For my part, i just have a breather on the valve cover and capped the intake line, and plan to use a line from the pcv to a can, breather on can and cap the extra line off the can.

[Asha'man]

Nice Info @Torq!

[Immo]

What I did was the following:
I routed a tube from the PCV to a y-splitter which also has a tube coming from the valve-cover. The other side runs to my oil catch can. the outlet of my oil catch can goes to the intake before the turbo (there's always vacuum there).

That way no oil gets into your engine bay and al stays nice and clean..

[twistedGTS]

I'm using a PCV valve. No oil catch. Working good so far.

[aerospike2002]

IMMO,
So many ppl say not to use the PCV incorporated into the system. But yours is working for you?

@Torq....good info x 2. So basically you would only be utilizing the inlet of the catch can, and then cap the outlet? Seems like there would be no vacuum to draw the oil into the catch can.

When you refer to the intake piping, are you talking about the piping that has a filter at one end? Or are you talking about the piping going into the throttle body?

[aerospike2002]

Ok, where in this picture of my engine is the PCV? On the valve cover, there are two little nozzles sticking out. One has the big rubber black tube connected to it. The other is a little brass tube right behind it? I see little puffs of smoke coming out of the that, which I know is vaporized oil since it smells like such. Is that the PCV? What, then, is the one called that has the big black tubing connected to it?

http://img.photobucket.com/albums/v167/aerospike007/T2.jpg

But some of you guys have been talking about tapping into the valve cover fitting (which must be this) and then there exists a separate PCV. I am missing something here.....

[aerospike2002]

Here's an even better picture from a member's 2zz here. Which one of the two outlets is the PCV?

IMMO, are those the two outputs that you joined together via a Y-coupler, and then that single hose went to the inlet of your catch can?

http://www.spydermagazine.com/files/oilcatcher%200011.jpg

[Immo]

Well, since I am running the tube from the PCV + valve cover TO the oil catch can and a tube FROM the oil catch can to the intake piping (NOT the compressor side) there will never be pressure on the pcv or valve cover, only vacuum since the air is beng pulled in there

I'll take pictures tomorrow when I get my digital camera back..

[aerospike2002]

But is either of those nozzles in the above pic the PCV or valve cover one that everyone refers to?

And what do you mean by "not the compressor side"....aren't you connected to the intake piping with the Apex'i filter on the end? There is only one of those, so how would I decided between a compressor side and non-compressor side?

Looking forward to those pics....

[Immo]

Well, one of the holes isthe PCV, but I have a GT so I am not sure which one. Should be on the forum here somewhere.

Yes, it is connected to piping where the apexi-filter is on, so the piping where the turbo sucks air through

[Black_TRD]

Originally posted by aerospike2002
Here's an even better picture from a member's 2zz here. Which one of the two outlets is the PCV?

IMMO, are those the two outputs that you joined together via a Y-coupler, and then that single hose went to the inlet of your catch can?

http://www.spydermagazine.com/files/oilcatcher%200011.jpg

the one on the right with the oil catch can connected is the PCV the left one is the breather

[aerospike2002]

^^THANK YOU!!!!!!!!!!

I can finally make sense of it all

[King Torq]

Originally posted by Immo
the outlet of my oil catch can goes to the intake before the turbo (there's always vacuum there).
cool as long as you use the can, and a good lenght of line to 'condense' any oil misting that may make it through a short line- you dont want 'oil condensation' or misting to add turbulence to your turbine.

FYI- the pcv is one part venting our pressure, but is also one part emmissions (exhaust gas recirc, to burn up that crap). The emmisssions goal of putting it back into the engine is not important to me, however, allowing pressure to leave the crankcase is, just putting a breather on it is ok, but messy. what i am suggesting is bassically a relocated breather with a cath on it- to keep things clean inside the engine bay-


comming for the V8 world, there is a pcv located in the lower intake that vents directly from the crankcase. most people keep this intact and add breathers on the two valve covers,.. then wonder why they are running lean. Unmetered air sucks down from these breathers on the valve covers, down into the crankcase, then up and out the pcv into the intake- a bad thing. The deal is to cap the intake vaccume and vent it all (breather on valve covers and pcv at engine), or keep the engine sealed, use the factory pcv, add a one way check valve to guard against pressurizing the crankcase, and an inline oil filter (visable) or catch can (non vented) so you can monitor oil volume running the 'wrong way.'

make sense... just knowing how the system works, one can fathem 100's of solutions

[ztan]

removed my post due to misleading information.

[aerospike2002]

Dang it....I'm going to have to get someone to install this for me. I am completely confused again.

Torq, I'm going to PM you about it.

[Boosted2.0]

Look its very simple on the GTS - the hose that goes to the manifold side of the throttle body leave alone. Its the pcv hose. The other hose is the breather. It is meant to go to a filtered inatke air source at atmospheric pressure. It allows blowby to vent out into the intake when necessary. Put a nipple just behind the filter and thats where you hook it up. The oil catch goes in that line. Plug the nipple on the throttle body in front of the throttle plate where you took the hose off and you're done.

Its that simple.

[Black_TRD]

Originally posted by Boosted2.0
Look its very simple on the GTS - the hose that goes to the manifold side of the throttle body leave alone. Its the pcv hose. The other hose is the breather. It is meant to go to a filtered inatke air source at atmospheric pressure. It allows blowby to vent out into the intake when necessary. Put a nipple just behind the filter and thats where you hook it up. The oil catch goes in that line. Plug the nipple on the throttle body in front of the throttle plate where you took the hose off and you're done.

Its that simple.

so theres no problem with the pcv when boosting?