Can someone critique my oil catch can set up?

[s13Yoon]

Not sure if I set it up correctly seeing as though there's multiple ways of doing it. http://i.imgur.com/mdCLAoo.jpg

[pablito_s13]

is the pcv plugged?


looks like it should work

[s13Yoon]

pcv as in the pipe on the top left of the valve cover? then yes

[Kingtal0n]

omfg do not block that off. Did you ever run the engine and put your finger over that thing? The valvecover will slowly pull engine vacuum at idle from the intake side, NOT GOOD. You will blow a gasket somewhere and possibly have to tear down the engine. Please do some searching there are hundreds of threads about how to run a catch can properly.

[Sileighty_85]

you are close, you need to run the capped Tee side to the turbo intake and cap the OCC vent thingy

[s13Yoon]

omfg do not block that off. Did you ever run the engine and put your finger over that thing? The valvecover will slowly pull engine vacuum at idle from the intake side, NOT GOOD. You will blow a gasket somewhere and possibly have to tear down the engine. Please do some searching there are hundreds of threads about how to run a catch can properly.

I did run my car and it can fine. I did do some research and I've seen some builds where they just put an L on the valve cover and run from the L to catch can to bottom hose of the engine. Could you elaborate on what you are saying?

you are close, you need to run the capped Tee side to the turbo intake and cap the OCC vent thingy

So run the current capped side to a nipple on the cold air intake and cap the what?

I think I know how I fucked up. Sorry guys. I saw this diagram just now.
http://www.sr20-forum.com/usergallery/1594db5da0dcf6b3.png
So it should go crank -> catch can -> T -> intake

[ultimateirving]

I did run my car and it can fine. I did do some research and I've seen some builds where they just put an L on the valve cover and run from the L to catch can to bottom hose of the engine. Could you elaborate on what you are saying?



So run the current capped side to a nipple on the cold air intake and cap the what?

I think I know how I fucked up. Sorry guys. I saw this diagram just now.
http://www.sr20-forum.com/usergallery/1594db5da0dcf6b3.png
So it should go crank -> catch can -> T -> intake

I dunno if running the bov like that would work
lol

[fliprayzin240sx]

^^^That's right, he got it re-circulated back after the MAF.

Personally, I like running an un-vented catch can between the T and the rubber turbo intake tract.

[ESCAPE!]

I dunno if running the bov like that would work
lol Umm thats how they should be. Recirculated when running a MAF sensor

[vas570sx]

i think what he's saying is, oil vapor can still move from the T to the intake tube..

[ultimateirving]

I did run my car and it can fine. I did do some research and I've seen some builds where they just put an L on the valve cover and run from the L to catch can to bottom hose of the engine. Could you elaborate on what you are saying?



So run the current capped side to a nipple on the cold air intake and cap the what?

I think I know how I fucked up. Sorry guys. I saw this diagram just now.
http://www.sr20-forum.com/usergallery/1594db5da0dcf6b3.png
So it should go crank -> catch can -> T -> intake

I dunno if running the bov like that would work
lol..
er nvm, i wasnt thinking clearly. Thought that was the vacuum tube. forgot people like to recirc

[s13Yoon]

Guys... I used the diagram for the catch can not the BOV portion....

[tauntdevil]

So what is the oil catch can for if the oil will just got in the other side and into the intake... wouldnt that make the oil catch can.. basically useless?

[ultimateirving]

So what is the oil catch can for if the oil will just got in the other side and into the intake... wouldnt that make the oil catch can.. basically useless?

No because the Pcv is a one way valve and closes under boost.

[Kingtal0n]

The engine is sealed up, thanks to oil seals all over the place. The only way for air to get out of the crank case, is past the piston rings (blow-by), or out from one of the two holes in the valve cover. One of those holes leads into the intake manifold, and when the engine is in vacuum, that will always allow oil vapor into the intake manifold. Nobody runs a catch can on that side, so every engine always breaths oil vapors, and blow-by vapors when off boost especially. Since that side is always vacuum, or shut, we consider it a constant vacuum for the sake of reference, since it never shows anything but unidirectional flow. Its supposed to be a one-way port OUT of the crank case.

the other hole, if blocked off, is no longer a hole. You are then ONLY sucking air out of the crankcase, applying your engine vacuum (some 15-18" of vacuum) to the entire crank case, putting that negative pressure on ALL your oil seals, until one of them pops and gets sucked into the engine.

There are plenty of other threads about where they *should* go. You just need to know why it can't be blocked off. If you put your finger over it, you would find that it gradually gets sucked into the engine, until engine vacuum is present at the surface of your finger exposed to the crank case side.

[EsChassisLove]

Why don't you guys put a catch can inbetween your PCV and intake manifold like I did.....

I got sick of having an intake manifold soaked in oil after 4000 miles even with a BNIB PCV and brand new engine.

Seriously.....You are worrying about the wrong side too much. I've never had a drop of oil get into my old catch can set up, which was routed properly to the intake pipe.

That intake manifold though....drenched. Nissan PCV sucks.

[EsChassisLove]

Top two lines are PCV valve and turbo inlet. The PCV is on the catch can, because obviously you don't want to pressurize the can...lines...engine.

Bottom two are to the valve cover.

Theres a lot of baffling in this can.

It fills up with water lmao. Started doing that ever since I switched to braided lines. Not sure what the deal is with it.


http://i.imgur.com/f9JGNANl.jpg

[feito]

have you guys found a pcv valve that doesnt leak? One that you have tested, pressurized under water. That is the only reason i hate pcv valves, they tend to leak, and well, although it wont give u a bad maf reading (recirculated occ setup) it will take some power and make your turbo work harder.

[EsChassisLove]

Yes. is called a one way check valve from Earls. Expensive....LARGE....but worth it.

[5280VertDET]

I have looked at the big ol' catch can thread for weeks and for the life of me I can't make heads or tails of how to hook up the greddy catch can... The theory makes complete sense, but the routing does not; especially involving the intake and the "T" on the valve cover. Any catch can guru's, stupid simple explanation would go miles. Because I planned on hooking it up similarly to OP.

[s13Yoon]

Well.... All in all, I ended up going crank to catch can. T to both catch can and intake.

[OutlawLui]

the sr has the most retarded catch can/pcv/breather set up ever ....

still love my sr though


*i had my pcv blocked for a while. But my catch can would fill up with oil and sludge super fast . So its back on

[EsChassisLove]

I deleted mine for awhile. Got 0 oil issues.

[derass]

That diagram has given me a new understating of how the breather system works. I was under the impression that oil vapour exits the valve cover, passes through the oil separator and built up oil returns to the crankcase.

Now I see that the intake pipe draws air from the crankcase, passing through the oil separator, as well as drawing air from the valve cover.

[Kingtal0n]

That diagram has given me a new understating of how the breather system works. I was under the impression that oil vapour exits the valve cover, passes through the oil separator and built up oil returns to the crankcase.

Now I see that the intake pipe draws air from the crankcase, passing through the oil separator, as well as drawing air from the valve cover.

The valveover "IS" the crank case. If you pull air out of the valvecover- you are evacuating the crank case.
think of the pressure in the valvecover as the pressure below the piston rings or in the oil pan.

[victme]

This is way off topic but do you have a vert???

[fliprayzin240sx]

That diagram has given me a new understating of how the breather system works. I was under the impression that oil vapour exits the valve cover, passes through the oil separator and built up oil returns to the crankcase.

Now I see that the intake pipe draws air from the crankcase, passing through the oil separator, as well as drawing air from the valve cover.

Yup, also the turbo sucks in the air from that line to help evacuate crankcase pressure. The problem you have with the OEM setup is the shitty buffling in the valvecover. Oil can easily get sucked out of the T into the turbo inlet and get oil all over your turbo compression side. Thats why the best place to put a catch can is between the T and the turbo inlet to catch the oil out of the T.