catch can and pcv vent on DD

[AG 305]

ive searched and read everything i need to know about venting the pcv into a catch can. now why exactly isnt it recommended for a car that sees regular street use?

i know the oil tends to get contaminated more and has to be changed more often but what else is bad about venting the pcv on a daily driven car? under boost it relieves a hell of alot of pressure but what about during vaccum?

only reason i ask is because im looking into buying a nice catch can and would like as much crank case ventilation as possible.

another thing! where can i get one of those oil caps with a vent on it? i see them on alot of cars but cant seem to find where to buy one.

 

[BoostedBeater]

The simple fix to this would be instead of open atmosphere vent, just run a line to your intake tube pre turbo. It will continuously pull a vacuum, even under boost.

 

[tazndrew04]

from what ive read is that it removes all that extra gas from the oil. Maybe im wrong but thats what i understand is the purpose of an oil catch can?

 

[Gstclipse69]

OP: Where are you going to place the catch can? Inline with the breather from the valve cover or inline with the Pcv?

The purpose of an oil catch can is to "catch" oil that is running through these vacuum lines. When not under boost the pcv line is open, to provide vacuum to the crank case. Oil will get in this line and make its way back into the intake manifold. Same goes with the breather port on the valve cover. Under boost the pcv will close and the breather line will allow the crank case not to be pressurized however oil can make its way through that line and get oil in the intake pipe, turbo, and intercooler pipes.

 

[AG 305]

OP: Where are you going to place the catch can? Inline with the breather from the valve cover or inline with the Pcv?

i plan on using a catch can with 2 inlets so i can vent both the pcv and the left side of the valve cover without having to use 2 catch cans. i currently have a breather filter on the left side.

The simple fix to this would be instead of open atmosphere vent, just run a line to your intake tube pre turbo. It will continuously pull a vacuum, even under boost.

i dont have that line no more. i got an intake pipe that has no fitting for it so i had to put a breather filter. i much rather have a catch can though and especially one that i can connect my pcv to instead of the IM. like so...

RRE I/C Pipe Installation Instructions

THIS is what had me post this whole thread in the 1st place. in the 1st box under OPTIONS it says "cars that never see use on the streets"

 

[v8s_are_slow]

I'm looking into this as well. I don't wanna build a bunch of pressure, nor do I wanna do anything that'll hurt my my motor either. I have an FP intake pipe I've thought about just tapping to put a fitting on. But wondering at what point I'd need something bigger or better. I see sooooo many picture of people with catch cans that have a filter on top. But the one article I read on here said to stay away from those. Hmmm...

I did buy one of those plastic check valves to go between the pcv and intake, but just haven't put it on yet though.

P.S. Oh yeah, and is there a point to where you'd want an intake pipe without a nipple for the valve cover vent line to attach to for vacuum? I mean, if company's sell these without the nipple, I'd figure there would be a reason why. I just don't know that reason though.

 

[Gstclipse69]

In that article they are taking the pcv valve out and just putting in an open port. They are doing this to add in crankcase ventilation because in stock form, under boost the pcv valve closes and the only ventilation under boost is through the vent on the side. The down side to this, if you take the pcv out, is there wont be any vacuum to ventilate the valve cover when not in boost. The breather could provide some vacuum if hooked to the intake pipe, but not as much as the intake manifold.

 

[v8s_are_slow]

What? You won't have vacuum if you hook the breather to the intake manifold. Well, you will, but you'd also have boost going through that line.

 

[EclipticalGS]

Do it the way i did it, minus the top of valve cover fittings...


This shows my custom catchcan, (2) inlets on top, (1) outlet on the side.

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(1) outlet line runs to turbo intake pipe..

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Easy and simple.

 

[Gstclipse69]

That looks pretty cool. Are those faucet supply lines? The catch can is not vented correct? What did you do to get the fittings on the valve cover?

 

[EclipticalGS]

yeah I used a compression fitting 90* with copper crush washers where it mated against VC and underneath VC. Also a little Black rtv around the threads to make sure it sealed and doesn't move.

This involves taking out your baffles and re-welding it back in though, so not for the everday person.

Catchcan is a 1 liter made by me, and sits directly on what the Cruise solenoid used to sit on, barely any modification just trimming.

and no, in picture two you can see where the hose comes into the intake pipe..the hose hooks onto the backside of the catchcan where you can't see it.

Some may not like it, but its for function, not looks..Although my girlfriend is picky and on her car I used real an fittings for her because she wants looks and is looking for a lot of flow.

 

[AG 305]

Do it the way i did it, minus the top of valve cover fittings...


This shows my custom catchcan, (2) inlets on top, (1) outlet on the side.

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(1) outlet line runs to turbo intake pipe..

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Easy and simple.

thats what im talking about! everything vented.

you dont have any blowby or nothing like that running it how you have it do you?

is that your daily driver? what are the + and - ?

im thinking of eliminating the whole pcv system and just running a check valve between the IM and catch can.

OH AND ANOTHER THING! what about cars with standalone systems or SD that dont use intake pipes? im sure none of them want excess crankcase pressure. how do those people run fine without the need of the VC breather line or nothing like that? im talking street cars NOT full race non daily driven cars.

 

[v8s_are_slow]

^^^That's a good question. Another thing I'm wondering is, is there any reason I WOULDN'T wanna tap a fitting in my FP intake pipe to run a vacuum hose to my valve cover? I never see anyone do it, and I don't think they even offer it as an option.

 

[Gstclipse69]

I dont see a reason why you wouldn't want to drill and tap a fitting. I dont think I've seen any with an option for a fitting on it when you buy it, but I have drilled and tapped a fitting in my intake pipe and seen many others that have done it as well.

 

[EclipticalGS]

For all of you wanting to know, I am drawing air FROM the catchan with my Intake pipe with a 1/2" hose, picture #2 shows the hoseclamp and hose, and the air is then being drawn through my catchcan ports that are going to my VC...

so as im even just cruising my intake pipe is drawing whatever air it can find in the crankcase, so good in fact when I took the hose of the intake and sucked through it, it would hold vacuum until I pulled my dipstick out and fresh air would start to draw through.

Also when in boost your intake pipe is under decent vacuum (air entering turbo) and i should never see any blowby thats too much for my intake pipe to suck out...Make sense??

If you have an intake pipe, Thats the way to go, Plumb your valve cover breather, and PCV breather (get rid of pcv valve because intake pipe never sees boost) and route those to a catchan, and then have your intake pipe drawing off your catchcan. So if you have an Intake pipe, instead of venting, just run the hose to it.

Make sure to have a catchcan though, just running your breather/pcv to the intake with no catchcan results in oils entering your turbo and sludging up your intake manifold overtime.

For all of you visual people, Heres how I explained it for my buddy.

If you want to go the easy route, tap both the valve cover breather/ pcv port with an 1/8th pipe tap, go get some 3/8" barbed to 1/8" pipe fittings, run the 3/8 rubber hoses (autozone) to your Catchcan, and do the same but a 1/2" line to your intake pipe..So now you have one 1/2" hose drawing through two 3/8" hoses. Pretty unrestrictive.

P.S.- Sorry its on paint, i could've done it on CAD but I use that program every day for work so anytime I can get out of using it im down. , also if anyone wants some tips on how to make a scavenge effect CC, i can give you some tips, I fully tigged mine with stainless sheet/ and also, Yes I plan to DD this car for a while, This is a Proper set-up so I am not worried.

 

[KaLo_o]

thats the route i will go.....except for one thing, i would definitely not run the line that goes into the intake pipe at the bottom of the oil catch can that will suck all the oil imaginable back into the intake pipe and into your turbo etc.... i would put the line from the intake pipe as high up possible on the catch can

 

[nightracer91]

Do any of you have problems with too much oil being caught up in the baffle of the valve cover? I have oil leaking from the weep hole in the "front" of the valve cover and done the head onto the exhaust manifold. I don't think it is a pressure problem, but it seems like the oil isn't making it's way into the catch can but instead settling in the baffle then coming out the weep hole. Any thoughts?

 

[v8s_are_slow]

thats the route i will go.....except for one thing, i would definitely not run the line that goes into the intake pipe at the bottom of the oil catch can that will suck all the oil imaginable back into the intake pipe and into your turbo etc.... i would put the line from the intake pipe as high up possible on the catch can

Dude, the oil lubricates the turbo as well as coats the inside of the piping for better lubrication and so that the air will flow through the pipes easier. What a newb

 

[sexystover]

Do any of you have problems with too much oil being caught up in the baffle of the valve cover? I have oil leaking from the weep hole in the "front" of the valve cover and done the head onto the exhaust manifold. I don't think it is a pressure problem, but it seems like the oil isn't making it's way into the catch can but instead settling in the baffle then coming out the weep hole. Any thoughts?

the weep hold never goes into the inside of the valve cover, it passes through into the sparkplug wire area if you have oil coming out the weephole in front then that means its filling up where your plug wires go or that you have a crack in your valvecover

 

[Ineedboostman]

Could you put a one way check valve between the catch can and intake pipe to insure you won't get any oil in the intake. But then if you do that your creating alot of pressure in the the catch can under boost correct? So you could put a a breather on the catch can with a check vale to relieve pressed under boost and suck close under vacuum and the intake hose check valve closes under boost and opens with vacuum.

Now that I think about it a little more this wouldn't work because your always pulling a vacuum on the hose between the catch can and intake correct? Then that check valve would never actually open. So is there really any way to completely eliminate oil getting into your intake? Anyone want to chime in.

 

[TSi Kid]

Where does the second catch can go?

 

[Ineedboostman]

Anyone want to chime in?

 

[GIRman67]

I'm by no means an expert on catch cans and what would work and what wouldn't. but would something like this make sure you would get as little oil to the intake as possible?

the Oil goes in through the 2 inlets while the air outlet is separated by a sheet of metal so the oil doesn't have as easy of a chance to get it and if it does somehow get picked up into the air hole inside there is a second resivoir. Like I said I know nothing about cathcans but it looks like it will work

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Also I'm absolutely terrible with paint and have no other tools

 

[Ineedboostman]

Think I'll go that route

 

[crazyboy81]

So what's wrong with how my IP and breather is run?

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