PCV Modification and Education Thread

[alphaVR]

The only way to prevent oil from being in the IC lines, for ANY car, is to route the PCV vapors to somewhere else OTHER than the intake/charge system. Since you need a source of vacuum to properly vent the vapors, the only true option is a vent to exhaust. If going that route, I highly recommend putting a catch can before venting into the exhaust.

[FraggyA4]

The only way to prevent oil from being in the IC lines, for ANY car, is to route the PCV vapors to somewhere else OTHER than the intake/charge system. Since you need a source of vacuum to properly vent the vapors, the only true option is a vent to exhaust. If going that route, I highly recommend putting a catch can before venting into the exhaust.

You don't need a vacuum, you can easily run to atmosphere pressure without needing a vacuum.

[LoKisSpYdR]

The only way to prevent oil from being in the IC lines, for ANY car, is to route the PCV vapors to somewhere else OTHER than the intake/charge system. Since you need a source of vacuum to properly vent the vapors, the only true option is a vent to exhaust. If going that route, I highly recommend putting a catch can before venting into the exhaust.

I've been venting to my downpipe for about a year and 15k miles (+/-) and have had zero issues. Exhaust temps are plenty hot enough there to burn up anything you're dumping into it. You may expel some extra carbon but my whole house is LED and CFL so it's a push.

[alphaVR]

You don't need a vacuum, you can easily run to atmosphere pressure without needing a vacuum.

source of vacuum ensures that the crankcase is always in a state of vacuum, which in turn ensures the oil vapors don't deposit themselves back into the oilpan.

Yes, you can run to atmosphere, but I would feel far safer running with a vacuum source.

[LoKisSpYdR]

Like a Venturi in the exhaust.

[mec]

Like a Venturi in the exhaust.

Didn't lench or someone already try this and he found that it wasn't working at all.

[alphaVR]

Like a Venturi in the exhaust.

This. A few locals here run them, and have had them come on high recommendation, and everyone has nothing but excellent things to say with that

[houbaviy]

My question was about the stock setup. I understand that oil cannot be completely eliminated, but I have excessive oil accumulation in the turbo to intercooler hose. I assume the blowback passes through an oil separator regardless of whether the system is under turbo boost or not. How fail safe is the actual oil separator on the 2.0T? Everybody is discussing issues with the PCV valves as the cause for oil consumption issues. Is it theoretically possible for the PCV valves to be OK while the oil aerosols are not being efficiently removed com the blowback gases?

[fly300kts]

This. A few locals here run them, and have had them come on high recommendation, and everyone has nothing but excellent things to say with that

Well not so fast: I have that setup and I stepped away from it because the venturi is not efficient enough and you end up pressurizing the catchcan

Phil

[LoKisSpYdR]

Didn't lench or someone already try this and he found that it wasn't working at all.

aluthman was running it but had other issues. Like I said, I've been running it for 15k with no issues. Dozens of guys on Vortex and i believe Phil is also running it at this point too.
The biggest think is, if you're unfamiliar with fluid dynamics/venturis/Bernoulli effect, look at Corey's post on the previous page. Placement is EVERYTHING for optimum vacuum.

Edit: this is the post I was referring to:


Edit: Phil is not anymore.

[LoKisSpYdR]

Well not so fast: I have that setup and I stepped away from it because the venturi is not efficient enough and you end up pressurizing the catchcan

Phil

I never ran a catch can with my setup. It goes directly into the downpipe at the radius. It goes approx. 4.6" in.

[fly300kts]

Phil is not anymore.

LOL
I just extended the lines to the rear and done with it
BTW, last week I had to remove all the AWE piping and not a single drop of oil inside

Phil

[FraggyA4]

Been running to atmosphere for 10k without any sign of problem besides needing to heat the end of the hose to prevent ice from forming. Engine runs great, and engines have been running this way for quite a while. I do think that the exhaust idea is cool because it would prevent the line from freezing. However it adds complexity and atmosphere is easy.

[alphaVR]

Well not so fast: I have that setup and I stepped away from it because the venturi is not efficient enough and you end up pressurizing the catchcan

Phil

I find that intriguing. Do elaborate if you can.

[fly300kts]

I find that intriguing. Do elaborate if you can.

Not much to elaborate: Welded a Venturi tube at the proper location and angle
When you connect the catcan outlet tube, there is enough exhaust pressure to pressurize the can and since my can drain is connected to my oil pan, well you know

Phil

[LoKisSpYdR]

Not much to elaborate: Welded a Venturi tube at the proper location and angle
When you connect the catcan outlet tube, there is enough exhaust pressure to pressurize the can and since my can drain is connected to my oil pan, well you know

Phil

What size line were you using?

[fly300kts]

What size line were you using?

10AN

[LoKisSpYdR]

10AN

Me too.

...but you had the line going to the drain pan....

Just wondering what would cause it to pressurize. The Venturi itself should always be in vacuum unless there's an obstruction or a rapid pressure drop just after the Venturi.

[fly300kts]

well it's not
I have the 034 can who has a drain with a small silicone hose connected to the pan

Phil

[shiro1745]

Me too.

...but you had the line going to the drain pan....

Just wondering what would cause it to pressurize. The Venturi itself should always be in vacuum unless there's an obstruction or a rapid pressure drop just after the Venturi.

Somebody here installed a gauge and saw positive pressure from the Venturi. I forgot who it was.

[LoKisSpYdR]

I installed a pressure transducer when I was first experimenting with this and saw that vacuum in the Venturi was always greater than vacuum in the crankcase, so ptot will alway produce vacuum in the Venturi.

[fly300kts]

Somebody here installed a gauge and saw positive pressure from the Venturi. I forgot who it was.

I guess I am not the only one then.
3 locals have the same setup than me and two of us, randomly, have consequent smoke coming out the vent at idle. Just oily vapor but never got a drop of oil on the ground
Really can't figure out why

Phil

[LoKisSpYdR]

I guess I am not the only one then.
3 locals have the same setup than me and two of us, randomly, have consequent smoke coming out the vent at idle. Just oily vapor but never got a drop of oil on the ground
Really can't figure out why

Phil

Wait! So you have a vented CC?
What about the others? Straight like mine or CC? Vented or unvented?

The vent in the CC may be enough of a differential to create a drop in vacuum enough to release passing steam.

[fly300kts]

All with the same vented CC

Phil


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[LoKisSpYdR]

All with the same vented CC

Phil


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Definitely think the vent is what is causing it, but not sure why only some. If I had to guess, it'd be that the guys with the smoke coming from the vent have larger diameter exhausts than the guys who aren't having any leaking, but just a guess.

[fly300kts]

Yeah really puzzling
Phil


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[olethalb]

does anyone know if there is any restriction in the oil way housing (plastic part that bolts onto block)

i mean is the housing similar to 1.8t where vent is 'open' or is there any internal trickery / valves in the tfsi cc breather housing

i'd considered venturi but so many mixed reviews, if i don't run stock PCV i get smoke on idle but hate the oil vapours in my boost pipes and on the valves.

Olly

[Deacon_cs]

Is this ok or not???

I have two cars with low mileage doing this. (A4 b8 2010, Tiguan 2012)

It´s blowing through that "tunnel" on idle

[VRauza]

I have some idea, but not sure if that would be ok...I was thinking about putting B (back pcv) and C outlets together with a Y connector and then both to oil catch can. And then back from catch can to B (front)...what do you thin about that? Or the best way would be to just block the B outlet at the back pcv?

Ok so there seems to be no really clear description of where the crankcase pressure goes, I made this for another thread but I remember a ton of people in here after countless pages still asking simple questions.
Here's te system:

[Operator]

What am I doing wrong here?!? I tried to put a cap on the turbo side CC (instead of the filter), and the car about flipped out.

Ok, I went back and read the responses again. But just to clarify. I can/need to disconnect the N80 line that is going to the CC. What are other people that have gone BT doing with the rear pcv? Because both of my CC's fill up with gunk.

[shiro1745]

Ok, I went back and read the responses again. But just to clarify. I can/need to disconnect the N80 line that is going to the CC. What are other people that have gone BT doing with the rear pcv? Because both of my CC's fill up with gunk.

Where is your crankcase venting?

[Operator]

Where is your crankcase venting?

Into the passenger side CC.

[alexlm]

Hello guys I need you help. I did a front pcv block off plate install on my a4 b7 2.0tfsi and the car started throwing smoke like crazy as soon as the turbo spooled. Do I need to block the rear pcv? or did my turbo died :( Please help me, I am kind of confused with these dual pcv shit hahaha I'm ussed to the 1.8t so please help me!
THX in advance

[Charles.waite]

What you need to do is not block the PCV...

[alexlm]

why? the old one was dead, I did it on my 1.8t and I love it. Thease thread it about deleting it, so thats why I asked here... -_-

[Charles.waite]

It’s not though. I’m not trying to be rude but deleting and blocking off the PCV is a bad idea.

[oVeRdOsE]

According to this thread reading and my own experience, this will increase the pressure in the valve cover, the oil will try to go out, in my case it go out by the oil cap, and 'probably' by the valve cover seals to the combustion chamber (blow by).

I was on a fresh oil change, and on a 30 minutes ride, I got the low oil warning. ( I do not own a blockoff plate, but a frozen catch can, lol)

I know a guy with a blockoff plate on a mk6 golf R ( 1st gen 2.0t ) and he was ok. Not quite sure how it works.

also : http://www.audizine.com/forum/showth...of-the-exhaust

[Chris@EPL]

I have been running a block of for 5 years or more and just switched back over to the new updated PCV. Not sure if I will notice much of any change, but just felt like I should do it, haha.

[alexlm]

I have been running a block of for 5 years or more and just switched back over to the new updated PCV. Not sure if I will notice much of any change, but just felt like I should do it, haha.

did you eliminateed the rear pcv?

[bobbytomorow]

Will this block off plate work for this application?

https://www.ebay.com/itm/VW-Audi-PCV...VapK~z&vxp=mtr