PCV Modification and Education Thread

[kaz02a4]

I'm not confused about the flows. What isn't clear to me is how the pcv works internally. For example, if it has a valve that requires pressure from the im to open the rear port, this won't work. If it is completely passive, then it will.

I see where you're going with this. I'll try to draw a diagram of it later of what I think is the setup, but we really need a pcv torn down to look at valve placement.

Ideally, I'd want to see a straight connection between B and C, with a valve tapped into it (D) to go to the IM. That way, the valve isn't in the path of the flow; if D is blocked or if the valve is closed, air automatically routes to B. It'd also work in the stock system: under vacuum, the valve would open and create a low pressure zone at D to draw gases out that route. Very little gases would then continue on to B.

Joel, that is sexy. I can't tell in the light, but what color is it? I don't think I can pull off the lime green ones that are left

[vvenom800tt]

I think we the experts on this need to start a new thread woth just the fact and then close it, then sticky it.

[kaz02a4]

This resource here is great; it got me looking into the pcv system. It's also a great open discussion about all things pcv.

I'm already thinking of compiling together a large resource with links to everything pcv, as well as detailed descriptions of how the pieces interact with each other and other systems of the engine. Collaboration is welcome from anyone who is up to speed, but I think I'd want to keep ideas for fixes out of the thread. Facts and data belong there instead.

[CorneliusRox]

I didnt read all since my last commend, but I did skim.

Here is some info:

If you want to route your breather port out the turbo side port, that is fine. This is actually probably the best bang for buck routing.
What else do you need to do to make it work 100%?
You need to plug the tube that goes from the intake manifold to the front PCV, and that is it. At that point, the setup is bulletproof, clean, OEM looking, and will work great! Plus it should cost you like $20 to do tops.

[kaz02a4]

I didnt read all since my last commend, but I did skim.

Here is some info:

If you want to route your breather port out the turbo side port, that is fine. This is actually probably the best bang for buck routing.
What else do you need to do to make it work 100%?
You need to plug the tube that goes from the intake manifold to the front PCV, and that is it. At that point, the setup is bulletproof, clean, OEM looking, and will work great! Plus it should cost you like $20 to do tops.

Bingo. That's what I've done already, and it works great. I'll be updating my thread with consumption data after I've logged some more miles in the next couple of weeks, but so far it's promising! We were just wondering how the valving system works on the front pcv, and where it's tapped into the line. Any info on the VC and how often the baffles fail is something I've had my eye on too: it has to tie in to the failed valve cover gasket somehow. There's not a lot of info out there though.

Btw Corey, I don't think I thanked you for the write up. It's helped me through diagnostics, and I'm sure it's helped plenty of others. If I was out in CO (like the rest of AZ B7ers) a round would be on me. But you'll have to settle for internet beer credits

[Charles.waite]

Bingo. That's what I've done already, and it works great. I'll be updating my thread with consumption data after I've logged some more miles in the next couple of weeks, but so far it's promising! We were just wondering how the valving system works on the front pcv, and where it's tapped into the line. Any info on the VC and how often the baffles fail is something I've had my eye on too: it has to tie in to the failed valve cover gasket somehow. There's not a lot of info out there though.

Btw Corey, I don't think I thanked you for the write up. It's helped me through diagnostics, and I'm sure it's helped plenty of others. If I was out in CO (like the rest of AZ B7ers) a round would be on me. But you'll have to settle for internet beer credits

http://pages.ebay.com/link/?nav=item...obalID=EBAY-US

Someone buy this and dissect it! K thx.

[CorneliusRox]

Bingo. That's what I've done already, and it works great. I'll be updating my thread with consumption data after I've logged some more miles in the next couple of weeks, but so far it's promising! We were just wondering how the valving system works on the front pcv, and where it's tapped into the line. Any info on the VC and how often the baffles fail is something I've had my eye on too: it has to tie in to the failed valve cover gasket somehow. There's not a lot of info out there though.

Btw Corey, I don't think I thanked you for the write up. It's helped me through diagnostics, and I'm sure it's helped plenty of others. If I was out in CO (like the rest of AZ B7ers) a round would be on me. But you'll have to settle for internet beer credits

Thanks man! No brew needed, but if you ever head out this way, you should stop and hang out with the B7 community (and tj and jeff ;-) ).
And I'm glad it helped you!

[kaz02a4]

Thanks man! No brew needed, but if you ever head out this way, you should stop and hang out with the B7 community (and tj and jeff ;-) ).
And I'm glad it helped you!

Road trip? ROAD TRIP. I've got a few friends out there, plus the skiing is supposed to kick the east coast's ass. Tempting.

http://pages.ebay.com/link/?nav=item...obalID=EBAY-US
Someone buy this and dissect it! K thx.

Ninja edit: valve cover. Cool. I would be down to do this, seriously. Probably not by ordering it through ebay, but maybe a part out/pick-n-pull?

[CorneliusRox]

Road trip? ROAD TRIP. I've got a few friends out there, plus the skiing is supposed to kick the east coast's ass. Tempting.

Lived in Michigan for 22 years, Chicago for 2, and I agree that it is better out here. Let me know if you head out!

[jsandor91]

Bumping this. What are the plugs in the original post called went to two auto zones and couldn't find anything like it. And trying to explain what I was looking for and why was a nightmare lol.

Sent from my Nexus 4 using Tapatalk 2

[kaz02a4]

Bumping this. What are the plugs in the original post called went to two auto zones and couldn't find anything like it. And trying to explain what I was looking for and why was a nightmare lol.

Sent from my Nexus 4 using Tapatalk 2

Try a napa (that's where I got mine), but any hardware/autoparts store should have them. They're just an expandable plug; you take a wrench to one side and tighten to expand the sucker. Make sure to get the 3/4" OD plugs.

[nholzschuh]

i just installed the IE breather block off plate, and used a silicone "blanking cap" (basically a silicone bottle cap) to completely eliminate the breather tube.
will this cause any issues?
i just want to make sure im not gonan have any boost/vac issues that will cause any seals/gaskets to blow out, or lose power.

so far when i first started the car i had slightly thicker white smoke from the tail pipes (looked as if i was running a test pipe when im currently not) but that went away after a 2 block drive.
but the current "issue" im having is there is no blow off coming from my forge blow off adapter(i'm aware of the flaming that may come from me having that installed, plz refrain) im ok with the lack of a blow off sound as long as there is not a performance issue.

the pcv itself is replaced with the JHM catch can setup, currently without the oil line to oil pan (the $10 upgrade option)

*edit* i removed the block off silicone blanking cap from the "rear breather" hose port and replaced it with my old OEM breather hose, cut it in half, (retaining the check valve and the flex section) have it bent upwards at a near 90degree angle with a small "cone filter" attached. haven't driven with this but have started it... it gives the car a louder diesel sound however because of the check valve.
after driving it, ill see if it bothers me in the cabin in which case i may remove the check valve or maybe use a small piece of foam or something inside the breather to silence the check valve sound.

[Boarder4life]

So from what I'm gathering I should be ok with just putting in a block plate and routing a hose with breather filter to atmosphere for the rear pcv and leaving my 3 port 034 cc as it is on the front pcv?

[shiro1745]

So from what I'm gathering I should be ok with just putting in a block plate and routing a hose with breather filter to atmosphere for the rear pcv and leaving my 3 port 034 cc as it is on the front pcv?

Well, theoretically you would vent to air this way after having a third oil separator(034 cc) added. While it is fine, I wouldn't do it because you'll end-up breathing some of the fumes you'll put out in the engine bay. If you really want to vent to air just route a long heater hose under the car as far back as possible.

Here's how I have mine.

[Boarder4life]

Nice so no filter just a hose? Ever have any problems with it?

[CorneliusRox]

Nice so no filter just a hose? Ever have any problems with it?

I've been running no filter for a long time now with no issues. I think it works best with no filter. Fuel tanks have this style setup, and the length surprisingly keeps a ton of debris out.



Shiro, I really love you vent being in the rear, and it looks like you did a great job with it (really great). I just want to warn you (since I used to design routing for stuff like this in a previous position), if you have any belly's in this, come winter, it will fill up with moisture, will freeze, and will clog. Just make sure there isn't any! I might do this as well though, or even put a venturi in it yet.

[jrtrainor]

I've been running no filter for a long time now with no issues. I think it works best with no filter. Fuel tanks have this style setup, and the length surprisingly keeps a ton of debris out.



Shiro, I really love you vent being in the rear, and it looks like you did a great job with it (really great). I just want to warn you (since I used to design routing for stuff like this in a previous position), if you have any belly's in this, come winter, it will fill up with moisture, will freeze, and will clog. Just make sure there isn't any! I might do this as well though, or even put a venturi in it yet.

Venturi is still my end goal.

[CorneliusRox]

Venturi is still my end goal.

It would seriously take me 30min including jacking the car up to make it, but I just have no ambition to do so with my completely stock exhaust!

Honestly I would love to do it before the CAT so it would burn everything up, but I think there would be too much back pressure from the CAT and for exhaust gasses back into the oil. And I think the further down the exhaust you route it, the less of a chance you would have to get anything back in the oil. Obviously, as the air travels it cools, and compresses, which makes the flow rate drop, and the venturi less effective, but I am willing to bet it will still draw at least a slight vacuum and at very least help route the smell away. Not that the smell is bad at all (at least not on my car).

[shiro1745]

Shiro, I really love you vent being in the rear, and it looks like you did a great job with it (really great). I just want to warn you (since I used to design routing for stuff like this in a previous position), if you have any belly's in this, come winter, it will fill up with moisture, will freeze, and will clog. Just make sure there isn't any! I might do this as well though, or even put a venturi in it yet.

That is a very good point, but what exactly you think will clog, the escape hose? I see that very possible if there's moisture left into the hose before turn the engine off. I might then have to rethink the last part of the hose cause right now there's a loop at the end, it's going up an down, I see how that will keep moisture inside the hose but not sure if that's enought to clog the whole thing. Now I'm a bit confused about the belly pan you mentioned unless you ment moisture/snow will get trapped under the belly pan and that will feeze, but I'm not sure how it will clog the hose? Please explain a bit.

[clemsongt]

I think by "belly" he just meant any low points in the routing. Like a trough or valley.

[shiro1745]

I think by "belly" he just meant any low points in the routing. Like a trough or valley.

makes sense

[shiro1745]

Venturi is still my end goal.

It would seriously take me 30min including jacking the car up to make it, but I just have no ambition to do so with my completely stock exhaust!

Honestly I would love to do it before the CAT so it would burn everything up, but I think there would be too much back pressure from the CAT and for exhaust gasses back into the oil. And I think the further down the exhaust you route it, the less of a chance you would have to get anything back in the oil. Obviously, as the air travels it cools, and compresses, which makes the flow rate drop, and the venturi less effective, but I am willing to bet it will still draw at least a slight vacuum and at very least help route the smell away. Not that the smell is bad at all (at least not on my car).

aluthman is running venturi and came to the conclusion that is causing problems see post# 187

http://www.audizine.com/forum/showth...o-build/page10

[LoKisSpYdR]

I have mine routed to about 4" downstream of where the testpipe and downpipe meet. It seems to work well, with only a little bit of smell and some smoke at startup, but none any other time that I have noticed.

[shiro1745]

I have mine routed to about 4" downstream of where the testpipe and downpipe meet. It seems to work well, with only a little bit of smell and some smoke at startup, but none any other time that I have noticed.

so you routed your on the other side, interesting. any reason for doing that?

[LoKisSpYdR]

so you routed your on the other side, interesting. any reason for doing that?

It seemed to make sense from the thread on vortex and my understanding of the Bernoulli effect. It's still hot enough there to burn up most blow-by (beter there than on the valves) and it made routing easy.

[shiro1745]

It seemed to make sense from the thread on vortex and my understanding of the Bernoulli effect. It's still hot enough there to burn up most blow-by (beter there than on the valves) and it made routing easy.

Oh I see, you routed it into the exhaust. I thought you meant you just routed the hose for venting to air on the exhaust side.

[CorneliusRox]

Yeah, sorry shiro. I meant a belly as a low spot where water could collect and it is lower than the lowest high point so the water couldnt drain other than from pressure.

It's a big problem in routing air brakes on semi trucks (if you dont design for it).

[shiro1745]

Yeah, sorry shiro. I meant a belly as a low spot where water could collect and it is lower than the lowest high point so the water couldnt drain other than from pressure.

It's a big problem in routing air brakes on semi trucks (if you dont design for it).

I guess I have to spend some time under the car again and come up with a different route towards the end.

[dba4]

i am trying to learn as much about this as i can and this thread is very informative. I came from the subaru world, and the catch can is the same idea. i was looking at a solution they have and wanted to get some feed back on if it would work for our cars or if its a bad idea all together.
http://www.grimmspeed.com/catalog/pr...roducts_id=191

[CorneliusRox]

Under vacuum everything would be going the opposite direction and the check valve before the intake runners would be closed.

The catch can you posted looks solid and exactly like a catch can from one of our cars, but it just has a second port since you have a boxer engine. I mean you could run one from any car and just tee the two valve cover vents together.

Just make sure that there is a reservoir under the screw in cap shown above for oil/fuel/blowby/vapor to sit in until you empty it!

[dba4]

This assembly screws into where the oil cap is eliminating te need for a catch can. Kind of the same idea as catch cans with the drain routed back to the oil pan.

[aluthman]

aluthman is running venturi and came to the conclusion that is causing problems see post# 187

http://www.audizine.com/forum/showth...o-build/page10

I'm still trying to macgyver something up to make it work. I'm running a VTA catch can at the moment though, because I was getting oil out of the VC gasket with just the venturi. I think the check valve I have is garbage also.

[CorneliusRox]

This assembly screws into where the oil cap is eliminating te need for a catch can. Kind of the same idea as catch cans with the drain routed back to the oil pan.

Ahh, that's a pretty cool idea then.

[LoKisSpYdR]

Ahh, that's a pretty cool idea then.

x2. Freakin brilliant! Quick someone make one for VAGs and patent it.

[CorneliusRox]

ehhh, I like my vent to air still. lol

[808_implant]

Are there any PCV delete kits out there? Or should I just get a catch can set up?

[Charles.waite]

PCV delete?

Did you read this thread? Like at all?

[CorneliusRox]

Are there any PCV delete kits out there? Or should I just get a catch can set up?

PCV delete?

Did you read this thread? Like at all?

x2

This entire thread is about safely changing the stock PCV system to a bulletproof setup. Just read the first post and you should be able to gather all of your info.

[Lensch09]

It would seriously take me 30min including jacking the car up to make it, but I just have no ambition to do so with my completely stock exhaust!

Honestly I would love to do it before the CAT so it would burn everything up, but I think there would be too much back pressure from the CAT and for exhaust gasses back into the oil. And I think the further down the exhaust you route it, the less of a chance you would have to get anything back in the oil. Obviously, as the air travels it cools, and compresses, which makes the flow rate drop, and the venturi less effective, but I am willing to bet it will still draw at least a slight vacuum and at very least help route the smell away. Not that the smell is bad at all (at least not on my car).

You need to have a free flowing exhaust for this to work properly. I'm not sure id try it on a stock exhaust.

[aluthman]

You need to have a free flowing exhaust for this to work properly. I'm not sure id try it on a stock exhaust.

This. With an RAI downpipe and B&B catback, my PCV to downpipe setup was blowing oil past my VC gasket.