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View Full Version : Catch can questions.



Kaie
2011.01.25, 21:59 PM
I can't believe im the only one that ever needs questions answered! :lol:

So im going to install a catch can on my VW ABA [dont try to talk me out of it.]

However what i am confused about.... am i supposed to run emmision hose out from the block breather hole [the one that goes from the black to the crank case breater] to the catch can THEN to the crank case breather?

Heres a really ugly example but note the hose routing.
http://img.photobucket.com/albums/v643/horus1/DSC02524.jpg

Or am i suppose to unhook the intake from the PCV, route it to the catch can then route a hose from the can to the intake?

Heres another REALLY ugly example.

http://i10.photobucket.com/albums/a134/fostex437/Jetta%20-%20Oil%20Catch%20Can/SUC50081.jpg

The first option makes more sense to me. Especially since a few companies sell 'adapters' that plug into the block breather hole. But, when searching on the whoretex the few 2.0 catch can set ups i find have it working the other way. which seems stupid since the 'gunk' is still going to foul up the crankcase breather. Which is what im battling now with it set up OEM.

PS... is the adapter even necessary? I have Bulk PCV tubing running out of the block to the breather just fine [i think. it might not have a 'proper' seal?]

Adapter (http://store.blackforestindustries.com/mk3bfi20caca.html)


Heres the cans im deciding to go with...
http://www.42draftdesigns.com/categories/products/catchcans.html

I dont really want to spend 200+. But the dipstick and being able to clean the filter bits is nice.

Twelvizm
2011.01.26, 06:47 AM
If you're paying over $100 for a catch can, then you're paying too much. Go check out some non-VW specific sites and you'll see what I'm talking about. Hell, check out the ones on eBay for that matter.

Also, do yourself a favor and delete the PCV while you're at it and install a simple check valve

Here's my Eurojet catch can on my old MKV GLI on the 2.0FSI:
http://img.photobucket.com/albums/v95/twelvizm/MkV%20GLI/_MG_7967.jpg

The plate mounted to the valve cover deletes the PCV that would normally vent into the intake manifold (depositing oil vapor onto the intake runners and valves, that would eventually coke up since it's direct injected. Which doesn't pass fuel across the valves, cleaning them). The opening on the intake manifold is plugged. The block off, PCV-delete plate vents crankcase gases into the can, which then vents to air.

I hope that helps.

Twelvizm
2011.01.26, 06:51 AM
Heres a few more pics of the setup:
http://img.photobucket.com/albums/v95/twelvizm/MkV%20GLI/_MG_7981.jpg

http://img.photobucket.com/albums/v95/twelvizm/MkV%20GLI/_MG_7976.jpg

And some gratuitous whoring:
http://img.photobucket.com/albums/v95/twelvizm/MkV%20GLI/569374242_SXb9g-M.jpg

unimogken
2011.01.26, 08:47 AM
If you're paying over $100 for a catch can, then you're paying too much. Go check out some non-VW specific sites and you'll see what I'm talking about.
Exactly! Also check out some of the race car parts places like summitracing.com, jegs.com or even speedwaymotors.com.

Kaie
2011.01.26, 08:55 AM
Does the FSI's block breath like the ABA? All the VR and FSI set ups ive seen have the hoses going to/from a similar location.

Like how in the first picture it has the emission hose running from the block to the catch can. Where normally that route would go straight to the crankcase breather/pcv. Im assuming its not safe to block the block breather up as thats where those nasty gases escape.

ps where did you get that hose? I was going to use bulk emission hose.

Rabbit 16v
2011.01.26, 15:52 PM
The routing in your OP is correct. the install is terrible though. I suspect you found that pic on vortex?

Like others said, get it from Jegs or Summit or something. VW specific catch cans are for those that cant think outside the box...

Kaie
2011.01.26, 15:57 PM
So i was thinking about what you said about deleting sending it back to the intake.

What do you think of instead of blocking the hole on the intake, i attach one of those tiny filters like on your catch can? Keeping the PCV/crankcase pressure regulator, but running a can like yours off of it.

Also, is it good for the environment to expel that crankcase air into the air?

Rabbit 16v
2011.01.26, 16:12 PM
Also, is it good for the environment to expel that crankcase air into the air?

Not really. Plus if you dont have a charcoal activated cabin filter, noone will want to ride in your car cause it will smell bad.

Kaie
2011.01.26, 16:18 PM
Im planning on getting one of those cabin air assemblies and filters from GAP. I get all kinds of smells inside i hate.

So when you say it was correct in the OP is it the first picture or the second picture?

Now that ive read a bit more they both make sense actually. The first so the shit isnt fouling up the PCV and the second so the crank case crap isnt going into the intake.

Rabbit 16v
2011.01.26, 16:22 PM
for some reason I am only seeing one pic in this whole thread :banghead:

unimogken
2011.01.26, 16:29 PM
noone will want to ride in your car cause it will smell bad.
And that's a bad thing how? Hehe
No one rides with me because I smell bad...hahaha

Kaie
2011.01.26, 16:30 PM
oh weird..

Heres option 1:
http://img.photobucket.com/albums/v643/horus1/DSC02524.jpg

option 2:
http://i10.photobucket.com/albums/a134/fostex437/Jetta%20-%20Oil%20Catch%20Can/SUC50081.jpg


Yeah i found theres TERRIBLE setups on the vortex, i was appalled the people were showing them off. McGyver would've done a better job with gum and dirt.

joel
2011.01.26, 16:41 PM
Yeah i found theres TERRIBLE setups on the vortex, i was appalled the people were showing them off. McGyver would've done a better job with gum and dirt.

what!? the vortex knows all!

Rabbit 16v
2011.01.26, 16:41 PM
Jesus, thats terrible. anyway, does option 1 have the breather valve connected to the intake? if so, dont do it that way.

Kaie
2011.01.26, 16:54 PM
Yeah, i believe option 1 has it going from block-to-> can-to-> PCV w/ the PCV still hooked to intake.

Option two has it going Block-to-> PCV w/ PCV-to-> can-to-> intake

So go with option two?

Do you suppose doing both is over kill? Catching from the block to PCV and PCV to Intake?

Twelvizm
2011.01.26, 17:07 PM
Not really. Plus if you dont have a charcoal activated cabin filter, noone will want to ride in your car cause it will smell bad.

I eventually pulled off the filter, put another fitting on to another hose and routed it to the ground. No more cabin smell. Although you'll leave some drops on the ground here and there.



Also, is it good for the environment to expel that crankcase air into the air?
No more so than what's coming out of your tailpipe.

Kaie
2011.01.27, 20:36 PM
Twelvizm where did you get that hose? it looks nicer than just straight emission hose.

Rabbit 16v
2011.01.27, 21:06 PM
No more so than what's coming out of your tailpipe.

No offense, but actually yes. Moreso than what comes out of the tailpipe if you look at the car as a whole when it is running. Venting crankcase fumes to atmosphere is polluting. Its not major, but its still polluting. Plus it smells hella bad. Take into consideration that you are referring to a MKV that has a charcoal activated cabin filter and you felt the need to relocate it because of the fumes. Now take into consideration the OP who has NO cabin filter.... Smells batman.

Kaie
2011.01.27, 21:12 PM
yeah i was thinking the fumes were pushed back through the system to be burned off. In turn reducing emissions.

So you think option two is the better option? How do you feel about catchcanning both of those hoses? The one to the valve and the one to the intake from the valve.