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Guide - How to fit a catch can and simplify the PCV system

Discussion in 'A3/S3 Forum (8L Chassis)' started by Westy, Apr 20, 2011.

  1. Sam_
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    Sam_ Down under

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    #41
  2. rhubarb4
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    rhubarb4 Certified Jardo Slayer

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    how long have they said for delivery, guessing a week or so from where it is
    #42
  3. Sam_
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    Sam_ Down under

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    Yeh it'll be less you you guys in the UK. Everything takes a while to get here it seems. Great weather, women and BBQs but not much else :)
    #43
  4. steviet
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    steviet Member

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    Sorry if i sound stupid,but what benifits do you get by doing this breather system please?..i dont have S3 just a A3
    #44
  5. Westy
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    Westy Double Dark Side! Diesel & 8P

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    This was taken from uk-mkvs.net:

    No oily vapour should re-enter the intake. It'll be caught in the catch can. This should:

    - Keep boost pipes free from recirculated oil vapour
    - Octane of the fuel shouldn't be reduced (oil vapour reduces octane apparently)
    - No need to clean throttle body again
    - No boost leaks from the stock VW pipework under the manifold. Remember, anything in the inlet is either boost or vacuum. If a vac pipe connected to the manifold has a split, it'll leak both under vacuum and boost conditions and the ECU will need to compensate. If enough compensation has to occur that the ECU thinks it's out of tolerance, you'll see a CEL on the dash
    #45
  6. Westy
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    Westy Double Dark Side! Diesel & 8P

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    Just been out to empty my can and i've noticed since venting to atmosphere that the amount of condesation in the can has almost vanished.

    I've been checking the can twice a week and it's a lot better than it was when venting to TIP.
    #46
  7. steviet
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    steviet Member

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    Is this the same set up for the A3 1.8T?..
    #47
  8. Westy
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    Westy Double Dark Side! Diesel & 8P

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    It sure is bud.
    #48
  9. Westy
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    Westy Double Dark Side! Diesel & 8P

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    I've now started to notice the ocaisional wiff from the catch can filter. If I empty the can every couple of days there is not problem but if left for a week or so, the smell from the contents of the catch can is more noticable.

    I'll probably re-route the filter lower into the bay and see if it's any better.

    On a side note has anyone else noticed their plastic 90 degree 19mm bends starting to split in the middle? I binned one of mine when I vented to atmos but the other one was looking a bit fragile.

    I looked into alloy replacements but they are quite pricey!

    3/4" 19mm OD 90 Degree Elbow Aluminium T6 ALLOY PIPE | eBay UK
    #49
  10. Sam_
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    Sam_ Down under

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    That's crazy money! It cost less for my -12AN anodised fitting!
    #50
  11. Westy
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    Westy Double Dark Side! Diesel & 8P

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    Yeah I know. I think i'll just order up another plastic one and a spare just incase.
    #51
  12. s3dave
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    s3dave TFSI Hybrid

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    I could do stainless ones for half that...
    #52
  13. Westy
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    Westy Double Dark Side! Diesel & 8P

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    I'm glad you spotted this post because I was going to PM you ;)

    If they can be done to similar measurements as these plastic ones that would be good. I'm sure you'd need a few of us to be interested before it makes it worth while for you though?

    19mm Plastic 90 Degree Elbow Hose Joiner L | eBay UK
    #53
  14. s3dave
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    s3dave TFSI Hybrid

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    I can do them for £7 each free delivery....
    #54
  15. s3dave
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    s3dave TFSI Hybrid

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    There you go Neil...hot of the press...lol... 2 x enroute

    [​IMG]
    Uploaded with ImageShack.us
    #55
  16. Westy
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    Westy Double Dark Side! Diesel & 8P

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    They look sweet Dave. Cracking service as always ;)
    #56
  17. rhubarb4
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    rhubarb4 Certified Jardo Slayer

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    Shocking price :faint:
    #57
  18. rhubarb4
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    rhubarb4 Certified Jardo Slayer

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    What about the T piece Dave
    #58
  19. finesse
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    finesse Active Member

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    westy, fancy doing mine? renomination of course :whip:
    #59
  20. s3dave
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    s3dave TFSI Hybrid

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    if enough peeps want them ill do a good price...
    #60
    S3Lol likes this.
  21. Westy
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    Westy Double Dark Side! Diesel & 8P

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    The T piece seems to be holding up a lot better that the 90 degree bends on mine. Thing the 90 degree bends were cheap **** intended for use on a fish tank or something!
    #61
  22. Westy
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    Westy Double Dark Side! Diesel & 8P

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    90 degree bends turned up today Dave, thanks again, unbelievable service. One minute we were talking about it and the next minute they've dropped through my door :applaus:

    Anyway just popped out to the car and took a few pics:

    [​IMG]

    Bit of oil where I removed the breather:

    [​IMG]

    Cobbled together this:

    [​IMG]

    Not to sure where to vent the thing now! If I go straight down it'll get in the way of stuff, and the smell will probably just rise :uhm:

    Anyone got any ideas?
    #62
  23. s3dave
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    s3dave TFSI Hybrid

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    :hi:

    I was thinking of getting mine down by the passenger smic area near the wing grills under the arch
    #63
  24. Westy
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    Westy Double Dark Side! Diesel & 8P

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    I may wait till I have ripped out my passenger smic when I get my fmic and run it down there. Good plan.
    #64
  25. S3Lol
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    S3Lol Member

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    ok, so my shopping list is...

    Catch can
    3 meters 19mm oil grade silicon hose (just in case I make a mistake somewhere)
    1 x metal t piece (S3dave)
    2 x metal 90 degree bends (S3dave)

    What I dont get is you also have 13mm hose for your brake servo, and that 1 way valve. So do I need:

    an additional 2 meters of 13mm oil grade silicon hose
    one way valve (13mm inlet/outlet)

    ???

    How many points am I capping off and are they all 19mm (going to order proper caps, possibly S3dave if he can do them as well).

    Just want to get everything before I attempt this. Also, if you have a link of where to buy that valve, it would be useful.

    Thanks
    #65
  26. Westy
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    Westy Double Dark Side! Diesel & 8P

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    I got a 1 way valve from ebay, search for "boat non return valve" I think.

    As for blocking things up, you will need a bung for the middle nipple under the inlet mani (cant remember size) maybe 8mm. and you will need a bung for the brake servo if you re-use the 1 way valve. If you buy a new valve you will only need the mani bung.
    #66
  27. Sam_
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    Sam_ Down under

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    I bought a one way valve from the local part factors and used the original hose...

    [​IMG]
    #67
  28. Syvo
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    Syvo IF IN DOUBT GO FLAT OUT

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    i need to redo mine the clear hose is **** i got so gonna get solme oil grade silicone and a better catch can as westy will know what my catch can looks like lol
    #68
  29. Westy
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    Westy Double Dark Side! Diesel & 8P

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    I didn't think the clear hose would last long either lol.

    I'll be re-routing the breater this weekend once my airbos is out the way. Fitting a Jetex cone at Bill's tomorrow then I'll route the breather into the wing through the old air duct hole.

    I start to feel sick from the oil fumes in traffic :(
    #69
  30. S3Lol
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    S3Lol Member

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    theres nothing wrong with that servo hose so will probably just go with the valve and caps for the moment. Got too much to do at the moment so save that for a later date.

    Do i need a little bit of 8mm pipe as well then for the cap to go in or can I reuse whats already there for that?

    Cheers
    #70
  31. Syvo
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    Syvo IF IN DOUBT GO FLAT OUT

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    will make a head shield for the air filter and fit the catch can to that as got no room at mo to fit the can in lol.

    the clear hose looked pretty for a week so so till the oil started passing through and making it look brown lol
    #71
  32. Syvo
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    Syvo IF IN DOUBT GO FLAT OUT

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    i reused and put a big blot in it with a jubilee clip to make sure was sealed
    #72
  33. Westy
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    Westy Double Dark Side! Diesel & 8P

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    I reused what was there and stuck a bolt in it and jubileed it up. Pikey mod FTW ;)
    #73
  34. Sam_
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    Sam_ Down under

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    I managed to squeeze on some 5mm silicon and a bolt in the other end...
    #74
  35. S3Lol
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    S3Lol Member

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    also, my 19mm is going to be marine rubber hose. Hope thats alright!
    #75
  36. Westy
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    Westy Double Dark Side! Diesel & 8P

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    It needs to be oil grade because normal rubber/silicone will break down quicker from the oil fumes.
    #76
  37. S3Lol
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    S3Lol Member

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    #77
  38. Sam_
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    Sam_ Down under

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    If its like mine (also marine), it'll be almost impossible to bend. I've just bought proper goodridge AN12 push fit hosing (in black) to match my fittings.
    #78
  39. S3Lol
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    S3Lol Member

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    can someone let me know if the rubber pipe looks good for this application?
    #79
  40. Syvo
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    Syvo IF IN DOUBT GO FLAT OUT

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    yeh that looks fine for the catch can i recomend ap ive bought a few things from them the plastic joiners are also good quality or get the metal ones from s3 dave.
    #80

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