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

Westy Apr 20, 2011

  1. Siondc

    Siondc Learner!! Ming Blue S3 AMK

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    Cam cover breather and oil filter housing breather meet at t-joint, go in to catch can. Then from the catch can into hockey puck into TIP.
     
    Last edited: Dec 4, 2017
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  3. Siondc

    Siondc Learner!! Ming Blue S3 AMK

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    There’s water and lots of yellow funk building up in the catch can
     
  4. Erikn89nl

    Erikn89nl Well-Known Member

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    Which size hoses have you used? What size are the in- and outlets on the can?
     
  5. Siondc

    Siondc Learner!! Ming Blue S3 AMK

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    Everything’s 19mm
     
  6. hydro s3

    hydro s3 S3 amk Team Ming Blue Audi S3

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    Ill have to have a look in mine and see what's in it. I haven't emptied it since it was put in. I have just been looking in the plastic veiwing tube and it's empty.
     
  7. Siondc

    Siondc Learner!! Ming Blue S3 AMK

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    I’ve been emptying mine once a week since installing it, only ever half full but mostly water with some yellow gunk. Mines not baffled but has some filtration on the outlet of the inside of the catch can.
     
  8. Stuart B

    Stuart B Well-Known Member

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    that's what I get out of mine its just yellow emulsified gloop and water - I cannot trust the clear tube for a level, as it gets blocked up straight away.
     
  9. hydro s3

    hydro s3 S3 amk Team Ming Blue Audi S3

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    Sounds like ill need to get mine of and see whats in mine. Hopefully not what use two have been getting in urs.
    Is that not a bad sign if its filling up that quick and with the yellow gunk and watery stuff?
     
  10. Stuart B

    Stuart B Well-Known Member

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    probably the case for me - although early morning condensation will always create gloop, and water. I think that's the point of the catch can. although Prawn's literally filled with oil. I have only emptied mine once in 1 year.
     
  11. Siondc

    Siondc Learner!! Ming Blue S3 AMK

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    I’ve been reading and it’s pretty normal, the water comes from the blow-by when the bang happens water is produced and this condenses in the catch can. Made worst in the cold weather and if you make short journeys.
     
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  13. Siondc

    Siondc Learner!! Ming Blue S3 AMK

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    I hope it’s not filling up too quick, sense says that’s a sign of worn piston rings (excessive blow-by). I’ve routed mine back into the TIP, I don’t know about yours, but it could be sucking it through and filling it up quicker.
     
  14. hydro s3

    hydro s3 S3 amk Team Ming Blue Audi S3

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    Good to know. Ill keep an eye on it especially with the colder mornings.
     
  15. hydro s3

    hydro s3 S3 amk Team Ming Blue Audi S3

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    I vented to atmosphere
     
  16. S3Powerxz

    S3Powerxz Member

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    Would you tel me any good catch can to use? I read that i need baffled one, but i can't find one with 19mm inlet/outlet.
     
  17. SHUk

    SHUk Once Bitten Forever Smitten =]

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    I attached the vent from the oil can straight to the crank case breather and capped the intake. This resulted in the car producing a huge cloud out the exhaust... think the rings are shot =[]
     
  18. SHUk

    SHUk Once Bitten Forever Smitten =]

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  19. Siondc

    Siondc Learner!! Ming Blue S3 AMK

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    Could be why your not filling up so much........ I hope
     
  20. Siondc

    Siondc Learner!! Ming Blue S3 AMK

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    I’ve got the one SHUk has suggested above. Good solid construction, very well made. But you have to check it at least once a week as there’s no way to tell when it’s full.
     
  21. Stuart B

    Stuart B Well-Known Member

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    I got a chrome one fits nicely but not baffled so pointless and the only way of emptying it without removing it is by removing the gauge connectors and teasing the gloop out. all show and no go...
     
  22. Siondc

    Siondc Learner!! Ming Blue S3 AMK

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    The one I have is so easy to empty as it’s like a jam jar. It’s mounted with a bracket on the lid and the jar just unscrews from the lid, simples. I’ve mounted mine on the battery holder so easier to access than at the back of the engine bay. Only downside is there’s no way knowing how full it is other than opening it. And there’s no real baffle inside, just a semi circular filter, not the best but seems to do the job. I may put some wire wool in to see if that helps.
     
  23. Stuart B

    Stuart B Well-Known Member

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    yeah this is mine but it is a totally sealed unit (utter junk)

    catchcan.jpg
     
  24. Siondc

    Siondc Learner!! Ming Blue S3 AMK

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    That looks like a PITA to empty. But nice mounting spot. I would recommend the one I have, in the eBay link above. I’m worried about how often I have to empty mine and the smoke coming from the exhaust when in boost. I’m not sure the 2 are linked but I’m sure it only started happening after I fitted the catch can.
     
  25. Stuart B

    Stuart B Well-Known Member

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    I know some people added a valve to try and keep negative pressure in the block and also I am unsure about my puck being straight in the TIP. but my engine puffs out of both the breathers and has done for about a year now (3000 miles) I don't think this was caused by the catch can and was probably from 7000 rpm :D and a **** ECU from eBay which was maybe knocking? - everytime I put my foot down I visualise Ian's rods :)

    benders.png
     
  26. Siondc

    Siondc Learner!! Ming Blue S3 AMK

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    What power did he duck them up at? Extra long stroke ftw ha!!
    I’m using the puck , what do mean straight in the TIP? I’ve connected my puck how it was oem and I get gunk in the pipes coming from both breathers.
     
  27. Stuart B

    Stuart B Well-Known Member

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    I just pushed the puck into the TIP connector instead of it being located at the top of the engine and horizontal, so I am unsure if it is working efficiently.
     
  28. Siondc

    Siondc Learner!! Ming Blue S3 AMK

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    The pucks just a spring and diaphragm operated by the vacuum from the TIP on boost, I wouldn’t think it’s position and orientation would efffect it efficiency. As long as it’s routed with the bottom going into TIP.
     
  29. Stuart B

    Stuart B Well-Known Member

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    Thanks, I expect it is fine then
     
  30. willhutson74

    willhutson74 Member

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    please can someone take a pic 9f their 1.8 turbo agu and show me where catch can goes and where pipes run to .. using thumbnails on here as i don't have photobucket )can't afford it) or any 3rd party way of seeing pics

    my engine bay is pictured below .. seems different to everyone else's on here
     

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  31. <tuffty/>

    <tuffty/> Badger 5 Edition...Its all about the flow... Staff Member Moderator Audi S3

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    I have edited as many of the pics as I could on the first page... you should be able to see them now... (although for how long depends on how quickly photobucket catch on)

    Your engine bay is exactly the same as any other AGU engine bay... its just that everyone else's has been modified so look different

    <tuffty/>
     
  32. willhutson74

    willhutson74 Member

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    oh!! lol .. all the pics 8 see have a weirdly small cover and hoses etc on top of engine not off to side like mine etc .. my bad

    and thanks man .. you're a f...g legend
     
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  34. <tuffty/>

    <tuffty/> Badger 5 Edition...Its all about the flow... Staff Member Moderator Audi S3

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    I suspect you are referring to an S3 then... they are a slightly different layout to the A3

    <tuffty/>
     
  35. willhutson74

    willhutson74 Member

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    yeah I take it that's what is in pictures as i can't work out where some of the hoses go to or come from on your pics .. cos they're not in same position as mine .. plus I don't have that silicone hose replacement you guys do .. mines factory pos pipe
     
  36. <tuffty/>

    <tuffty/> Badger 5 Edition...Its all about the flow... Staff Member Moderator Audi S3

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    basic principles of the PCV delete is the same across all 1.8t's... the main difference is the pipework on the inlet...

    <tuffty/>
     
  37. willhutson74

    willhutson74 Member

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    yeah .. i don't have that splitter bit on passenger side
     
  38. SHUk

    SHUk Once Bitten Forever Smitten =]

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    You need 2-3m of 19mm oil hose, one pipe comes up from oil breather up towards crank case breather with a t piece on connect the abov two and send theirs to catch can, take other side of catch can up to inlet hockey puck. Simples =[]
     
  39. willhutson74

    willhutson74 Member

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    totally lost me .. I have 4 pipes to know what to do with and then the hockey puck
     
  40. willhutson74

    willhutson74 Member

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    red is pcv pipes setup
    blue is electrical wire attached to what I presume is charcoal canister (assume because every time i go onto internet and Google 1999 agu 8l 1.8t images of motor i get the same S3 pics you guys have on here !!!!
     

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  41. Rainbird

    Rainbird Active Member

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    Edit; You posted pics while I was replying, nice one.

    Most of the lines you've highlighted aren't really the PCV system which folk fit the can to.

    There's a breather from the crankcase (under the inlet mani), and another from the valve cover (RHS of head once you remove cover). Pull those out, route into a can then on to the TIP from there. Remove any redundant hoses, cap off where they join other systems (brake booster, EVAP if not removing it) and you're done.
     
  42. willhutson74

    willhutson74 Member

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    I don't have any pipes come from head only the ones shown
     
  43. willhutson74

    willhutson74 Member

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    what's evap
     

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