1. This site uses cookies. By continuing to use this site, you are agreeing to our use of cookies. Learn More.

Reason for deleting pcv valve and pipework with catch can.

Discussion in 'A3/S3 Forum (8L Chassis)' started by bengal, Oct 28, 2010.

  1. bengal

    bengal Member

    Joined:
    Sep 25, 2010
    Messages:
    537
    Likes Received:
    1
    Hi all just a quick question im going to put a catch can on my car and iv seen that others have removed the pcv system. What is the reason for this is a catch can a good vacuum source so you dont need the source from the inlet manifold or is it just a case of minimising the chance of boost leaks? Also do you remove the breather valve on the tip or just leave it in ? Its a 1.8 T AGU thanks
     
  2. Google AdSense Guest Advertisement



    to hide this advert.
  3. s3dave

    s3dave TFSI Hybrid
    Supporter

    Joined:
    Nov 11, 2009
    Messages:
    10,120
    Likes Received:
    732
    To catch oil.....:cool:
    And to stop all the **** clogging your engine, and to minimise boost leaks as there is less of it...
     
    #2 s3dave, Oct 28, 2010
    Last edited: Oct 28, 2010
  4. <tuffty/>

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

    Joined:
    Sep 14, 2008
    Messages:
    17,518
    Likes Received:
    2,105
    Mostly its to stop oil from diluting the fuel as this reduces the octane rating and if excessive will potentially bring on detonation (although the ECU will try and combat it with pulling timing)...

    <tuffty/>
     
  5. bengal

    bengal Member

    Joined:
    Sep 25, 2010
    Messages:
    537
    Likes Received:
    1
    Hmm i wasnt very clear with the question was i lol. I didnt mean whats the catch can for i know that i meant why delete the pcv valve but i suppose if you left it in you would still get oil going into the inlet manifold so il get rid of it. Thanks for the replies though. Oh and i didnt know that excessive oil in the system could cause detonation so iv learnt something there.
     
  6. Prawn

    Prawn My other car is a MINI!!!!

    Joined:
    Dec 8, 2006
    Messages:
    10,315
    Likes Received:
    1,920
    Main reason for getting rid of the pcv valve is to minimise the chance of leaks. The pcv pipe work under the inlet is notorious for boost/vac leaks, and the vacuum drawn breathing on idle isn't really needed, by fitting a catch can you're just letting the engine breath naturally. You can leave the pcv system in place and still fit a catch tank, and it's also possible to remove the pcv part of the breather system without fitting a catch tank, although it's best to do both
     
  7. finesse

    finesse Active Member
    VCDS Map User

    Joined:
    Aug 15, 2006
    Messages:
    2,811
    Likes Received:
    10
    need to do this
     
  8. finesse

    finesse Active Member
    VCDS Map User

    Joined:
    Aug 15, 2006
    Messages:
    2,811
    Likes Received:
    10
    pcv delete guide anyone
     
  9. Duktor

    Duktor Member

    Joined:
    Oct 3, 2010
    Messages:
    282
    Likes Received:
    1
    yeah second that ,do i have this amk 2001 facelift
     
  10. The Doctor

    The Doctor Well-Known Member

    Joined:
    Jul 25, 2009
    Messages:
    1,339
    Likes Received:
    146
  11. Nilz

    Nilz Defo worth the wait :)

    Joined:
    Apr 9, 2006
    Messages:
    10,676
    Likes Received:
    595
    Hmm, considering I have a few leaks that need sorting under the inlet, what is the total cost for this??

    Doc, let me know how you get on with yours mate :)
     
  12. finesse

    finesse Active Member
    VCDS Map User

    Joined:
    Aug 15, 2006
    Messages:
    2,811
    Likes Received:
    10
    Can the PCV be deleted without adding a catch tank
     
  13. Nilz

    Nilz Defo worth the wait :)

    Joined:
    Apr 9, 2006
    Messages:
    10,676
    Likes Received:
    595
    I believe so, but its supposed to be better to do both together.
     
  14. finesse

    finesse Active Member
    VCDS Map User

    Joined:
    Aug 15, 2006
    Messages:
    2,811
    Likes Received:
    10
    ahh cool
     
  15. Duktor

    Duktor Member

    Joined:
    Oct 3, 2010
    Messages:
    282
    Likes Received:
    1
    great info Doctor , didnt see any mention of the amk unit though so presumably this mod applies to most or all the vag audi 5v turbos ?
     
  16. Nilz

    Nilz Defo worth the wait :)

    Joined:
    Apr 9, 2006
    Messages:
    10,676
    Likes Received:
    595
    Duktor, I believe its the same across teh 1.8T range.
     
  17. 1animal1

    1animal1 The Clar!! it mouves!!!
    VCDS Map User

    Joined:
    Dec 27, 2007
    Messages:
    9,979
    Likes Received:
    35
    its pretty much the same idea.....different engine codes do throw up different problems, ie an AUM engine will have a bit more complication to it than an S3 IMO.....
     
  18. The Doctor

    The Doctor Well-Known Member

    Joined:
    Jul 25, 2009
    Messages:
    1,339
    Likes Received:
    146
    Yeah, not sure re any difference between engine codes, but send a PM to OllieH who started the PCV Simplification thread above and he may be able to advise you.

    Nilz18t - I'll update you next week (hopefully with +ve news...). Can't remember the total cost but scan though the pages of the link above & you'll see how much the catch cans, pipework and bits & pieces were.
     

Share This Page