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

AEB Exhaust Port Size

Discussion in 'A3/S3 Forum (8L Chassis)' started by Barks, Jul 31, 2013.

  1. Barks
    Offline

    Barks Member

    Joined:
    Aug 23, 2009
    Messages:
    335
    Likes Received:
    1
    [Jul 31, 2013]
    Has anyone got a AEB head on the bench that they can measure the true exhaust port size?? (Mine is fitted and I want to do some porting port on a 'Chinafold' before fitting)

    Thanks

    Dave
    #1
  2. Ads

    Ads

    [Sep 16, 2014]

  3. superkarl
    Offline

    superkarl MAN OF STEEL

    Joined:
    Mar 28, 2010
    Messages:
    7,614
    Likes Received:
    1,102
    [Jul 31, 2013]
    I think its 38mm.

    You dont want the manifold matched to the head, you need the head to be a tad smaller than the manifold to prevent/reduce exhaust gas reversion.
    Id take the manifold to gasket size if i were you. I know for a fact the gasket is bigger than the aeb exhaust ports.
    #2
  4. Jason.s
    Offline

    Jason.s Active Member

    Joined:
    May 12, 2010
    Messages:
    2,879
    Likes Received:
    348
    [Jul 31, 2013]
    36mm and 33mm for small port.
    #3
  5. Barks
    Offline

    Barks Member

    Joined:
    Aug 23, 2009
    Messages:
    335
    Likes Received:
    1
    [Jul 31, 2013]
    36mm or 38mm, I have got a gasket so I can certainly measure that size.

    Thanks
    #4
  6. Barks
    Offline

    Barks Member

    Joined:
    Aug 23, 2009
    Messages:
    335
    Likes Received:
    1
    [Jul 31, 2013]
    BTW Exhaust gasket is 41mm
    #5
  7. JimS3
    Offline

    JimS3 Active Member

    Joined:
    Mar 17, 2013
    Messages:
    699
    Likes Received:
    66
    [Jul 31, 2013]
    Yup, just measured my AEB head, the exhaust ports are 36mm.

    The AEB exhaust manifold measures 38.5 though, not that it's any use on a transverse car.
    #6
  8. superkarl
    Offline

    superkarl MAN OF STEEL

    Joined:
    Mar 28, 2010
    Messages:
    7,614
    Likes Received:
    1,102
    [Jul 31, 2013]
    If you leaving the head at 36 then its prob only worth having the mani 1 or 2 mm bigger.
    #7
  9. Barks
    Offline

    Barks Member

    Joined:
    Aug 23, 2009
    Messages:
    335
    Likes Received:
    1
    [Aug 1, 2013]
    Perfect guys, just the information I require, a slight step head to manifold then, thanks very much for you time.
    #8

Share This Page