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AEB Exhaust Port Size

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

  1. Barks

    Barks Member

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    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
     
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  3. superkarl

    superkarl MAN OF STEEL

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    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.
     
  4. Jason.s

    Jason.s Active Member

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    36mm and 33mm for small port.
     
  5. Barks

    Barks Member

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    36mm or 38mm, I have got a gasket so I can certainly measure that size.

    Thanks
     
  6. Barks

    Barks Member

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    BTW Exhaust gasket is 41mm
     
  7. JimS3

    JimS3 Active Member

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    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.
     
  8. superkarl

    superkarl MAN OF STEEL

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    If you leaving the head at 36 then its prob only worth having the mani 1 or 2 mm bigger.
     
  9. Barks

    Barks Member

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    Perfect guys, just the information I require, a slight step head to manifold then, thanks very much for you time.
     

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