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    Thread: Audi 3A block, ABA head. Compression ratio?

    1. 07-24-2012 12:06 AM #1
      I'm putting an ABA head on a 3A block.
      Anyone know what the resulting compression ratio will be?
      If it's high like 10 or 11:1, what is best way to get it down?
      Stack MLS gaskets or use a head spacer?
      If just gaskets, how many?

    2. Member ps2375's Avatar
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      07-24-2012 01:05 AM #2
      I don't know what the 3A head looks like, but if it is anything like the other 8V counterflow heads, the CR should be near the same as stock.
      Tradition is the art of making the same mistake repeatedly, on purpose.

    3. Member Prof315's Avatar
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      07-25-2012 09:37 AM #3
      Quote Originally Posted by mk1vw View Post
      I'm putting an ABA head on a 3A block.
      Anyone know what the resulting compression ratio will be?
      If it's high like 10 or 11:1, what is best way to get it down?
      Stack MLS gaskets or use a head spacer?
      If just gaskets, how many?
      What's stock compression on a 3A? how many cc's is the stock 3A head?
      The Professor
      Melbourne, FL
      92 Corrado OBD2 ABA-T (BW EFR 6258) Powered by MS3Pro
      Linfert Performance: The Megasquirt guy in central Florida Like my Facebook page....
      Sandy Linfert 11/4/1991 - 5/13/2013

    4. 07-25-2012 11:49 AM #4
      comp is 10.5:1 according to this:
      http://www.not2fast.com/vw/stuff/vw_engines.shtml
      can't find info on 3A chamber size.

      i don't have the equipment or experience to cc the chamber, piston dish and quench area of my combo.
      guess with just keep looking.

    5. Member Prof315's Avatar
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      07-25-2012 01:51 PM #5
      Quote Originally Posted by mk1vw View Post
      comp is 10.5:1 according to this:
      http://www.not2fast.com/vw/stuff/vw_engines.shtml
      can't find info on 3A chamber size.

      i don't have the equipment or experience to cc the chamber, piston dish and quench area of my combo.
      guess with just keep looking.
      If the info in the link is correct a 3A with an ABA head will wind up about 10 to 1 maybe a touch lower.
      The Professor
      Melbourne, FL
      92 Corrado OBD2 ABA-T (BW EFR 6258) Powered by MS3Pro
      Linfert Performance: The Megasquirt guy in central Florida Like my Facebook page....
      Sandy Linfert 11/4/1991 - 5/13/2013

    6. 07-25-2012 04:59 PM #6
      so then with one of these
      http://www.bahnbrenner.com/vw_audi/p...ead_Gasket_ABA

      I should be good for 15psi intercooled and megasquirted with 30lb injectors?

    7. Member Prof315's Avatar
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      07-25-2012 06:51 PM #7
      Quote Originally Posted by mk1vw View Post
      so then with one of these
      http://www.bahnbrenner.com/vw_audi/p...ead_Gasket_ABA

      I should be good for 15psi intercooled and megasquirted with 30lb injectors?
      Yeah that will work. That set up is good for ~ 225-250whp then you run out of injector.
      The Professor
      Melbourne, FL
      92 Corrado OBD2 ABA-T (BW EFR 6258) Powered by MS3Pro
      Linfert Performance: The Megasquirt guy in central Florida Like my Facebook page....
      Sandy Linfert 11/4/1991 - 5/13/2013

    8. 07-25-2012 11:51 PM #8
      that's cool.
      this will be plenty in a MK2 Golf.
      pushing the limits of the 020 at that point anyway.

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