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    Thread: Starting on my 16vT/ABA

    1. 10-10-2012 09:57 AM #26
      i checked mine by putting the head on the block with a hea gasket but no bolts and it hit with at least 1/8 inch gap between the head and block when the piston was at the top.a head spacer will help.

    2. 10-10-2012 09:58 AM #27
      ive decided to use 9a pistons and just switch the wrist pin bushings in the aba rods for 16v ones.

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      10-10-2012 11:35 AM #28
      i think a head spacer with aba pistons will be to low compression. i went with je pistons from integrated

    4. Member chilledOUTmk1's Avatar
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      10-10-2012 03:22 PM #29
      Quote Originally Posted by slorydgti View Post
      i checked mine by putting the head on the block with a hea gasket but no bolts and it hit with at least 1/8 inch gap between the head and block when the piston was at the top.a head spacer will help.
      Did you have everything timed? I never heard anyone needing to make any changes to the ABA pistons to clear the valves..

    5. Member red16vdub's Avatar
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      10-10-2012 03:47 PM #30
      X2. ???

      bajan 4g
      • ANYTHING UNATEMPTED REMAINS IMPOSSIBLE

      scIROCco 16v /A6 quattro sport / Mk4 TDI JSW 5spd

    6. 10-10-2012 04:46 PM #31
      this is for a 16v head

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      10-10-2012 04:48 PM #32
      are you using an adjustable cam gear?

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      10-10-2012 04:49 PM #33

    9. Member Moshua's Avatar
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      10-10-2012 11:00 PM #34
      Quote Originally Posted by scoomscoom View Post
      are you using an adjustable cam gear?
      I'm not sure if i need one yet. i have the 16v cam gear that was on the head and a modified aba crank pulley so things should line up alright but we shall see if i can get it timed correctly.

      Also I NEED some verification whether i will need to make valve reliefs in the early obd1 ABA pistons?

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      10-11-2012 07:16 AM #35
      You should for a peace of mind but some people just slap them on. I would highly recomend reliefs if your boosting.

    11. 10-11-2012 07:52 AM #36
      the 16v intake valves open well below the botom of the head they will hit the aba pistons if they are not modified.ive already checked it out on my engine.i decided on 9a pistons instead.

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      10-11-2012 09:45 AM #37
      So when using the 9A pistons in the ABA bottom end, there is no clearance issues with the valves?

    13. Member Moshua's Avatar
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      10-11-2012 11:38 AM #38
      Quote Originally Posted by slorydgti View Post
      the 16v intake valves open well below the botom of the head they will hit the aba pistons if they are not modified.ive already checked it out on my engine.i decided on 9a pistons instead.
      Do you have a suggestion on what valves to use or perhaps point me in the direction of a thread that gives more info

      Sent from my HTC One X using Tapatalk 2

    14. 10-11-2012 02:32 PM #39
      i would search this site and find out what people did and then find a machine shop that will do it.im no expert but if the intake valves open when the piston hits tdc there done.heads done.the 16v pistons are recessed for a reason.it shouldnt cost much to get done.you just need to figure out what to do.

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      10-11-2012 03:25 PM #40
      Quote Originally Posted by slorydgti View Post
      i would search this site and find out what people did and then find a machine shop that will do it.im no expert but if the intake valves open when the piston hits tdc there done.heads done.the 16v pistons are recessed for a reason.it shouldnt cost much to get done.you just need to figure out what to do.
      Yeah I know what you are saying though I'll try a dry fit and see if and how much I'll have to take off of them. I thought I had researched enough but I'll look into it more to see what options I have on valves too

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      10-12-2012 08:42 PM #41
      From what I have gathered, when timed properly, there is no contact between valves and pistons when using stock 9A head and stock ABA bottom end. Guess Ill just have to bolt **** up and see.

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      10-13-2012 10:02 AM #42
      Quote Originally Posted by chilledOUTmk1 View Post
      From what I have gathered, when timed properly, there is no contact between valves and pistons when using stock 9A head and stock ABA bottom end. Guess Ill just have to bolt **** up and see.

      That's what I thought too.

      Sent from my HTC One X using Tapatalk 2

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      12-03-2012 01:54 PM #43
      I ran OBD2 ABA pistons in mine for a while, and decided I wanted a higher CR, so I swapped them for stock 9a pistons.

      I had contact marks on the pistons from the valves. Didn't bend any, but definitly hit. I think the head had been shaved prior to my getting it, so that may have played into it. I bolted it together with some clay on the pistons, then spun the crank. It looked like it was going to work, but must have gotten closer as it heated up.

      Long story short, it may be well worth the time to cut valve reliefs in the ABA pistons (~8.5:1 CR) or use 9a pistons (~9.2:1 CR).

    19. Member Moshua's Avatar
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      12-04-2012 04:19 AM #44
      Quote Originally Posted by SwiftMKIII View Post
      I ran OBD2 ABA pistons in mine for a while, and decided I wanted a higher CR, so I swapped them for stock 9a pistons.

      I had contact marks on the pistons from the valves. Didn't bend any, but definitly hit. I think the head had been shaved prior to my getting it, so that may have played into it. I bolted it together with some clay on the pistons, then spun the crank. It looked like it was going to work, but must have gotten closer as it heated up.

      Long story short, it may be well worth the time to cut valve reliefs in the ABA pistons (~8.5:1 CR) or use 9a pistons (~9.2:1 CR).
      is there a way to make the valves not come open as much. is that even possible?
      Last edited by Moshua; 12-08-2012 at 06:12 PM.

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