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    Thread: 2.9l Vr6 build question- piston ring end gap

    1. Member
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      03-18-2017 04:51 PM #1
      Ok so long story short I took my 2.8l aaa block to a machine shop that another corrado owner had dealt with before and he highly rec this place. Anyway got the block bored to fit 2.9l cast Pistons from four seasons which came with rings installed. When I went to gap my rings I was getting gaps of approx .55-.66 mm on both compression rings. So I had the machine shop order another set from a supplier they trust. I'm still getting the same measurements. The Bentley calls for .20-.40mm for the 2.8l. Are these the same specs for the 2.9l? Help

    2. Member
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      03-18-2017 05:08 PM #2
      In this case I wouldn't go by the Bentley. I would contact the company you purchased the pistons from and get their recommended gaps


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    3. Member
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      03-18-2017 05:24 PM #3
      Thanks for the advice. I def will


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    4. Geriatric Member need_a_VR6's Avatar
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      03-18-2017 07:37 PM #4
      The cast pistons should use the same ring gaps as stock. Do you have bore measurements from the machine shop?
      -Paul
      1992 Corrado - ALL MOTOR Drag Project
      1995 GTI VR6 - Retired - 12.90@106 R32 power - 12.833@106 12v power
      KPTuned - Official MegaSquirt: Sales - Repair - Installation - Tuning

    5. Member
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      03-19-2017 07:56 AM #5
      On my receipt it says bore 6 cylinder to 3.2291" for .0016" clr

    6. Member
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      03-19-2017 08:17 AM #6
      Kind of frustrating because this is my first engine build and I'm trying to build confidence to do this again in the future.

    7. Geriatric Member need_a_VR6's Avatar
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      03-19-2017 01:20 PM #7
      More like .0019" (or more depending on how the pistons measure) should be no issue. Maybe you have the wrong rings
      Still?
      -Paul
      1992 Corrado - ALL MOTOR Drag Project
      1995 GTI VR6 - Retired - 12.90@106 R32 power - 12.833@106 12v power
      KPTuned - Official MegaSquirt: Sales - Repair - Installation - Tuning

    8. Member
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      03-19-2017 01:30 PM #8
      When I bought the pistons from four seasons they sent me mahle pistons with rings already on them. When I saw the measurements I was getting I called the machine shop and they ordered from their supplier. .40 over top line brand. Similar numbers


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      03-19-2017 01:31 PM #9
      I'm going to grab the nessesary tools from my shop tomorrow and attempt the verify the cylinder bores then call the machine shop back. I hope I don't have a big expensive paper weight


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    10. Geriatric Member need_a_VR6's Avatar
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      03-20-2017 09:52 AM #10
      I would also mic out your feeler gauges to make sure it's a good set. Seen some china ones that are labeled wrong.
      -Paul
      1992 Corrado - ALL MOTOR Drag Project
      1995 GTI VR6 - Retired - 12.90@106 R32 power - 12.833@106 12v power
      KPTuned - Official MegaSquirt: Sales - Repair - Installation - Tuning

    11. Member
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      03-20-2017 10:10 AM #11
      It's a snap on set but can't hurt to do that. I think they ordered the wrong ring set. Doesn't seem to be .40 over. Might be .30 over instead


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    12. Member
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      03-20-2017 12:46 PM #12
      So it talked to an engine builder at tectonics and he said run it. Don't lose any sleep over those ring gaps.


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    13. Member Masterchief1804's Avatar
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      Yesterday 01:53 PM #13
      Good luck! Let's see some progress!

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      Yesterday 05:24 PM #14
      Thanks. It's been a 3 year long process with its share of bumps in the road.


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    15. Member Masterchief1804's Avatar
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      Yesterday 06:08 PM #15
      Tell me about it, I've been gathering up turbo parts for a good 6 months but I'm almost there! I pretty much have everything except now I want to rebuild bottom end since I have fresh head and cams. Haha **** man, I'd say those are good bumps on the road.

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    16. Member
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      Yesterday 06:19 PM #16
      lol yeah. The other big bump was when I got the car painted. What a nightmare. That took over a year. I'll make a build thread soon and go over everything. It will be therapeutic. I'd like to inspire others like some have done for me


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