GNAT - Rebuild - The Sequel

Discussion in 'Car Builds, Projects, Idea's Experiments' started by Nathan, May 11, 2015.

  1. Nathan

    Nathan Founder

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    Not really.

    The engine mount from Greene performance has been delivered to Detroit tuned.

    Jan is having a head gasket made. since It's bored over the OEM one won't fit correctly. Also the head has been milled so there needs to a bit more height to the gasket.
     
  2. 05r50

    05r50 Well-Known Member

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    So when you are in this situation is it better to plan for what if and have a spare gasket made at the same time?

    Never had this so I don't know what kind of turn around it takes to get one made ad hoc.
     
  3. Minidave

    Minidave Well-Known Member
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    Is it being cut from copper sheet?
     
  4. Dave.0

    Dave.0 Helix & RMW Powered
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    I think it would be a copper core with reflex style graphite style coating for a perfect seal.
     
  5. Nathan

    Nathan Founder

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    Updates!

    Jan shipped today. Woohoo...

    So, what am I getting that I'm not even going to get to see in the flesh....

    Injectors - clean, calibrate, new o-rings and pigtails. The reports on the injectors are in the box. I'll post them at a later date.

    Head has new seats installed, new guides installed, CNC'd chambers, new springs, single groove keepers, titanium retainers, 1.8mm oversized Intake valves, 2.3mm oversized inconel exhaust valves all replaced

    Head Gasket - 78mm .050 thick

    RMW Dominator Camshaft

    I'm Happy.
     
  6. Firebro17

    Firebro17 Dazed, but not Confused
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    Happy, Happy - Joy, Joy! :Thumbsup:
     
  7. AAONMS

    AAONMS Well-Known Member
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    Great news
     
  8. nxtMINI

    nxtMINI Active Member

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    Fantastic! one step closer to getting gnat back
     
  9. Dave.0

    Dave.0 Helix & RMW Powered
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    Don't forget the correct plugs and get it tuned this time. :eek:
     
  10. Batrugger

    Batrugger New Member

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    Glad to hear. RMW deliveries are always good. Looking forward to it being finished.
     
  11. Jan

    Jan Well-Known Member
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    #111 Jan, Jul 29, 2015
    Last edited: Jul 29, 2015
    forgot to post these before.............
    so after tearing the head apart we found out the reasons why it failed
    Nathan had another shop in the past work on the head ..........and in their not so infinite wisdom ,put expoxy in the INTAKE ports. As you can see from the pics it was chunking out and into the combustion chambers. Some of the expoxy got stuck under the exhaust valve and caused it to burn the valve.

    They had also shimmed the springs to where it was coil binding. Which explains why when I drove the car the car was soft on power.

    All new springs now, new valves, new guides etc.........It's like a brand new head again. Can't wait for Nate to see the new found power.
     

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  12. Minidave

    Minidave Well-Known Member
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    Were they trying to reshape the ports with the epoxy for better flow?
     
  13. Ryephile

    Ryephile New Member

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    Good to see you found the problem Jan.

    Best of luck to Nathan in getting GNAT back up and running stronger than ever!
     
  14. Batrugger

    Batrugger New Member

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    Wow that's just nuts.
     
  15. Jan

    Jan Well-Known Member
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    yes..........I guess he thought he was a better porter than the guy with more records than God.........:devil:
     
  16. Nathan

    Nathan Founder

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    That was to weld a crack. Yeah, that didn't work.

    I had no idea at the time this is how they "fixed" it before.
     
  17. Zapski

    Zapski Well-Known Member

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    [​IMG]
     
  18. Minidave

    Minidave Well-Known Member
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    Ha!

    Yeah, I can't imagine epoxy as a good material for that application.....and spring coil binding? Come on - that's cylinder head 101 fer chrisakes!

    We are Groot!
     
  19. Jan

    Jan Well-Known Member
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    there was no cracks in the head and the only welding was on the stud for the intake manifold so I am not sure what was done besides adding the epoxy and the crazy shimming of the springs. Oh well........it's good now:Thumbsup:
     
  20. cct1

    cct1 Well-Known Member
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    Epoxy on a hot Iron block?

    Duct tape, that's always the answer.
     

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