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430 Challenge Engine Repair

Discussion in 'Challenge/GT Cars/Track' started by UAS, Jan 24, 2013.

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  1. UAS

    UAS Formula 3
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    Jul 2, 2008
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    #1 UAS, Jan 24, 2013
    Last edited by a moderator: Sep 7, 2017
  2. UAS

    UAS Formula 3
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    Jul 2, 2008
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    #2 UAS, Jan 24, 2013
    Last edited by a moderator: Sep 7, 2017
    Engine Removal and Disassembly continues:
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  3. UAS

    UAS Formula 3
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    #3 UAS, Jan 25, 2013
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  4. UAS

    UAS Formula 3
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    #4 UAS, Jan 25, 2013
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  5. UAS

    UAS Formula 3
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    #5 UAS, Jan 25, 2013
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  6. kylec

    kylec F1 Rookie
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    Jun 9, 2005
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    Orlando
    #6 kylec, Jan 26, 2013
    Is it possible to pull the head without pulling the engine?
     
  7. UAS

    UAS Formula 3
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    #7 UAS, Jan 27, 2013
    Unfortunately not... With the engine in the car, it is not possible to torque the heads properly, and actually would make the repair way more time consuming
     
  8. Ingpr

    Ingpr F1 Rookie

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    #8 Ingpr, Jan 28, 2013
    This is just great!
    Love to see project like this. Keep it coming!
     
  9. Perkman87

    Perkman87 Formula Junior

    Jul 23, 2010
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    #9 Perkman87, Jan 28, 2013
    Keep us Updated!
     
  10. UAS

    UAS Formula 3
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    #10 UAS, Jan 29, 2013
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  11. Ferraripilot

    Ferraripilot F1 World Champ
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    May 10, 2006
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    #11 Ferraripilot, Jan 29, 2013
    I'm curious, but what was considered high leakage for this motor?

    Regards
     
  12. Ingpr

    Ingpr F1 Rookie

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    #12 Ingpr, Jan 29, 2013
    Nice!
    Can you share the exact aluminum spray paint you used? Looks amazing!
     
  13. UAS

    UAS Formula 3
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    #13 UAS, Jan 30, 2013
    Acceptable leakdown on a good used engine is usually 10% or lower. Most new to almost new engines are 5% or lower. This car had (2)cylinders above 60% and all others above 10%.
     
  14. redzone

    redzone Formula 3
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    Mar 31, 2007
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    #14 redzone, Feb 1, 2013
    Can you post more photos of the valves and the seats that were the issue/had the 60% leakdown?
     
  15. UAS

    UAS Formula 3
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    #15 UAS, Feb 1, 2013
    Unfortunately the heads are already at the machine shop and are recieving a full valve job...sorry
     
  16. UAS

    UAS Formula 3
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    Jul 2, 2008
    1,193
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    #16 UAS, Feb 13, 2013
    Last edited by a moderator: Sep 7, 2017
  17. Capristo Exhaust USA

    Capristo Exhaust USA Formula Junior
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    Jul 29, 2009
    378
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    #17 Capristo Exhaust USA, Feb 13, 2013
    Last edited: Feb 13, 2013
    Amazing job once again from Universal Autosports.

    Quick questions: Were these heads completely overhauled during the previous rebuild ? If yes...
    - What air filter was ran on that car?
    - Are they regularly replaced/ serviced ?

    It is undeniable that Universal Autosports does maintain the cars under their care very well, but prior to that what was the maintenance history on this car?

    This kind of failure can be caused by foreign particle ingestion. (ie dust)

    Previous repairs on the valve seats could have being done improperly.

    What type off fuel quality is run on this car?

    Since this engine have already got a rebuilt history, what is the condition of the injectors?

    Just our 2cents worth
     
  18. UAS

    UAS Formula 3
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    #18 UAS, Feb 13, 2013
    Last edited: Feb 13, 2013
    The engine has only 4,000 kms and has no signs of being apart or rebuilt in the past, and still has its factory seals. The air cleaners are new replacements provided by Capristo when the exhaust system was purchased, about 3 events old. The fuel that was used was either 93 or 95 unleaded..whichever was available at the track.

    All of our other cars are prepared and run the same way with no issues. There was signs of the intake valves leaving light markings on the pistons showing signs of contact.
     
  19. Capristo Exhaust USA

    Capristo Exhaust USA Formula Junior
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    #19 Capristo Exhaust USA, Feb 13, 2013
    Remember that this could have being attributed to maintenance before you received the car for you continuing maintenance.

    Leaking intake valves are not an immediate failure .It happens over time .
    If you say that you see contact between valve and piston ,could this not point to timing .
    Question What was timing on this engine before disassemble.

    Even with new engines an assembly errors can occur.Were these valve springs checked for pretension and spring rate ?

    This can happen even to an engine with 100 miles
     
  20. UAS

    UAS Formula 3
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    #20 UAS, Feb 15, 2013
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  21. ktr6

    ktr6 Formula Junior

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    #21 ktr6, Feb 16, 2013
    Very nice thread, thank you for posting. I wish my car had chains.
     
  22. Ingpr

    Ingpr F1 Rookie

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    #22 Ingpr, Feb 16, 2013
    This guy make everything looks so easy!!!
     
  23. charbatgoula

    charbatgoula Rookie

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    #23 charbatgoula, Feb 16, 2013
    Amazing work, Art with a big "A". Thanks for sharing.
     
  24. jm3

    jm3 F1 Rookie

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    #24 jm3, Feb 16, 2013
    Usually a missed downshift or three.
     
  25. nmercier

    nmercier Rookie

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    #25 nmercier, Feb 17, 2013
    Missed downshifts (overrevs) usually bent valves not burn them. The slapping of valves on the cylinder can be either the overrevs or a bad timing setup. Since they are burnt (excessive heat) I am going wuth the bad timing setup along with a combination of running bad (cheap) gas more than once which inturn usually causes the motor to run constantly hot.

    Great thread. If I am not mistaken that car was a casualty at Monticello last year.
     
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