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Thread: 93 SC (347 turbo) Engine damage and repair pics

  1. #1
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    93 SC (347 turbo) Engine damage and repair pics

    Finally got motivated to pull the motor on my 93 SC today. Big thanks to Chris Wise for coming over to help. Expected to find a bent valve and some damage to the piston on the #4 cylinder where a valve spring dampner broke. It ended up being a lot worse.

    The head of the intake valve actually broke off and pretty much destroyed the combustion chamber, the piston and also damaged the cylinder wall slightly. Finally found the head of the #4 intake valve stuck inside the intake manifold in the #5 runner (opposite corner of motor). Turbine wheel also got damaged from smaller pieces of junk coming out of the cylinder. So instead of just fixing the heads and installing a new piston, it's going to need a full rebuild, with a new set of pistons and possibly a new set of heads.

    Here are some pictures of the carnage.
    Attached Images Attached Images      
    Last edited by David Neibert; 11-10-2015 at 01:29 PM.
    1991 SC AOD 4.2..2.3 Whipple..........10.910 @ 125.61
    2016 SRT Challenger Hellcat...............707HP/650TQ

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  2. #2
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    More pictures..............
    Attached Images Attached Images      
    1991 SC AOD 4.2..2.3 Whipple..........10.910 @ 125.61
    2016 SRT Challenger Hellcat...............707HP/650TQ

    My Garage

  3. #3
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    Last one for today....
    Attached Images Attached Images  
    1991 SC AOD 4.2..2.3 Whipple..........10.910 @ 125.61
    2016 SRT Challenger Hellcat...............707HP/650TQ

    My Garage

  4. #4
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    Wow, that valve stuck in the intake manifold is impressive.
    Kurt K (e-mail)
    SCCoA Member #: 443
    '92 SC AOD -- 11.521s @ 116.748mph, 2.0 AR power
    . . . . . . . . . -- 13.547s @ 101.01 mph, only w/ bolt-ons
    '95 SC 5spd -- All Stock, except 17" Simmons wheels.
    '90 SC 35th Anny 5spd -- 3rd owner, 16k miles
    2 '89 XR7 5spd's -- on their way out, really!

  5. #5
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    Ouch...well, at least you're over the hump and know the details now.

    Quote Originally Posted by David Neibert View Post
    So instead of just fixing the heads and installing a new piston, it's going to need a full rebuild, with a new set of pistons and possibly a new set of heads.
    ...and a turbo

    I had a valve break in a 289 one time and it did a 180, stabbed into the top of the piston and reverse fit into the valve seat in the head on the upstroke. Kind of turned a 4 cycle into a 2 1/2...

  6. #6
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    Wow that sucks David sorry to hear that news.
    MEMBER #2488 best rwhp 504 485 torque
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  7. #7
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    When did this happen? HOW does something like that happen? Wow.

  8. #8
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    ouch..Suck something in??
    They don't call me "SLOWPOKE" for nothin!
    http://www.sccoa.com/forums/garage_v...vehicle&id=110
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  9. #9
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    WOW! That sucks, what do you think caused it?

  10. #10
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    Damn, that sucks............Did that happen at the Shootout?
    SCCOA Member #2406
    '94 SC AUTO - $$$$ Pit
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  11. #11
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    Yikes that some pretty impressive damage.
    SCCoA Member#: 2515
    1990 SC AOD 2.1L Kenne Bell
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  12. #12
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    Sorry to hear....and see. That's gotta be a tough one to take. I almost feel more pain for vehicles than people.

  13. #13
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    Ouch! That is a major setback. Is that a dart block? If so, I think it can be bored out to 4.125", which would give you 363ci.

  14. #14
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    Quote Originally Posted by Toms-SC View Post
    When did this happen? HOW does something like that happen? Wow.
    Tom,

    It happened in early November just before the local track closed for the winter. Since the car had some issues at the Shootout and only made one clean pass I wanted to take another crack at getting a 9 second time slip while the car was still full of race fuel and had the slicks and skinnys mounted.

    This pass went pretty good except for spinning the tires hard coming off the starting line and resulted in a 10.067 @ 139.65



    Decided to give it another try with tire pressure reduced a little and boost slightly higher. Everything was okay until about the 1/8 mile point when is suddenly lost a lot of power and felt like it was missing. Thought it was just a burnt a plug wire or something simple, but as you can see it turned out to be a lot worse. This is the video when it broke.

    http://youtu.be/HRZgiW2lTHg

    From what I can tell it all this damage was caused by a valve spring dampner breaking on the #4 cylinder intake valve. The springs were iffy at the rpms I was turning and probably should have been upgraded to beehive style a couple years ago.


    David
    1991 SC AOD 4.2..2.3 Whipple..........10.910 @ 125.61
    2016 SRT Challenger Hellcat...............707HP/650TQ

    My Garage

  15. #15
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    Quote Originally Posted by MadMikeyL View Post
    Ouch! That is a major setback. Is that a dart block? If so, I think it can be bored out to 4.125", which would give you 363ci.
    Yes, it's an iron eagle Dart block and can be bored another .125" for 363 cubic inches, but I'll probably just go another .020" or whatever it takes to clean up the damaged bore to keep the displacement as close to 347 as possible. The PT76-GTS turbo I'm currently using would need to be replaced by something with a bigger turbine to avoid increasing the exhaust back pressure if I went all the way to 363. Not really interested in doing that right now. The turbo can be repaired pretty easily and is the least of my concerns.

    I need to take a little time and explore my options on machine work for the block and determine if the AFR 205 heads are even worth repairing.

    David
    1991 SC AOD 4.2..2.3 Whipple..........10.910 @ 125.61
    2016 SRT Challenger Hellcat...............707HP/650TQ

    My Garage

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