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What to expect????

This is a discussion on What to expect???? within the General Help forums, part of the LSx Technical Help Section category; Ive got a 99 Z 6 spd. with ALOT of mods. Went to start it Monday after a week and ...

  1. #1
    Junior Member jrabbet's Avatar
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    What to expect????

    Ive got a 99 Z 6 spd. with ALOT of mods. Went to start it Monday after a week and a half of siting and it starts and pops all at once. Now I got a window in the pan in line with #2 cylinder. I havent started tearing into it yet, The only thing I can figure is broke rod.. ganna try to get it out this weekend. Other than a leaky injector what could have caused it?

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    Senior Member Redphoenix1998's Avatar
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    1998 Pontiac Trans Am

    bearings went bad?

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    Junior Member jrabbet's Avatar
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    5k on the engine. no noises at all in the past. broke when it fired first time..

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    Senior Member Redphoenix1998's Avatar
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    could be broken rod if #2 was hydrolocked but that's kind of hard to really do. You may just have to start tearing into it

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    O U 8 1 2 Spaz's Avatar
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    1999 trans am

    fuel puddle would be my best guess...

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    Junior Member jrabbet's Avatar
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    Thanks guys, I will have it out this weekend.. Wish me luck

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    1999 Z-28 camaro

    maybe a soft rod....if was a new one. had that happen on a race car before

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    Member NoscamaroSS's Avatar
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    Have you had alot of rain lately?
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    Junior Member jrabbet's Avatar
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    Yes, That is the reason for it sitting..

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    Member NoscamaroSS's Avatar
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    Ive seen a couple of instances where water "rained down" on the motor from the cowl. Somehow the water made its way into the motor, im gonna assume around the intake gasket or possibly the injector o-rings, and when they are started, they pretty much immediately throw a rod.

  11. #11
    Junior Member jrabbet's Avatar
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    The engine is dry. The only way it could get water on it is if it were to sweat

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    SOM
    1998 T.A.

    Get your injector for that cylinder checked. You wouldn't be the first one to break a rod from this........

  13. #13
    Junior Member jrabbet's Avatar
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    Ok cool. I was hoping I wasnt the only one..

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    Member c5z28's Avatar
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    On your ass flashing
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    Dr.Crash had that happen to him apparently, he might be able to help but you may have to e-mail him as he has not been on for awhile.

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    402 Guru 402 Guru's Avatar
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    +1

    Quote Originally Posted by Spaz View Post
    fuel puddle would be my best guess...
    +1 if you had a leaking injector it could dump raw fuel into your cylinder and have to much combustion and Pop a cylinder right in half ( Sounds like a gun shot is the only at to describe it )the only way to tell 100% is to start tearing the heads off and inspect the damage worst case that is and you have some cool lookin paper weight's like the notorious #7 cylinder on the ls1 that just go out of no where. Good luck with the Tear down give your self a weekend with some buds or do it yourself like i like to do then u have plenty of time not to rush , what kind of mods do you have ????
    Last edited by 402 Guru; 11-20-2009 at 07:26 PM.

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    Junior Member jrabbet's Avatar
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    Texas Speed 404 Stroker, Fast 92 intake and Nick Williams Throttle Body 95mm, Stage 2.5 heads, Futral Cam, Diamond pistons, ARP studs, Forged bottom end, Fast Toys lid, 1-5/8's AR headers, Fab 9 in w/full spool, 35 spline mosers, Chrome moly Drive Shaft, UMI safety loop, UMI Trq Arm, UMI Panhard Bar, FLSFC's, Hotchkiss springs, 5.0 short throw shifter, cartech level 7 clutch, Tick Master/Slave/Bleeder Kit, and a custom dyno tune by RPM

  17. #17
    Junior Member jrabbet's Avatar
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    I run a restoration shop, so I have everything to do it myself, rushing wont be necessary.

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    SOM
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    Quote Originally Posted by un17real View Post
    +1 if you had a leaking injector it could dump raw fuel into your cylinder and have to much combustion and Pop a cylinder right in half ( Sounds like a gun shot is the only at to describe it )the only way to tell 100% is to start tearing the heads off and inspect the damage worst case that is and you have some cool lookin paper weight's like the notorious #7 cylinder on the ls1 that just go out of no where. Good luck with the Tear down give your self a weekend with some buds or do it yourself like i like to do then u have plenty of time not to rush , what kind of mods do you have ????

    It is not from too much combustion it is from the cylynder being so full of fuel that it will not compress so the rod breaks on the compression stroke......

  19. #19
    402 Guru 402 Guru's Avatar
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    Quote Originally Posted by SOMbitch View Post
    It is not from too much combustion it is from the cylynder being so full of fuel that it will not compress so the rod breaks on the compression stroke......
    well i am engine builder for 15 years and it could very well be the rods or the piston its very hard to tell 100% unless you tear it down so we are both dead on
    Last edited by 402 Guru; 11-21-2009 at 12:49 PM. Reason: 100%

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    SOM
    1998 T.A.

    If it is a leaky injector I bet 10-1 it is the rod. Every case I have seen it has ALWAYS been the rod........

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