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Thread: pistons and rings 08 firebolt xb12r

  1. #1
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    pistons and rings 08 firebolt xb12r

    what pistons besides wiseco? at 8200 miles dropped valves in both cylinders at 6000 rpm/anybody use andrews cams?

  2. #2
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    I use CP pistons and Cat 3 cams from NRHS

  3. #3
    Senior Member Cooter's Avatar
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    An extremely rare catastrophic failure... and simultaneously in 2 pistons?

    Whats the whole story sandman? Your use/abuse would dictate what new engine to build that will last, because stock obviously ain't enough for you

  4. #4
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    I agree scorpion king. Seems like a bit of info is missing...

  5. #5
    Senior Member 34nineteen's Avatar
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    Quote Originally Posted by mike lowary View Post
    I use CP pistons and Cat 3 cams from NRHS
    I use pistons/cylinders and Cat 3 cams from NRHS as well. Dan at NRHS is pretty awesome.

  6. #6
    How do valves just "fall" into the cylinder? Ive never heard of this on any bike or car/truck.

  7. #7
    Senior Member 34nineteen's Avatar
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    Quote Originally Posted by young scooter View Post
    How do valves just "fall" into the cylinder? Ive never heard of this on any bike or car/truck.
    I agree. Its either a one in a million shot of bad luck... or someone not being accurate of what happened. Maybe he meant both valves in one cylinder... or he meant 8000rpm instead of 6000.
    Last edited by 34nineteen; 06-17-2020 at 04:21 PM.

  8. #8
    Senior Member outthere's Avatar
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    Maybe he's one of those people who like to rev until it bumps off the limiter in neutral for an unlimited amount of time.

  9. #9
    Senior Member Cooter's Avatar
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    A valve spring or retainer would have to break, and the result would be catastrophic to the head, the piston, and probably the cylinder too. Ultra rare to happen in even one cylinder, much less twice at the same time. I'm sure the OP is just guessing for now, I'm real curious what he finds. Crank pin?

    Are Buell engines interference engines? Not that the gear driven cam would ever skip, I'm wondering if valve float at NASCAR rpms could even touch the piston?

  10. #10
    Senior Member 34nineteen's Avatar
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    In this case it would be all 4 breaking... and at the same time.

    His fuel pump probably went out.



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