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Stock Cast Crank

Discussion in 'Turbo Tech Questions' started by 64 Sprint, Jul 5, 2007.

  1. 64 Sprint

    Joined:
    Feb 28, 2007
    Is any one out there running a stock cast crank in thier turbo 4.6?. I have a 98 Mark VIII engine i am building into a twin turbo and not sure whether or not to change the crank. What sort of RWHP are they good for?
     
    64 Sprint, Jul 5, 2007
    #1

  2. mustangpwr98

    Joined:
    Jun 9, 2004
    The cast mark cranks are stronger supposedly than the gt cranks. 750 hp is a number that gets thrown around alot.
    I have never heard of anybody busting a cast crank, even a gt crank. But, most dont boost them , they just go to a forged cobra crank. I would say go for it.
     
    mustangpwr98, Jul 6, 2007
    #2

  3. TurboShortBus

    Joined:
    Dec 22, 2003
    I know a local guy who picked an engine straight out of a Mark VIII, threw a Cobra intake at it, dunked it in his SN95 drag car with a big Vortech blower, put a C4 behind it, and let it rip. He was running mid/low 9s with it, and the stock valvesprings went flat long before anything had a chance to break. Don't worry about that stock 4.6L DOHC crank.

    Mark
     
    TurboShortBus, Jul 6, 2007
    #3

  4. Big Top GT

    Joined:
    Nov 10, 2004
    A cast crank will last a long, LONG time at a pretty high level of power. The number one killer of a crank is RPM, not HP.

    If you don't spin the car to the moon, a cast crank will live to about 700 hp. Anything more than that, you really have no business using a stock crank in the first place.


    :)
     
    Big Top GT, Jul 7, 2007
    #4

  5. 64 Sprint

    Joined:
    Feb 28, 2007
    so you think a rev limiter at about 7,000rpm is safe enough
     
    64 Sprint, Jul 7, 2007
    #5

  6. TurboShortBus

    Joined:
    Dec 22, 2003
    The rods and/or the pistons will go long before that crank does.

    Mark
     
    TurboShortBus, Jul 7, 2007
    #6
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