Crank is shot, thoughts?

Discussion in 'Engine Topic' started by 79RedZ, Dec 29, 2019.

  1. John Wright

    John Wright Veteran Member Lifetime Gold Member

    Messages:
    14,712
    Likes Received:
    215
    Joined:
    Aug 9, 2002
    Location:
    Rustburg, Va
    I spoke without realizing that the Scat crank in question was cast and not a forged piece. I used one of their forged 4340 cranks in my current sbc....I hope it holds up okay.
     
  2. 1980RS

    1980RS Veteran Member

    Messages:
    3,563
    Likes Received:
    652
    Joined:
    Jun 17, 2006
    Location:
    MN
    For the cost it cheaper to get a new scat crank than fix that old one.
     
  3. G72Zed

    G72Zed Veteran Member

    Messages:
    1,263
    Likes Received:
    302
    Joined:
    Sep 8, 2015
    Location:
    Canada
    I'm sure it will be fine, those 4340's forged ones take quite the abuse in Circle Track application. What are you making for HP, max RPM?
     
  4. John Wright

    John Wright Veteran Member Lifetime Gold Member

    Messages:
    14,712
    Likes Received:
    215
    Joined:
    Aug 9, 2002
    Location:
    Rustburg, Va
    Hasn't been on a dyno, but expect it is around 550 at the tire and I turn it to 65-68. It doesn't nose over under boost so I have to watch the shift light pretty close and resist the urge to let her eat.
     
  5. Cardinal

    Cardinal Veteran Member Lifetime Gold Member

    Messages:
    8,281
    Likes Received:
    33
    Joined:
    Jun 22, 2003
    Location:
    Endicott, NY
    OUCH! IMHO, get a new crankshaft.
     
  6. 79RedZ

    79RedZ Veteran Member

    Messages:
    716
    Likes Received:
    54
    Joined:
    Mar 24, 2009
    Location:
    Hamilton,MI
     
  7. 79RedZ

    79RedZ Veteran Member

    Messages:
    716
    Likes Received:
    54
    Joined:
    Mar 24, 2009
    Location:
    Hamilton,MI
    Yep. Looks like I can get a new one from summit for $267.
     
  8. vegas1974z28

    vegas1974z28 Moderator Staff Member Lifetime Gold Member

    Messages:
    4,661
    Likes Received:
    123
    Joined:
    Jan 10, 2002
    Location:
    Las Vegas,NV
    This sounds like the problem I've been having..... Interested to see what the problem is. We replaced the crank, even after it balanced out.

    It sheared the cam bolts off the timing chain.
     

Share This Page

  1. This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
    By continuing to use this site, you are consenting to our use of cookies.