318 magnum vibration.

Discussion in 'Magnum Engine Swaps' started by Rick Wellman, Oct 5, 2018.

  1. Rick Wellman

    Rick Wellman FABO Gold Member FABO Gold Member

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    i put a 2000 model 318 magnum in my 65 cuda. Bought a flywheel and bellhousing off FABO. Have a vibration in the engine. At 3000 rpms it vibrates pretty bad. How can I tell if I have the wrong flywheel. Are there numbers on the flywheel. I’ve heard that 318 magnums are externally balanced.
     
  2. dragbaron

    dragbaron Well-Known Member

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    The 5.2(318) magnum is internally balanced, the 5.9(360) is externally balanced. So two possible ideas are:
    Maybe you have a 5.9 and not a 5.2
    Maybe that flywheel came off an LA 360.
     
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    • pishta

      pishta I know I'm right....

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      Did the flywheel look solid (ie. no scallops cut out or weights added?) EVERY 318 was neutral balanced.
      Chrysler Small block



      • 318 A (POLY)-Internal
      • 273-318-340 (340 to 1971 Steel Crank) LA-Internal
      • 340 (1972 up w/Cast Crank) External
      • 360-External


      Chrysler MAGNUM Engine



      • 318 (5.2) Internal
      • 360 (5.9) External
      • 5.7l, 6.1l, 6.2l, 6.4l HEMI- Internal
       
    • Rick Wellman

      Rick Wellman FABO Gold Member FABO Gold Member

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      I ran the numbers and it is definitely a 318 magnum. I pulled the engine from a 2000 dodge van. I bought a flywheel from Tony’s Parts on FABO. It bolted right up. Could he have sent me a 5.9 flywheel ? How do I tell the difference in a 5.2 and a 5.9 flywheel ? There are no scallops or added weights on the flywheel. Thanks for you guys replying. Rick
       
    • oldskool979

      oldskool979 FABO Gold Member FABO Gold Member

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      Did you change the harmonic damper to an aftermarket unit? They are also specific to internal/external balance.
       
    • Rick Wellman

      Rick Wellman FABO Gold Member FABO Gold Member

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      No, I used the original but went to v belts instead of serpentine