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Engine+Flywheel Balancing

Discussion in 'The Garage' started by ccj8008, Apr 21, 2006.

  1. ccj8008

    ccj8008 1/2 ton status

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    I recently swapped a Clark 5 spd in for my sm465 (behind a 454 TBI). The new flywheel and 13" clutch assembly are considerably larger. There is now some shudder (vibration) with the new assembly. I noticed that the old flywheel had some material drilled out to balance the rotating assembly. Does this mean I will need to pull the engine and have it and the flywheel balanced together? or...Any suggestions?
     
  2. Burt4x4

    Burt4x4 3/4 ton status

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    When I had my 454 balanced the flywheel & Pressure plate were balanced togeather...I ended up with little weights welded to the PPlate to get the setup balanced.
    When you put the new cluch in did your flywheel get replaced or machined/ground?
    Good Luck
     
  3. ccj8008

    ccj8008 1/2 ton status

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    Yeah, the flywheel was re-surfaced and the clutch/pressure plate are new. Is this a big block/internal balance issue that a small block would not have? I am going to send the flywheel/clutch assembly to a machine shop to see if they can be balanced, just to eliminate them as a factor.
     
  4. Thunder

    Thunder 3/4 ton status

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    The 454 is an externally balanced engine. If you change things around you have to git everything rebalanced. Talk to a shop that balances engines they will tell you what you need to get done.
     
  5. R77K10

    R77K10 Banned

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    time to do some more drilling

    thats what the holes are for, is to balance

    but needs to be done altogether on the 454 anyways

    entire rotating mass

    afaik and imho

    around here you are screwed as there are no shops, not close to here anyways

    no axle shops no chassis shops nothin


    good luck
     
  6. boz42

    boz42 1/2 ton status GMOTM Winner

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    not having the flywheel balanced can kill the engine.
     
  7. HarryH3

    HarryH3 1 ton status Author

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    Do you still have the old flywheel? If so, you can take it and the new flywheel to the machine shop. They can measure the balance of the old one and match the new one to it. :cool1:
     
  8. ccj8008

    ccj8008 1/2 ton status

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    That's what I like about this board, great idea, thanks.
     
  9. Jimbo*

    Jimbo* 1/2 ton status

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    Are you sure what engine was in front of the 5 speed? Most of those trannys were in C60 or larger, and had 427 tall deck engines. The 427 is an internally balanced engine; whereas the 454 is an externally balanced engine.
    Mark the flywheel you took off your 454, and when you pull the new one, compare the reverse side of them; the 454 flywheel will have a "bump" cast into it, where the 427 flywheel won't. Have your original 545 flywheel turned, and re-install it and I'll bet your vibration goes away.
    HTH
    Jimbo
     

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