Dynamic Balance

Discussion in 'Vincent' started by worntorn, Dec 14, 2017.

  1. robs ss

    robs ss VIP MEMBER

    Aug 16, 2016
    Sorry Glenn - my comment was directed a the Norton twin crankshaft - I should have been more specific.
    You comment holds true for singles' crankshafts as well - although I personally don't see much merit in dynamically balancing those as the mass of the flywheels is very narrow/central.
    The same logic could be true for Vincents?

  2. worntorn


    Dec 22, 2006
    I can't say for sure as I have only had the dynamic balancing done to this one Vincent crank and we also changed the bf dramatically.
    John Mcdougall, who rebuilt scores of Vincent engines, swore by the dynamic balance after trying it on one engine and getting an excellent result.

  3. p400

    p400 VIP MEMBER

    Jul 14, 2014
    so, my reciprocal weight is
    2 piston assemblies - 930gm
    2 rod pin ends - 380
    total - 1310gms

    if my desired balance factor is 46%, then .46 x1310=603gms
    subtract the fixed pin ends 603-380=223gms
    then I would expect my Pit Posse rig hanging balance weight to be 223gms.

    It seems I measured 220gms.
    close enough?
  4. worntorn


    Dec 22, 2006

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