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Thread: '27 JD Cut Down Project - SWAN

  1. #141
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    Quote Originally Posted by aumick10 View Post
    It just goes to show how subjective the balance factor is.
    Bike weight, gearing, riders style all come into account when deciding where to balance for.
    Mick
    Y'know, Mick,..

    I never found a V twin that was really out of balance.

    (Seen a few riders though.)

    ....Cotten
    AMCA #776
    Dumpster Diver's Motto: Seek,... and Ye Shall Find!

  2. #142

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    The factory balances motors when they manufacture them, but only to a cost and range of tolerances.
    If a V twin feels really out of balance, you had better check your crank pin real quick in my experience.
    It also depends on how much padding the rider is carrying.
    Mick

  3. #143
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    Yes I agree, Mick!

    Most 'bad vibes' are mechanical issues.
    But if the Factory missed the 'ideal' of sixty by three points, consistantly, that's a lot of rod top.

    At risk of repeating myself, re-balancing an overhaul of a 'stock' HD is only an exercise in feeling good.
    But grossly different rods or pistons demands it to sleep good.

    Even if it would have run fine anyway;
    My concern for Steve's project is the much different frame, which might like a different factor better than the modern ideal.

    ...Cotten
    PS: As some of us have experienced, just losing a top motor mount bolt is enough to 'put the motor out of balance'.
    (A lot of lot of padding "payload" aught to dampen vibes!)
    Last edited by T. Cotten; 03-12-2019 at 04:16 PM.
    AMCA #776
    Dumpster Diver's Motto: Seek,... and Ye Shall Find!

  4. #144
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    I was just reading about static balancing a Harley motor. I do not know enough about it to know if the process is correct though.

    http://www.caimag.com/wordpress/2011...;-how-i-do-it/

  5. #145
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    Quote Originally Posted by ryan View Post
    I was just reading about static balancing a Harley motor. I do not know enough about it to know if the process is correct though.
    Ryan!

    Before I spread my cookies where I don't want them,
    This isn't the guy who shaves his female tops to supposedly match the males, is it?

    ....Cotten
    AMCA #776
    Dumpster Diver's Motto: Seek,... and Ye Shall Find!

  6. #146
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    Cotten,
    It sure is the same guy. He sure tore the one rod up.

    From the article:
    "Why I decide to take the weigth of the connecting rod end instead of the piston,if customer want to change piston in the future to similar he will not change the end result by much and also connecting rods are there for a longer period of time ,first thing to do when doing job like that is planning where you want to take off the material without weakening the rod itself."
    Last edited by ryan; 03-12-2019 at 07:08 PM.

  7. #147
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    If you have females needing to shave their tops you've got a bigger issue than balance!!
    Robbie Knight Amca #2736

  8. #148
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    Gosh Ryan,

    We can now call over-thinking-to-the-point-of-destruction a syndrome;
    I fear he got this bad idea from S&S techs.

    The rod tops, the masses that actually move in different directions, were virtually the same to begin with.
    (Who can tell which is which in my attachment?)
    Half a female rod should always weigh more than the same proportion of the male because its a heavier rod.

    But the bottom halves move virtually in unison, as one mass.
    Mutilating the female is pointless and futile.

    ...Cotten
    PS: And I'm absolutely certain Wiff knows better, Steve!
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    Last edited by T. Cotten; 03-13-2019 at 02:32 PM.
    AMCA #776
    Dumpster Diver's Motto: Seek,... and Ye Shall Find!

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