will a bobbed crank for 2.8l stroker balance out?

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  • digger
    R3V Elite
    • Nov 2005
    • 5926

    #16
    Originally posted by redlightpete
    2. Is it a problem that the counterweights are smaller? No. It might be an issue in a vee configuration or a single, and then you might add "bob" weights to compensate.
    yeah its not like there are no counterweight which would be a problem, they are still substantial even after machining
    89 E30 325is Lachs Silber - currently M20B31, M20B33 in the works, stroked to the hilt...

    new build thread http://www.r3vlimited.com/board/showthread.php?t=317505

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    • LJ851
      R3V OG
      • Nov 2010
      • 7918

      #17
      Originally posted by redlightpete
      2. Is it a problem that the counterweights are smaller? No. It might be an issue in a vee configuration or a single, and then you might add "bob" weights to compensate.


      You are confused. The bob weight is a calculated percentage of the weight of the rod and piston. The bob weight does not change to compensate for crank mods.

      On a 90 degree V engine (single pin) a balance factor of 50% is typical. If the counterweight of the crank is not heavy enough to counter the required bob weight, holes will be drilled in the counterweight and heavy metal is inserted.


      None of this applies to an inline 6 crank as previously mentioned.
      Lorin


      Originally posted by slammin.e28
      The M30 is God's engine.

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      • redlightpete
        Wrencher
        • Mar 2012
        • 260

        #18
        Originally posted by LJ851
        You are confused. The bob weight is a calculated percentage of the weight of the rod and piston. The bob weight does not change to compensate for crank mods.

        On a 90 degree V engine (single pin) a balance factor of 50% is typical. If the counterweight of the crank is not heavy enough to counter the required bob weight, holes will be drilled in the counterweight and heavy metal is inserted.


        None of this applies to an inline 6 crank as previously mentioned.
        Sorry for the additional confusion regarding bobweights.

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