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  1. twillcox

    Crank balance and design to minimize vibration

    Ki Kieran, I'm comfortable that we're getting the same results, see pic. Good work on that btw. So...the next step was to calculate main bearing loads which is a sum of moments/forces assuming each main is rigidly supported and each cylinder contributes only to the two nearest main bearings...
  2. twillcox

    Crank balance and design to minimize vibration

    Thanks Kier14, I have done exactly that with the rotating masses, i've also summed acceleration forces on the piston, and converted these to rod forces. The rod forces at it's respective angle is then applied to the crank pin, which is distributed by a moment sum to the crank main's. The...
  3. twillcox

    Crank balance and design to minimize vibration

    right...agreed. I have yet to dive into the 50% reciprocating value as a target, but was just using it for my simplified case of an inline-4. I just found out that running the inline-4 crank with a 1243 firing order (i.e., crank journals are up-down-down-up at tdc #1), gives a "ZERO" force in...
  4. twillcox

    Crank balance and design to minimize vibration

    Hello, I am designing a new crank for a motorcycle and I have some questions regarding the balance factor. I've written an excel based program to calculate main bearing forces as a function of the dynamic balance of the crankshaft and reciprocating (primary and/or secondary rod forces). I...

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