Question about balancing rotating assembly

jcwren said

Thanks for replies.

I had found information in my books and online about balancing, but I didn't find any numbers about what was out of spec. I suspected the 12 grams was acceptable since those were the original rods, but never found a comment about "xx is too much!".

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There is probably no spec. The rods are all weighed and all lightened to the weight of the lightest one. All the reciprocating weight is added to the crant throws (bob weight), balanced on a machine and weight is added or material removed from the crank throws to balance the assembly. You can "weight match" the rods but it's not balancing the engine.