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Old 01-24-2005, 06:32 PM
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balanced rotating assembly?????

hi all.been away for awhile.taking a break from hot rodding.got my rotating assembly back today from being balanced and was realy shocked to find not much done to it in the way of grinding or welding. the only grinding done was where i told them to grind for cam clerance on the rods.when asked if he weight matched the pistons and the rods he said that he did.i can see where he bolted the flywheel and the harmonic bal. on the crank so he must have spun it at least one time. i asked how much iron he had to put on the crank and he said none that he had to take some off. but again no marks.either i bought some realy good close parts or i got a balanced rod in my tailpipe.the shop that i took it to is a well known shop with a long reputation for building bad ***** racing engines,but after i took all my stuff down to him, i started hearing bad things about the shop.like he dont check the rod weights or the piston weights.i heard this from two diffrent sorces.o well a bought lesson is better than a borrowed one.

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Old 01-24-2005, 07:49 PM
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Well there are a couple of things you can check/do. First almost always when weighing up parts I'll mark each as to gram weight. So see if any of the parts have weights written on them. PIstons are almost ALWAYS marked with a Sharpe as pistons are almost never all the same. Second when balancing a rotating assembly there is a bobweight sheet made out to track the job. I suspect you didn't get this. A question to ask the builder is what the bob weight was and what he balanced the pistons to. Then ask for the bob weight worksheet showing all the components and total bob. It's always good to have this info as there could be a time in the future you burn a piston and need to replace.
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Old 01-25-2005, 05:32 AM
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yea. i forgot to ask for a balancing card. i was in a hurry (lunch break) and just forgot. i think i have a bad case of C-R-S. .
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Old 01-25-2005, 12:46 PM
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C.R.S. gets worse the longer your married.
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Old 01-25-2005, 01:03 PM
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A good balance job involves weighing the rods and matching them to to lowest weight (each end) and matching the pistons to the lightest one. What some hacks do is to weigh one piston and one rod and hope the rest are close.

There should be drill marks or holes in the end counterweights. Perhaps the guy drilled in the original balance holes and the new holes are hard to see.

Good luck.

tom
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