Ballancing a 1973 340
Ok, points taken. Thank you for your input.
Just so you know...these things will run without shaking with a considerable amount of imbalance. I've seen both ends off as much as 60 grams and not shake. The reason I mention this is because I've also seen some stuff that was out 30 grams on one end and shake like a dog pooping peach seeds.
I'm the first to admit that there are somethings (a lot really) I don't understand the frequencies involved and what can actually cause a shake. Sometimes it can just be the resonance frequency of the sum of the parts that will tolerate a higher imbalance that another combination may shake with. There is a bunch of science to it.
That's why I'm always leery of trying to balance parts seperate from each other. You can get, let's say the flywheel end to under a gram, and balance the FW, PP and disc to a gram or so and bolt it up and it will change the flywheel end by 10-15 grams. I can't say why, but maybe someone here can explain it.
Just be careful that you don't end up spending money twice.
