question on balancing

T

thebestdj07

New member
if i am keeping the same crank and pistons but putting in new rods would i just have to balance the rods or the whole rotating assembly?
 
The crank is what is going to be balanced. You need to measure the weight of the entire rotating assembly. Rods, rod bolts, pistons, wrist pins, rings, ect. Once you have a bob weight you'll check the crank and balance accordingly.
 
Most good shops will weigh the pin ends and big ends of the rods and equalize them to the lightest one. Most aftermarket companies do this and sell their rods in "matched sets". Look at a set of production rods, and you will see the rectangular pads on the ends? Those are for the factory to grind off material to get the balance at least close. Once the rods are equalized, you use those number to develop your bobweight to balance the crank.

You need to compare the pin end weight and big end weight of the old rods and the new ones. NOT just the total weight. If they are substantially different, you will need to re-balance the crank.

Hope this helped.
 
cool thanks, from what i've read the rods weigh about the same. (stock 4.6 and the new boss 302) I need to get a scale and rig up a stand.
 
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