Re: Crankshaft Balancing, I got a problem with Step 4?
You need to factor in the weight of the bottom half of the connecting rod with the top half of the rod so you know how much weight to add, or subtract if you wish, from the flywheels to get them to balance in the rpm range you choose. The bottom half of the rod probably affects the balance of the rotating assembly where as the top half of the rod and the piston assembly has more effect on the reciprocating balance issues. That's why the top end is calculated with a balancing factor and the weight of the bottom is just added to that number. That's my basic WAG anyway.