Hi Trev 29,

FYI.

"Every time the cylinders fire, torque is imparted to the crankshaft. The crankshaft deflects under this torque, which sets up vibrations when the torque is released. At certain engine speeds the torques imparted by the cylinders are in synch with the vibrations in the crankshaft, which results in a phenomenon called resonance. This resonance causes stress beyond what the crankshaft can withstand, resulting in crankshaft failure."

http://en.wikipedia.org/wiki/Harmonic_balancer


I wonder if you can weld the two sections together like you have suggested. And then place a some sort of damper in between the pulley and the mounting plate? Just a thought.