Can someone clarify the difference between an internally balanced and externally balanced crankshaft. On an externally balanced crank, the harmonic balancer and flywheel has weights to balance the crank. Am i right so far? The internally balanced crank does not and its perfectly balanced so it does not need these weights on the flywheel and balancer. Is that correct? Are there any pro's and con's. Whats better?
Yes, external weights. The pro on the internally balanced is you can change torque convertors with out balance issues. At least on fords and mopars, if you mix the two you will know it.