25-07-2018, 02:39 PM
Obviously the originals were "balanced" during production but I suspect they were not produced as matched sets, although were stamped with engine ID. The ones fitted to my '33 RP were not original to the engine or each other,so I thought I would match lighten polish and balance them. I took a fair amount of metal off just getting rid of casting feathers and grinding scours. They were balanced by removing metal mainly from the big end areas,which now enables them to just slide down the bores, thus making assembly (without splash plates fitted) easier. I would recommend balancing as much as possible to reduce vibration and improve reliability. Take a look on you-tube , under "balancing con-rods" some good DiY balancing jigs that you could make.