I work in whats left of the diesel engine manufacturing industry, mainly marine, rail traction, and power generation. Yes, I'm told that this crank was made from a single billet. Although large, the manufacture wil remain the same as a small crank. Each journal will be individually drop forged untill all the journals forged. Then the billet will be gripped whilst other journals are twisted by rotating through 60 degrees untill the crankshaft take onI would really be interested to see the manufacturing machinery. Is the crank a single billet and just how is it machined?