Slow 4 inline cylinder engines in early tractors were balanced by equal weight moving parts. The pistons on the ends move up, the pistons in the middle move down. The crank and engine are modestly balanced. As more speed and HP were asked of the designs, the harmonics and end to end balance issues were breaking cranks. To reduce breakage and improve operator comfort, 2 more main bearings, and counter weights have been built into the design These are inherently out of balance these vibrations need balance shafts to get them under control. This is not intended to be a high science definition. But I hope it makes sense. Jim
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Today's Featured Article - History of the Nuffield Tractor - by Anthony West. The Nuffield tractor story started in early 1945. The British government still reeling from the effects of the war on the economy, approached the Nuffield organization to see if they would design and build an "ALL NEW" British built wheeled tractor, suitable for both British and world farming.
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