Harley-Davidson engine timeline

Harley-Davidson engines are a line of engines manufactured since 1903 in Milwaukee, Wisconsin by the Harley-Davidson company for use in its motorcycles. Harley-Davidson engines are now made at Harley-Davidson Motor Company's Pilgrim Road Powertrain Operations facility in Menomonee Falls, Wisconsin.

The company's founders started making smaller flathead motorcycle engines individually by hand and fitted to bicycles in the 10 ft x 15 ft wooden barn in Milwaukee that was the Harley-Davidson workshop of the time, prior to that in 1901.

That first engine was a single cylinder model, based on the French developed De Dion-Bouton internal combustion engine.

The company was soon fully committed to producing its own proprietary engine designs, and by 1909 the first Harley-Davidson V-Twin engine had been designed and made, setting a template for engine design that continues today.

Engine timeline
Big Twin (Stock) Engine Sizes:
 * Flathead                  45ci (737cc)
 * Knucklehead               60ci (983cc)   & 74ci (1212cc)
 * Panhead                   60ci (983cc)   & 74ci (1212cc)
 * Shovelhead                74ci (1212cc)  & 82ci (1343cc)
 * Evolution                 82ci (1343cc)
 * Twincam                   88ci (1442cc)  & 95ci (1556cc) (88/96ci bore 3.75in (95.25mm) & 4.00in stroke on 88ci (101.6 mm)
 * Twincam                   96ci (1584cc)  & 103ci (1690cc)(96/103ci bore 3.875in (98.40mm) & 4.38in stroke on 96ci (111.25 mm)
 * 2017-Milwaukee-Eight      107ci (1746cc) & 114ci (1868cc) & 117ci (1923cc)
 * 2016-Milwaukee-Eight      114ci (1868cc)


 * References:
 * Henshaw, Peter, Kerr, Ian, "The Encyclopedia of the Harley-Davidson", 2001, Chartwell Books, Inc., ISBN 0-7858-1274-1
 * Flatheads, Knuckleheads, Panheads, Shovelheads | A Guide to Harley-Davidson Engines, Devitt Insurance, 2021.
 * Henshaw, Peter, Kerr, Ian, "The Encyclopedia of the Harley-Davidson", 2001, Chartwell Books, Inc., ISBN 0-7858-1274-1
 * Flatheads, Knuckleheads, Panheads, Shovelheads | A Guide to Harley-Davidson Engines, Devitt Insurance, 2021.
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