Harley-Davidson engine timeline

From Wikipedia, the free encyclopedia

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 in several locations globally, including York, Pennsylvania; Milwaukee, Wisconsin; Kansas City, Missouri (closing); Manaus, Brazil; and Bawal, India.

The Harley Family 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 roughly on the recently 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[edit]

Harley-Davidson engines
Engine 1900s 1910s 1920s 1930s 1940s 1950s 1960s 1970s 1980s 1990s 2000s 2010s
Light engines
S 1948–1952
One-cylinder engines
27.4" F-head 1903–1905
26.8" F-head 1906–1908
30" F-head 1909–1912
35" F-head 1913–1918
37" F-head 1921–1923
21" OHV 1926–1929
21" flathead 1926–1934
30.5" flathead 1929–1934
"Hummers" 1948–1966
Topper 1960–1965
Baja 100 1969–1972
Big twin engines
F-head (IOE) 1914–1929
Flathead 1930–1948 (until 1973 in the servicar models)
Knucklehead 1936–1947
Panhead 1948–1965
Shovelhead 1966–1984
Evolution 1984–1999
Twin Cam 1999–2017
Milwaukee-Eight 2017-
Sport engines
W (opposed) 1919–1923
XA 1942
D 1929–1931
R 1932–1936
W (V twin) 1937–1952
G (W engine) 1937–1973
WR 1941–1952
K 1952–1953
KH 1954–1956
KR 1952–1969
Ironhead 1957–1985
XR 1970–
Evolution 1986–
Fluid (water)-cooled engines
Revolution 2002–2017
Revolution X 2013–

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)

  • Hornsby, Andy. "A Potted History of Harley-Davidson: Part 1 1903-1954". Crewe, UK: American-V. Archived from the original on 2011-02-11. Retrieved 2011-04-04.
  • Mitchell, D., ed. (1997). Harley-Davidson Chronicle - An American Original. Publications International Limited. ISBN 0-7853-2514-X.
  • 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.