Harley-Davidson engine timeline

Harley-Davidson engines
Engine	1900s										1910s										1920s										1930s										1940s										1950s										1960s										1970s										1980s										1990s										2000s
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
Hummer																																																1947–1965
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–
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–
Water-cooled engines
Revolution																																																																	2002–
Revolution X																																																																	2013–

References

• Hornsby, Andy. "A Potted History of Harley-Davidson: Part 1 1903-1954". American V. Crewe, UK: American-V. Retrieved 2011-04-04. External link in |work= (help)
• 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