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The Evolution Big Twin saw a fifteen-year run in Harley-Davidson's Dyna, Softail, FXR, and Touring frames, although a limited number of Evolutions were used in the 2000 model year CVO FXR4, and 1999 FXR2 and FXR3 models. While the main case was only slightly modified from the previous Shovelhead engine, the top end was significantly improved.
The Shovelhead engine was ultimately fitted to all of Harley-Davidson's big twin motorcycles throughout its production. The engines were first met with controversy due to the Shovelhead's weight and ground clearance. Because of this steering and weaving became a new issue that arose with motorcycles fitted with the engine.
Harley-Davidson Twin Cam engine at the Harley-Davidson Museum. The Harley-Davidson Twin Cam are motorcycle engines made by Harley-Davidson from 1998 to 2017. Although these engines differed significantly from the Evolution engine, which in turn was derived from the series of single camshaft, overhead valve motors that were first released in 1936, they share a number of characteristics with ...
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 ...
The Harley-Davidson Milwaukee-Eight engine is the ninth generation of "big twin" engines developed by the company, but only Harley's fourth all-new Big Twin in 80 years, first introduced in 2016. These engines differ from the traditional Harley Big Twin engines in that there are four valves per cylinder, totaling eight valves, hence the name.
S&S and V-Twin Manufacturing are the only motorcycle companies in the world to manufacture Knucklehead, Shovelhead, Panhead, Evolution-style engines and Twin-cam style engines. S&S manufactures the largest (143 cu in (2,340 cc)) engine to fit a stock Harley-Davidson frame.