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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.
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 ...
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.
CVO models are produced in Harley-Davidson's York, Pennsylvania plant, where touring and Softail models are also manufactured. In each model year, CVO models feature larger-displacement engines than the mainstream models, and these larger-displacement engines make their way into the normal "big twin" line within a few years when CVO models are again upgraded.
The engine design was borrowed from Harley's Evolution Sportster engine with the rear cylinder eliminated. [ 1 ] [ 2 ] The plastic bodywork pieces of the Blast were made from Surlyn , a substance used to make the outside of golf balls, to protect the surfaces when the Blast is dropped, and the color is molded-in. [ 2 ]
KH-series: K series, same bore but longer stroke. XL, Ironhead 53.9 cu in (883 cc), 61 cu in (1,000 cc) (1972–1985) 1957–1985 The first year of Sportster, a development of the KH with overhead-valve engines and cast iron heads. The engine was updated after 29 years. [3] XR-750: 46 cu in (750 cc) 1970–1985