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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 Revolution engine is a liquid-cooled, double overhead camshaft, four valve per cylinder, electronic fuel injected, internally counterbalanced 60 degree V-twin engine with a displacement of 1,131 cc (69.0 cu in), producing a claimed 115 horsepower (86 kW) at 8,250 rpm at the crankshaft, with a redline of 9,000 rpm.
Harley-Davidson Evolution engine at the Harley-Davidson Museum. The Evolution engine (popularly known as Evo and sometimes as Blockhead ) is an air-cooled, 45-degree, V-twin engine manufactured from 1984 by Harley-Davidson for the company's motorcycles.
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.
Motorcycles with a V-twin engine mounted with its crankshaft mounted in line with the frame, e.g. the Honda CX series, are said to have "transverse" engines, [1] [2] while motorcycles with a V-twin mounted with its crankshaft mounted perpendicular to the frame, e.g. most Harley-Davidsons, are said to have "longitudinal" engines.
The Tri Glide is powered by a 114 cu in (1,870 cc) overhead valve V-twin engine that produces a claimed 120 ft lbs of torque and 93 rear wheel horsepower, and is equipped with a six speed transmission. [1] The engine has electronic fuel injection. [7]
This gave the new engine an extra 10 horsepower, along with a different appearance. [1] The engine gained the nickname “Shovelhead” because its rocker covers look a little bit like an upside-down coal shovel. [2] While the engine did have problems, it gave Harley-Davidson a 26% sales increase during the early part of its timeline. [3]