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The knucklehead is a retronym used by enthusiasts to refer to a Harley-Davidson motorcycle engine, so named because of the distinct shape of the rocker boxes. [1] The engine is a two-cylinder, 45 degree, pushrod actuated overhead valve V-twin engine with two valves per cylinder.
The Harley-Davidson RL 45 is a model of the R-series range produced from 1932 to 1936, preceded by the DL range (1929–1931), which was Harley-Davidson's first 45 cubic-inch and first flathead V-twin motorcycle, and succeeded in 1937 by the WL. The R-series range included 45-solo, R, RL and RLD models.
In April 2004 alone, the price of HOG shares dropped from more than $60 to less than $40. ... Knucklehead, 1936–1947 61 cubic inch (1,000 cc), ...
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 ...
W : the W family of motorcycles. Harley-Davidson (except in very early models) gives a letter designation for each model family. The W series at the time was the newest incarnation of the 45-cubic-inch (740 cm 3) flathead motor, and was developed from the earlier R family 1932–1936. L : "high compression", in the usual HD scheme.
In 1937, that engine was redesigned to include a recirculating lubrication system, and designated the model U, and it went into the same frame and running gear configuration as the model E Knucklehead, which had originated in 1936. The U continued to be produced in varying configurations as a 74 cubic inch U & UL (1937 to 1948), and 80 cubic ...
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The V2 engine introduced in 1948, colloquially called Panhead, was available as E, EL, F, FL depending on size and compression 2019 Harley Davidson FLHT. Harley-Davidson FL is a model designation used for Harley-Davidson motorcycles since 1941, when F referred to the new large capacity 74 cui (1200cc) variant of the V-2 Overhead valve engine (″Knucklehead″) that was introduced in 1936 as ...