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The flathead engine saw service in Harley-Davidson motorcycles beginning with the Model WS flat-twin, produced from 1919 to 1923, [6] and continuing in 1924 with single-cylinder export-model 21-cubic-inch (340 cc) and 30.5-cubic-inch (500 cc) singles and continued in Servi-Cars until 1973. In the domestic U.S. market, the 45-cubic-inch (740 cc ...
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.
The Servi-Car used variations of Harley-Davidson's 45 cubic inch flathead. From 1932 to 36, the Servi-Car used the engine from the solo R model. [1] It was changed in 1937 to the engine used in the W model, which differed mainly in having a recirculating oil system instead of the constant-loss system of the R. [2] [7] The "W" flathead engine continued until the end of production in 1973 ...
The Harley-Davidson WLA is a Harley-Davidson motorcycle that was produced to US Army specifications in the years during and around World War II. It was based on an existing civilian model, the WL , and is of the 45 solo type, so called due to its 45-cubic-inch (740 cm 3 ) engine displacement and single-rider design.
The Model W engine was Harley-Davidson's first flathead engine, [7] and its transmission was the first in a Harley-Davidson motorcycle to be housed in the engine cases. [6] [8] The transmission included helical gear drive, a wet clutch, and a three-speed gearbox. [8] The engine was a stressed member of the frame. [9] [10]
A crossflow T-head sidevalve engine The usual L-head arrangement Pop-up pistons may be used to increase compression ratio Flathead with Ricardo's turbulent head. A flathead engine, also known as a sidevalve engine [1] [2] or valve-in-block engine, is an internal combustion engine with its poppet valves contained within the engine block, instead of in the cylinder head, as in an overhead valve ...
From the time Class C was established in 1938 until the 1953 KR, Harley-Davidson relied on the 27 hp (20 kW) WLDR, sold with lights, fenders and other equipment, intended to be ridden to the track by amateur racers, prepared by the rider and raced, [3] [8] and the race-only 1941-52 35 hp (26 kW) Harley-Davidson WR which was the direct ancestor ...
Harley-Davidson XA opposed-twin engine runs 100 °F (38 °C) cooler than a V-twin. [4]During WWII, the U.S. Army asked Harley-Davidson to design a specification of a motorcycle much like the BMWs used by German forces, with shaft drive, a boxer engine, and several other features that made the BMWs exceptionally reliable and low-maintenance machines.