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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 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 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 engine of the WLA is a side-valve design, which is reliable though not particularly efficient in comparison to overhead-valve designs. Harley-Davidson already had overhead valve engines in production for its Big Twin lines, but the "small twin" flathead design was popular in applications needing low cost and reliability more than power.
The engine is a two-cylinder, 45 degree, pushrod actuated overhead valve V-twin engine with two valves per cylinder. It was the third basic type of V-Twin engine used by Harley-Davidson, replacing the Flathead-engined VL model in 1936 as HD's top-of-the-line model. The engine was manufactured until 1947 and was replaced by the Panhead engine in ...
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 ...
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