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The ironhead was a Harley-Davidson motorcycle engine, so named because of the composition of the cylinder heads (Iron instead of Aluminium). The engine is a two-cylinder, two valves per cylinder, pushrod V-twin. It was produced from 1957 until 1985 and was replaced by the Evolution engine in 1986.
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.
1947 Harley-Davidson mod. WL 739 cc engine Harley-Davidson 45° V-twin, Sportster Evolution engine. Sportster motorcycles are powered by a four-stroke, 45° V-twin engine in which both connecting rods, of the "fork and blade" or "knife & fork" design, share a common crank pin.
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.
The engine design differed considerably from its predecessor the "Evo" although it shared some design elements with the Sportster line. The 88 represents the displacement in cubic inches of the standard engine. The bore is 3.75 in (95 mm) and the stroke is 4.00 in (102 mm), meaning the displacement is 88 cu in (1,450 cc).
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 engine is assisted by a 5-speed gearbox which transfers power through a toothed belt final drive. [1] XB9SX. Unlike the Buell XB12 series models introduced in 2004 which have a larger powerplant cubic capacity of 219 cc, the engine has a slightly shorter stroke. [2] This gives the XB9 a higher engine speed, approximately 1000 rpm higher.
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 ...