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The engine is a two-cylinder, two-valve-per-cylinder, pushrod V-twin, made in both 61 c.i. (EL) and 74 c.i. (FL, FLH) displacements. The Panhead engine replaced the Knucklehead engine in 1948 and was manufactured until 1965 when it was replaced by the Shovelhead.
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 ...
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 ...
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.
The U continued to be produced in varying configurations as a 74 cubic inch U & UL (1937 to 1948), and 80 cubic inch UH & ULH engine (1937 to 1941). By 1948, the first year of the aluminum-head Panhead, it had been thoroughly superseded and outsold in the marketplace by the superior performance of the overhead valve model Big Twins.
Engine Years Notes Model 125 125 cc (7.6 cu in) two-stroke single 1948–1952 Copy of DKW RT 125 given to Harley-Davidson as war reparations. More than ten thousand were sold in the first year of production. Model 165 165 cc (10.1 cu in) two-stroke single 1953–1959 Replacement for the Model 125, with larger engine. Hummer
Model K and KK 1952–1953: 750 cc side-valve engines, using the 45 model bore and stroke of 2.75" x 3.8125" (69.85 x 96.85 mm) Model KR (racing only) 1953–1969: 750 cc side-valve engines; Model KH and KHK 1954–1956: 888 cc side-valve engines, using the 45 model bore, but with the stroke increased to 4.5625" (115.89 mm).
An undisclosed number of samples of engines failed, until an engine successfully passed the 500-hour nonstop run. This was the benchmark for the engineers to approve the start of production for the Revolution engine, which was documented in the Discovery channel special Harley-Davidson: Birth of the V-Rod , October 14, 2001.