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. 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 1948. The Knucklehead-engined models were originally referred to as "OHVs" by enthusiasts of the time and in Harley's official literature; the nickname arose from the California chopper culture of the late 1960s.
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| - Harley-Davidson Knucklehead (fr)
- Harley-Davidson Knucklehead engine (en)
- Harley-Davidson Knucklehead (it)
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| - Le moteur Knucklehead est un surnom utilisé par les amateurs référant à un type de moteur Harley-Davidson, ainsi nommé en raison de la forme distincte de ses cache-culbuteurs . (fr)
- 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. 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 1948. The Knucklehead-engined models were originally referred to as "OHVs" by enthusiasts of the time and in Harley's official literature; the nickname arose from the California chopper culture of the late 1960s. (en)
- Il Knucklehead era un motore prodotto dalla Harley-Davidson dal 1936 al 1947, allorquando venne sostituito dal più moderno propulsore Panhead; il nome del motore deriva dalla particolare forma dei coperchi delle valvole (knuckle = nocca delle dita). (it)
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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. 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 1948. The Knucklehead-engined models were originally referred to as "OHVs" by enthusiasts of the time and in Harley's official literature; the nickname arose from the California chopper culture of the late 1960s. As the design of Harley-Davidson engines has evolved through the years, the distinctive shape of the valve covers has allowed Harley enthusiasts to classify an engine simply by looking at the shape of the cover. The knucklehead engine valve covers have contours resembling knuckles on a person's fist that give the knucklehead its name. (en)
- Il Knucklehead era un motore prodotto dalla Harley-Davidson dal 1936 al 1947, allorquando venne sostituito dal più moderno propulsore Panhead; il nome del motore deriva dalla particolare forma dei coperchi delle valvole (knuckle = nocca delle dita). Il propulsore venne introdotto prima della seconda guerra mondiale, in un periodo in cui il florido mercato americano della motociclietta era ormai pressoché suddiviso tra Harley-Davidson e Indian: la nascita del Knuckle è legata alla necessità di allargare la gamma HD di quegli anni con un motore bicilindrico di grossa cilindrata, buone prestazioni ed affidabilità, che si affiancasse alla gamma di motori a valvole laterali, e quindi con una concezione ormai superata e minore potenza, denominati Flathead. (it)
- Le moteur Knucklehead est un surnom utilisé par les amateurs référant à un type de moteur Harley-Davidson, ainsi nommé en raison de la forme distincte de ses cache-culbuteurs . (fr)
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