1957 Norton Manx

1957 NORTON MANX BACKGROUND
The Norton Manx was developed in 1937, in both SOHC and DOHC form, to compete in and win the Isle of Man TT. Before fully developed, World War II intervened, and production of the Manx was delayed until 1946. The Manx quickly gained a reputation for its speed and reliability, allowing it to dominate the motorcycle Grand Prix racing and the Isle of Man TT for decades.

1957 NORTON MANX DESIGN
The Manx engine has an aluminum alloy cylinder block and head with a single overhead camshaft (SOHC) driven by a vertical shaft and bevel gears. They were hand assembled engines. The 1948 Norton Manx was the first to benefit from telescopic front forks and massive twin leading shoe (TLS) front brakes. 1949 was the first year for the Norton Manx Grand Prix models, purpose-built for road racing, and in 1950, they introduced the legendary “Featherbed Frame”. It was made of all-welded steel tubing instead of the common practice of heavy cast iron brazed lugs. It saved weight and made the bike lighter, and they handled like nothing else on the market. The 1953 Norton Manx was the last to use the ‘long-stroke’ engine, although it was a year of transition, so some early 1953s were the last of the long strokes, while the bulk of the model year’s production was dedicated to the new short stroke setup. This destroking too a major engine rework using a shorter stroke (86mm) and larger bore (85.6mm) making the ratio nearly “square”, and it would remain as such for the remainder of its production life in 1962.

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1957 Norton Manx SPECIFICATIONS

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Norton Motorcycles: From 1950 to 1986 (British Motor cycles since 1950)

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The Norton Commando Bible: All models 1968 to 1978

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Norton: The Complete History (Crowood MotoClassics)

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