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 Norton - 500 CS 1 first OHC
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Photo ou archives : F-M. Dumas
3802

Capacity : 500
Model : CS 1 first OHC
Production : 1928 - 1939
Category : (R) Racing

NORTON

500 CSl -1928

First of the cammy Nortons

Norton's new overhead-cam 500 made its racing debut in the 1927 Senior TI, a famous

victory because Alex Bennett won the race while Stanley Woods, the chief works rider, made the fastest lap (71 mph) before retiring with clutch trouble. Scarcely six months later, the works announced a client version, the CS1 (for "Cam Shaft One").

The Fastest 500 on the Market

Norton claimed the CS1 was the fastest production machine ava ilable in its category. It was a faithful copy of the works bike, which had been clocked at 93.7 mph in the Isle of Man. Designed by Walter Moore (who designed a similar power unit for NSU), the single-cylinder CS1 engine was a long-stroke unit with a single shaft-and-bevel-driven overhead-camshaft. Primary transmission was by chain to a Sturmey Archer racing gearbox.

New Cradle Frame

The powertrain was housed in a new cradle frame instead of the diamond frame used with the previous Norton pushrod engine. The CSl could be supplied with a touring gearbox, fitted with a kick-starter and solo or sidecar gear ratios as well as with a closeratio box and no kick-starter. The generous drum brakes were reputedly copied from those of the 1926 version of the Ford Model T. The dry-sump lubrication was supplied by a gear pump mounted beneath the lower driving bevels of the camshaft drive. The CS1 remained in production in this form until 1932, when it was replaced by a road-going version of the famous International (which, while it retained the CS1 designation, had an entirely different engine).

SPECIFICATIONS

Engine: 490cc (79xl00mm) air-cooled singlecylinder four-stroke; dry-sump lubrication; magneto ignition

Power Rating: 28 hp @ 5200 rpm

Valves: shaft-driven overhead-camshaft

Fuel System: carburetor

Transmission: 3-speed, chain final drive

Suspension: girder forks (front); rigid (rear)

Brakes: 7.9 inch drum (front & rea r)

Wheels: 20 inch wire (front & rea r)

Weight: 348 lb

Maximum Speed: 90 mph

 

The Norton 500cc CSJ was incontestably one of the greatest sport bikes oft be 1920s.




Le fichier Moto Passion réalisé par François-Marie Dumas réunit près de deux mille photos accompagnées d'un historique très complet des machines présentées.
Il sera progressivement mis à jour ici et toute information complémentaire est la bienvenue sur info@moto-collection.org.

Cette documentation unique, qui constitue sans doute l'encyclopédie la plus exhaustive jamais écrite sur l'histoire de la moto, a été réalisée avec l'assistance de nombreux spécialistes dont principalement Didier Ganneau, Christophe Gaime, Mick Woollett, Jean Goyard, Bernard Salvat, Christian Rey, Yves Campion, Helmut Krackowizer, Michael Dregni, Michel Montange, etc. que je remercie ici.

Disponible sur demande :
- Les fiches originales sur papier
- Les photos et archives signées de mon nom en haute définition ou les documents originaux.
Me contacter sur info@moto-collection.org pour les conditions et droits d'utilisation.