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 MV Agusta - 350 Grand Prix prototype DOHC
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Photo ou archives : F-M. Dumas

Capacity : 350
Model : Grand Prix prototype DOHC
Production : 1957 - 1957
Category : (R) Racing


350 twin Grand Prix -1957

Aeronautical techniques

Though the .MV Agusta marque - 37 times world champion - is justly famed for its four- and six-cylinder 350 and 500 Grand Prix racers and its 125 and 175 singles, Count Agusta's firm nevertheless tried its hand with other configurations, like this unorthodox

twin built in 1957.

Alternative project

The first MV Agusta 350cc four cylinders of 1953 developed 40 hp at 10,500 rpm, but it

wasn't until 1958 that John Surtees brought the marque its first 350cc world championship. In the meantime, the factory had developed several possible alternatives, like this highly original twin with its trellis frame drawing on techniques used in aeronautics and Formula 1 race car chassis. This extremely light and rigid triangulated

structure was constructed from small section tubes. Easily dismounted, the suspended engine contributed to the rigidity, while the Earles front fork employed a similar construction technique to the frame.

A Magnificent Engine

As for the engine, it was derived from a touring 300cc unit designed by the engineer

Giannini in 1955, which developed 20 hp at 8,000 rpm but which had never passed the prototype stage. Considerably lightened, the 350cc racing version was distinguished by its twin external-inertia flywheels. It was a layout that allowed an excessively compact engine; its inclined cylinders were topped by cylinder heads with ample radial cooling fins.


Engine: 349cc (67x58mm) air-cooled 45- degree incl ined twin-cylinder four-stroke; magneto ignition; dry sump lubrication

Power Rating: 47 hp @ 12,000 rpm

Valves: twin overhead camshafts driven by gear train cascade of pinions; 3 valves/ cylinder

Fuel System: two 29mm carburetors

Transmission: 5-speed

Suspension: Earles (front); swinging forks with twin suspension units (rear)

Brakes: 9 in (front); drum (rear)

Wheels: 3.00x19 inch (front); 4.00x19 inch (rear)

Weight: 291 lb


MV Agusta eventually preferred the power of a four-cylinder engine to the maneuverability of this masterful twin.

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.