Benelli - 4 TNr Turismo
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Benelli D2-492-29-12
Photo ou archives : F-M. Dumas
2912

Capacity : 250
Model : 4 TNr Turismo
Production : 1933 -
Category : (R) Street Bike
   

BENELLI

250 4TNR Turlsmo - 1939

Racing technology over-the-counter

In 1927, the marque run by the six Benelli brothers achieved racing fame with a 175cc machine whose single overhead-camshaft was driven by a train of gears. Twin overhead-cams appeared on the works racers in 1930. Eventually, the displacement was increased to 250cc. Successive developments of this basic design were still racing in 1961!

Track-Bred Success

Racing success brought commercial success, and Benelli began marketing competitively priced roadsters closely based on their racing bikes and distinguished by the highly polished tubular housing for the vertical drive to the camshaft. They even built commercial-delivery tricycles powered by this prestigious engine, an extraordinary sight when most four-stroke engines on the market were rustic side-valve units.

An Outstanding Range

The Gran Sport 175 was intended for privateers, and Benelli began applying its fine technology to production bikes. In 1933, the company launched an overhead-cam 500 with a four-speed gearbox, followed in 1934 by a 250 with a four-speed hand-shift transmission. From 1936, customers had the option of rigid frames or Benelli's excellent swing arm rear suspension. This superb range of overhead-cam machines remained in production until1949. In 1941, the line-up consisted of no less than six 250s: the black-enameled 4TN Turismo with a choice of rigid or sprung frames (60-65 mph); the red-enameled Sport 4TS, again with or without rear springing (70-75 mph), the Sport 4TSSE (93 mph) and the 4TNF delivery trike.

SPECIFICATIONS

Engine: 246cc (67x70mm) air-cooled single-cylinder four-stroke, dry-sump lubrication

Power Rating: 10 hp @ 5500 rpm

Valves: overhead

Fuel System: carburetor

Transmission: 4-speed Benelli foot-shift gearbox; chain final drive

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

Brakes: drum (front & rear)

Wheels: 19 inch wire (front & rear)

Weight: 308 lb

Maximum Speed: 59 mph

Many manufacturers would have been proud to have such a competition-bred machine as this 250 Benelli Turismo in their catalogue.




Motorcycle encyclopedia Moto Passion, realised by François-Marie Dumas, include almost 2000 photos presented with an exhaustive history of the motorcycles exhibited.

This unique collection has been realised with the participation of many specialists. With many thanks in particular to Yves Campion, Michael Dregni, Didier Ganneau, Jean Goyard, Helmut Krackowizer, Michel Montange, Christian Rey, Bernard Salvat, Mick Woollett, etc

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