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The Armstrong Siddeley Long 17 was an automobile produced between 1935 and 1939. A total of 4,260 vehicles were produced (including the Short 17).

By the mid 1930's the side-valve engines had been developed as far as possible. In the search for new performance, an overhead valve 17HP model was produced to replace the 15HP. Drive was via a normal torque tube. Petrol consumption was around 19mpg.

The cars were fitted with a six-cylinder 2394cc engine that was rated at 17 hp. The engine had a bore/stroke of 67mm/114mm and produced a maximum quoted power output of 60 bhp at 3,300rpm. This have the Long 17 a maximum speed of 68 mph.

Body styles available included a saloon, tourer, atlanta, limousine, landaulette and sports Saloon. Initially, the gear change pedal was used as a clutch with a centrifugal clutch becoming available in 1937. In line with current practice, box section side rails were used for the chassis to increase stiffness. The Long 17 had a wheelbase of 9' 8"

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Armstrong Siddeley vehicles