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The Voisin C4 was an automobile built between 1922 and 1926.

The C4 was the smallest sleeve valve Voisin, its entire chassis was shorter than the wheelbase of the V12 C2 prototype with which it shared the company's stand at the 1922 Paris Motor Show.

The saloon version had an uncompromisingly functional angular body, but the model was also offered with attractive four-seater torpedo coachwork. Few changes were made for the 1923 model year, apart from minor cosmetic improvements and a two horsepower increase in output. Front wheel brakes were offered as an option and sports torpedo and coupé de ville variants were added to the range. The C4 also had a number of regional competition successes.

C4S

In 1924, the C4S was introduced.

It's larger 1,328cc engine increased the power output by 10% to 33 bhp. Front wheel brakes came as standard equipment and starting the engine was rendered noiseless by the fitment of a Dynastar dynamo/starter motor to the front of the crankshaft. Changes to the styling and interior, together with a new sports torpedo body, completed the transformation.

Minor bodywork changes were introduced for 1925, the model's final year of production.