Internal Combustion Engine Cars
Already by 1889, de Dion was becoming convinced the future lay in the internal combustion engine, and the company had even built a ten-cylinder two-row rotary. After Trépardoux resigned in 1894, the company became De Dion, Bouton et Compagnie. For 1895, Bouton created a new 137 cc (8.4 in3) one-cylinder engine with trembler coil ignition. Proving troublesome at its designed speed of 900 rpm (throwing bearings and running rough), when Bouton increased the revs, the problems vanished; in trials, it hit an unheard of 3500 rpm, and was usually run at 2,000 rpm, a limit imposed by its atmospheric valves and surface carburettor. Both inlet and exhaust valves were overhead and a flywheel was fitted to each end of the crankshaft.
This engine was fitted behind the rear axle of a tricycle frame bought in from Decauville, fitted with the new Michelin pneumatic tires. It showed superb performance, and went on the market in 1896 with the engine enlarged to 1¼ CV (Horsepower) (932 W) 185 cc (11.3 cu in), with 1¾ CV (1.3 kW) in 1897. By the time production of the petite voiture tricar stopped in 1901, it had 2¾ CV (2 kW), while racers had as much as 8 CV (6 kW).
In 1898, Louis Renault had a De Dion-Bouton modified with fixed drive shaft and ring and pinion gear, making "perhaps the first hot rod in history". The same year, the tricar was joined by a four-wheeler and in 1900 by a vis a vis voiturette, the Model D, with its 3¾ CV (2.8 kW) 402 cc (24.5 cu in) single-cylinder engine under the seat and drive to the rear wheels through a two speed gearbox. This curious design had the passenger facing the driver, who sat in the rear seat. The voiturette had one inestimable advantage: the expanding clutches of the gearbox were operated by a lever on the steering column. The Model D was developed through Models E, G, I, and J, with 6 CV (4.5 kW) by 1902, when the 8 CV (6 kW) Model K rear-entry phaeton appeared, with front-end styling resembling the contemporary Renault. Until World War I, De Dion-Boutons had an unusual decelerator pedal which reduced engine speed and ultimately applied a transmission brake. In 1902, the Model O introduced three speeds, which was standard for all De Dion-Boutons in 1904.
A small number of electric cars were also made in 1901.
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