Competition
Delage entered the 1911 Coupe de l'Auto at Boulogne with a 50 hp-metric 2996 cc (80 by) four with two 60 mm-diameter bellcrank-operated valves per cylinder controlled by camshafts in the crankcase.[5] The five-speed gearbox gave a top speed of 60 mph, and the four voiturettes each carried 26 impgal, as the factory planned for a no-stop race. Works driver Paul Bablot won, at an average 55.2 mph, with a 1m 11s over Boillot's Peugeot, followed home by Thomas in a second Delage; Delage also took the team prize.[5]
Delage moved up to Grand Prix racing in 1912, with a Léon Michelat-designed car powered by a four-valve 6235 cc (105 by) four-cylinder of 118 hp-metric, coupled again to a five-speed gearbox and fitted this time with 43 impgal.[5] Three cars were built for the 569 mi Amiens Grand Prix, though only two, Bablot's and Guyot's, actually entered.[5] On the day, Bablot's Delage proved the fastest car in the field, turning in a lap at 76.6 mph, but Guyot fell out of the lead with a puncture, and the race went to Peugeot, while the Delages were fourth and fifth.[5] At the French Grand Prix, Delage put Bablot first, Guyot second, ahead of Pilette's 1908 Mercedes GP car, Salzer in a Mercedes,[11] with Duray coming in fifth in the third Delage.[5]
In 1913, the new type Y set the fastest lap time at the French Grand Prix at Le Mans, and in 1914, this same car won the 1914 Indianapolis 500 with René Thomas at the wheel. Thomas, Guyot, and Duray returned to the French Grand Prix with 4½-liter twin-cam desmodromic valved racers featuring twin carburettors, five-speed gearbox, and four-wheel brakes.[5] While quick, they proved unreliable; only one finished, Duray's, in eighth.[5]
In 1914, Delage emphasized its focus on competition by creating the type O Lyon Grand Prix, while at the same time moving towards the luxury car market with 6 cylinders of a large class. However, racing was severely curtailed during World War One.
In 1923, Louis Delage returned to competition with the innovative 12-cylinder 2-liter type 2 LCV. This car won the 1924 European Grand Prix in Lyon and the 1925 Grand Prix of ACF Montlhéry. The 12-cylinder DH (10.5 liters) of 1924 beat the world speed record on the highway, at 230 km/h. A Delage 155 B won the first Grand Prix of Great-Britain in 1926, driven by Louis Wagner and Robert Senechal. The production of cars continued with the DI and the DI S SS. The DM evolved into the DMS and DML, equipped with a 6-cylinder 3-liter engine designed by Maurice Gaultier.
Delage's Grand Prix effort saw a Plancton-designed 1984 cc (51.3 by) four overhead cam V12.[12] The 110 hp car, driven by Thomas, fell out of the French Grand Prix in 1923, but went on to perform well for the bulk of the 1923 and 1924 season.[9] With supercharger added in 1925, bringing output to 195 hp, it won at Montlhéry and Lasarte,[9] proving as fast as the Alfa Romeo P2, but rarely racing it directly.[9] This car was supplanted in 1926 by a Lory-designed supercharged 1.5-liter twincam straight eight of 170 hp-metric; capable of 130 mph, it was the company's last Grand Prix entrant.[9]
Always passionate about racing, Louis Delage designed an 8-cylinder 1500 cc, the type 15 S 8. This car won four European Grands Prix races in 1927, and won Delage the title "World Champion of Car Builders" that same year.
A 2988 cc-powered D6 won the 1938 Tourist Trophy at Donington Park and came second at Le Mans.[9] A single V12-powered car, intended for Le Mans, caught fire at the 1938 International Trophy at Brooklands.[9]
Postwar, the best results Delage had were seconds at the 1949 Le Mans and 1950 Paris Grand Prix.[9]