sentences:  All fell in the 15 CV fiscal horsepower category, sharing the six cylinder engine, which had overhead valves, hemispherical head, aluminium pistons, and four-bearing crankshaft.The performance was such in 1923, three tourers "put up a passable showing" at the first 24 Hours of Le Mans, leading to the creation for 1924 of the 15 Sport, with twin carburetion, larger valves, and Dewandre-Reprusseau servo-assisted four-wheel brakes (at a time when four-wheel brakes of any kind were a rarity); they ran second and third, and were comparable to the 3 litre Bentleys.The 15 CV Sport did better in 1925, winning Le Mans, followed home by a sister in third, while in 1926, Bloch and Rossignol won at an average 106 km/h (66 mph), leading a 1-2-3 sweep by Lorraines.