The most prominent 4-rotor engine from Mazda, the 26B, was used only in various Mazda-built sports prototype cars including the 767 and 787B in replacement of the older 13J. In 1991 the 26B-powered Mazda 787B became the first Japanese car and the first car with anything other than a reciprocating piston engine to win the 24 Hours of Le Mans race outright. The 26B engine displaced per set of four chambers (counting only one chamber for each of the four rotors) – thus the "26" in the series name suggesting 2.6 litres – and developed at 9000 rpm. The engine design uses peripheral intake ports, continually variable geometry intakes, and an additional (third) spark plug per rotor.