10A Rotary Engine

In 1967, Toyo Kogyo (currently MAZDA Motor Corporation) released its ‘Cosmo Sport,’ powered by two rotary engines, for the first time in the world. The adopted engine is the 10A rotary engine, which was epoch-making and opened a new chapter in the history of the internal combustion engine. The new ‘apex seal’ technology was manufactured by impregnating high-strength carbon material or pyrolytic graphite with aluminum, which prevented wavy wear on the internal surface of the rotor housing, thereby achieving high durability that can withstand a traveling distance of 100,000 km. The side intake port and the 2-stage, 4-barrel carburetor always ensure a stable air– fuel mixture, and efficient combustion is achieved by adopting two ignition plugs for each rotor, thereby producing a high output of 110 PS/7,000 rpm from its compact profile.

On exhibition (Reservation required)

Mazda Museum

Hours open:
8:30–15:30; vary depending on season
Admission fee:
Days closed:
Saturdays, Sundays, public holidays, Mazda’s holidays
3-1 Shinchi, Fuchu-cho, Aki-gun, Hiroshima 730-8670
By JR, take Sanyo Line to Mukainada Sta. About 5 mins. on foot. Reception on 1F of Mazda head office bldg. By chartered bus (group reservation). Entry from east main gate of Mazda Uzina, Reception at Mazda Museum

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