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240 Landmarks of Japanese Automotive Technology
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240 Landmarks TopGasoline and Natural Gas Engine > Rotary engine 10A type
 Rotary engine 10A type
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・ This was an innovative engine that came into practical use through technical cooperation with the German company NSU Wankel. It was the world's first 2-rotor type rotary engine.
・The issue of chatter marks generated in the peripheral housing was solved by using carbon apex seals.
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Storage location:MAZDA MOTOR CORPORATION (3-1, Shinchi, Fuchu-cho, Aki-gun, Hiroshima 730-8670)
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Year manufactured:1967
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Manufacturer:Toyo Kogyo Co., Ltd.
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Classification:Mass-production product
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Current status:On display (static): open to the public
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Model / Manufacture
Model:10A
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Type:Gasoline
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Company name:Mazda Motor Corporation
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Location:Mazda Motor Corporation
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Installation model:Mazda Cosmo Sports
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Year of manufacture:1967
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Designed by:Kenichi Yamamoto
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Specification
Cylinder arrangement, number of cylinders:Inline 2-rotor
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Cycle / cooling method:4/forced circulation
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Combustion chamber:Bathtub
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Total displacement:491x2 cc
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Compression ratio:9.4
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Mass (weight):102 kg
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Dimensions:51×59.5×54.5cm
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Ignition system:Battery coil type
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Radiator type:Pressure water tube type
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Performance
Max. output:110 ps/7000 rpm
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Max. torque:13.3 kg-m/3500 rpm
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Rate of fuel consumption:235 gr/ps-h
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Device
Intake system:Side port
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Exhaust system:Peripheral port
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Points of interest, topicality:The world's first 2-rotor rotary engine for automobiles
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Features:Low vibration due to less reciprocating motion. Light and compact structure without valve train. Flat torque characteristics due to combustion on every rotation of the output shaft.
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Reference materials:(1) "Rotary Engine", Kenichi Yamamoto ed. (2) "COSMO SPORT No Shoukai", 1967, Toyo Kogyo Co., Ltd.
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