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240 Landmarks TopGasoline and Natural Gas Engine > Mazda SCS engine (TC)
 Mazda SCS engine (TC)
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・ In this engine, the conventional Mazda lean burn system based on induction swirl was combined with a carburetor that was developed based on the innovative idea of EGR introduction. This reduced NOx and achieved air-fuel ratio automatic correction control.
・The EGR was performed by two systems to recirculate gas to the intake system. Upstream EGR was mixed with the air bypassing the carburetor venturi, and then the air-fuel ratio was automatically corrected on EGR.
・It won the Science and Technology Agency Director-General's Award and the JSME Award as an exhaust gas system that conformed to the 1978 regulations due to its excellent fuel efficiency.
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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:1977
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Manufacturer:Toyo Kogyo Co., Ltd.
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Classification:Design drawings, literature
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Current status:Open to the public
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Model / Manufacture
Model:TC
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Type:Gasoline
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Company name:Mazda Motor Corporation
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Familiar name:Mazda SCS engine
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Installation model:Mazda Familia AP
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Year of manufacture:1977
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Specification
Cylinder arrangement, number of cylinders:Inline 4-cylinder
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Cycle / cooling method:4/
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Valve type / number:SOHC, 2-valve/cylinder
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Combustion method:Lean burn
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Combustion chamber:Multispherical combustion chamber
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Total displacement:1272 cc
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Bore x stroke:73.0×76.0 mm
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Compression ratio:9.2
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Mass (weight):127 kg
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Dimensions:570×620×635 mm
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Ignition system:Ignition type
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Performance
Max. output:70 ps/5500 rpm
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Max. torque:10.4 kgm/3500 rpm
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Rate of fuel consumption:220 g/psh (3000 rpm)
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Device
Intake system:Naturally aspirated
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Points of interest, topicality:For this engine, a carburetor with an automatic air-fuel ratio correction that allows the A/F and EGR to be changed in accordance with each other was developed and adopted. This advanced technology enabled it to conform to the emission gas regulations of 1978.
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Features:The Mazda Stable Combustion System (SCS) realized improved fuel economy and low emissions by combining a swirl lean burn system and a new carburetor with automatic air-fuel ratio correction.
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Reference materials:(1) Nainen Kikan Vol. 24, No. 313 (Dec. 1985), pp. 11-12
(2) Mazda PR document "The 30th Anniversary of Familia"(Jun. 1994)
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