Daewoo S-TEC engine

S-TEC or M-TEC is a low-displacement engine range co-developed by Suzuki and Daewoo Motors for use in micro- and subcompact cars.

Daewoo S-TEC engine
Overview
ManufacturerDaewoo Motors (1991-2002)
General Motors (2002-present)
Also called
  • M-TEC
  • P-TEC
  • SMARTECH II
Production1991-present
Layout
ConfigurationInline-3, Inline-4
Displacement
  • 0.8 L (796 cc)
  • 1.0 L (995 cc)
  • 1.2 L (1,150 cc)
  • 1.2 L (1,199 cc)
  • 1.2 L (1,206 cc)
  • 1.2 L (1,249 cc)
  • 1.4 L (1,399 cc)
  • 1.5 L (1,451 cc)
  • 1.5 L (1,485 cc)
Cylinder bore
  • 68.5 mm (2.70 in)
  • 69.7 mm (2.74 in)
  • 70.5 mm (2.78 in)
  • 74.71 mm (2.94 in)
Piston stroke
  • 67.5 mm (2.66 in)
  • 72 mm (2.83 in)
  • 78 mm (3.07 in)
  • 79 mm (3.11 in)
  • 80 mm (3.15 in)
  • 84.7 mm (3.33 in)
Block materialCast iron
Head materialAluminum
Valvetrain
Compression ratio9.3:1, 9.5:1, 9.8:1, 10.2:1, 10.5:1
Combustion
TurbochargerMitsubishi Heavy Industries one-stage single-scroll (Daewoo S-TEC III LL5 versions)
Fuel systemFuel injection
Fuel type
Oil systemWet sump
Cooling systemWater-cooled
Output
Power output36–110 kW (49–150 PS; 48–148 hp)
Torque output71.5–230 N⋅m (52.7–169.6 lb⋅ft)
Emissions
Emissions control technologyEGR
Chronology
SuccessorSmall Gasoline Engine

S-TEC

The first model was 0.8 L (796 cc) SOHC straight-three engine based on the powerplant of the Suzuki Alto.

In 2002, the range was extended to 1.0 L (995 cc) and 1.2 L (1,150 cc) inline-four engines and updated with EGR valve to reduce emission. A new engine plant for the updated model T4 was built. The 1.0 version is used in Chevrolet Matiz and the 1.2 in the European Chevrolet Kalos.

In 2004 the 0.8 and 1.0 engines were updated again. New intake and exhaust systems, along with low-friction aluminum cam followers with rollers were added, resulting in better economy.

DisplacementBoreStrokeCompression RatioPowerTorque
0.8 L (796 cc)68.5 mm (2.70 in)72 mm (2.83 in)36 kW (49 PS; 48 hp)
at 6000 rpm		71.5 N⋅m (52.7 lb⋅ft)
at 4000 rpm
1.0 L (995 cc)67.5 mm (2.66 in)9.3:148.5 kW (66 PS; 65 hp)
at 5400 rpm		91 N⋅m (67 lb⋅ft)
at 4200 rpm
1.2 L (1,150 cc)78 mm (3.07 in)53 kW (72 PS; 71 hp)
at 5400 rpm		104 N⋅m (77 lb⋅ft)
at 4400 rpm

Applications:

S-TEC II

For 2008, a new 1.2 L (1,206 cc) version dubbed S-TEC II is introduced with the new Chevrolet Aveo hatchback; new features include chain-driven 16-valve DOHC valvetrain and variable intake geometry. The 1.0 L version has been introduced with the 2010 Chevrolet Spark. A 1.2 L LPG/gasoline version was developed exclusively for the India market; called SMARTECH II and used in the 2010 Chevrolet Beat. Introduced in 2013, the 1.2 L version is available in the United States version of the Chevrolet Spark.

NameDisplacementBoreStrokeCompression RatioPowerTorque
1.0 L (995 cc)68.5 mm (2.70 in)67.5 mm (2.66 in)9.8:150 kW (68 PS; 67 hp)
at 6400 rpm		93 N⋅m (69 lb⋅ft)
at 4800 rpm
LMU1.2 L (1,206 cc)69.7 mm (2.74 in)79 mm (3.11 in)10.5:162 kW (84 PS; 83 hp)
at 6000 rpm		114 N⋅m (84 lb⋅ft)
at 3800-4400 rpm
LMH1.2 L9.8:160 kW (82 PS; 80 hp)
at 6400 rpm		111 N⋅m (82 lb⋅ft)
at 4800 rpm
1.2 L (1,199 cc)
  • 80.5 PS (59.2 kW; 79.4 hp)
    at 6200 rpm (Gasoline)
  • 80.04 PS (58.87 kW; 78.95 hp)
    at 6400 rpm (LPG)
  • 108 N⋅m (80 lb⋅ft)
    at 4400 rpm (Gasoline)
  • 104 N⋅m (77 lb⋅ft)
    at 4400 rpm (LPG)
LL01.2 L (1,249 cc)70.5 mm (2.78 in)80 mm (3.15 in)10.5:162.66 kW (85 PS; 84 hp)
at 6400 rpm		112.05 N⋅m (82.64 lb⋅ft)
at 6400 rpm

Applications:

S-TEC III
NameDisplacementBoreStrokeCompression RatioPowerTorque
LCU1.4 L (1,399 cc)10.2:1 76 kW (103 PS; 102 hp)
at 6000 rpm		131 N⋅m (97 lb⋅ft)
at 4200 rpm
L2B1.5 L (1,485 cc)74.7 mm (2.94 in)84.7 mm (3.33 in)10.2:185 kW (116 PS; 114 hp)
at 6000 rpm		144 N⋅m (106 lb⋅ft)
at 3800 rpm
LJO1.5 L (1,451 cc) T9.5:1110 kW (150 PS; 148 hp)
at 5500 rpm

230 N⋅m (170 lb⋅ft)
at 2000-3800 rpm

1.4 L applications:

1.5 L applications:

NOTE: Some horsepower and torque number have small differences on different models.

See also

References
  1. https://wuling.id/en/formo
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