| Daewoo S-TEC engine | |
| Manufacturer: | Daewoo Motors (1991-2002) General Motors (2002-present) |
| Production: | 1991-present |
| Successor: | Small Gasoline Engine |
| Configuration: | Inline-3, Inline-4 |
| Block: | Cast iron |
| Head: | Aluminum |
| Turbocharger: | Mitsubishi Heavy Industries one-stage single-scroll (Daewoo S-TEC III LL5 versions) |
| Fuelsystem: | Fuel injection |
| Oilsystem: | Wet sump |
| Coolingsystem: | Water-cooled |
| Power: | NaNabbr=onNaNabbr=on |
| Torque: | NaNNm |
| Emissions Control: | EGR |
| Compression: | 9.3:1, 9.5:1, 9.8:1, 10.2:1, 10.5:1 |
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. The original version was a license-built version of the Suzuki F8B engine; later generations were derived from the original design in South Korea.
The first model was 796cc SOHC straight-three engine based on the powertrain of the Suzuki Alto.
In 2002, the range was extended to 995cc and 1150cc 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.
| Cylinders | Displacement | Bore | Stroke | Compression Ratio | Power | Torque |
|---|---|---|---|---|---|---|
| I3 | 796cc | 68.52NaN2 | 722NaN2 | 36abbr=onNaNabbr=on at 6000 rpm | 71.5Nm at 4000 rpm | |
| I4 | 995cc | 67.52NaN2 | 9.3:1 | 48.5abbr=onNaNabbr=on at 5400 rpm | 910NaN0 at 4200 rpm | |
| I4 | 1150cc | 782NaN2 | 53abbr=onNaNabbr=on at 5400 rpm | 1040NaN0 at 4400 rpm |
Applications:
For 2008, a new 1206cc 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.
| Name | Displacement | Bore | Stroke | Compression Ratio | Power | Torque | |
|---|---|---|---|---|---|---|---|
| 995cc | 68.5mm | 67.5mm | 9.8:1 | 50abbr=onNaNabbr=on at 6400 rpm | 930NaN0 at 4800 rpm | ||
| LMU | 1206cc | 69.72NaN2 | 792NaN2 | 10.5:1 | 62abbr=onNaNabbr=on at 6000 rpm | 1140NaN0 at 3800-4400 rpm | |
| LKY | 1.2 L | 9.8:1 | 60abbr=onNaNabbr=on at 6400 rpm | 1110NaN0 at 4800 rpm | |||
| 1199cc | |||||||
| LL0 | 1249cc | 70.52NaN2 | 802NaN2 | 10.5:1 | 62.66abbr=onNaNabbr=on at 6400 rpm | 112.05Nm at 6400 rpm |
Applications:
| Name | Displacement | Bore | Stroke | Compression Ratio | Power | Torque | ||
|---|---|---|---|---|---|---|---|---|
| LCU | 1399cc | 10.2:1 | 760NaN0 at 6000 rpm | 1310NaN0 at 4200 rpm | ||||
| L2B | 1485cc | 74.7abbr=onNaNabbr=on | 84.72NaN2 | 10.2:1 | 85abbr=onNaNabbr=on at 6000 rpm | 1440NaN0 at 3800 rpm | ||
| LJO | 1451cc T | 73.8abbr=onNaNabbr=on | 84.72NaN2 | 9.8:1 | 1080NaN0 at 5500 rpm | 2500NaN0 at 2000-3800 rpm |
1.4 L applications:
NOTE: Some horsepower and torque number have small differences on different models.