S-TEC is a low-displacement engine range codeveloped by Suzuki

Suzuki

is a Japanese multinational corporation headquartered in Hamamatsu, Japan that specializes in manufacturing compact automobiles and 4x4 vehicles, a full range of motorcycles, all-terrain vehicles , outboard marine engines, wheelchairs and a variety of other small internal combustion engines...

 and Daewoo Motors

GM Daewoo

GM Korea Company is South Korea's second largest automobile manufacturer and is a division of the General Motors Company. GM Korea's roots go back to the former Daewoo which was split from its parent company, Daewoo Group, in 2001...

 for use in micro- and subcompact cars.

The first model was 0.8 L Straight-3

Straight-3

A straight-three engine, also known as inline-three engine, or a triple, is a reciprocating piston internal combustion engine with three cylinders arranged in a straight line or plane, side by side....

 engine, based on the powerplant of the Suzuki Alto

Suzuki Alto

The Suzuki Alto is a small car designed by Suzuki. Its selling points include low price and good fuel economy. The model was introduced in 1979 and has been built in many countries worldwide.-1st generation :...

. It was used in Daewoo Tico

Daewoo Tico

The Daewoo Tico is a city car produced by the Korean automaker Daewoo from 1991 to 2001.The Tico was based on the 1988 Suzuki Alto. The car was equipped with a three-cylinder 796 cc S-TEC engine and had a five-speed manual transmission or three-speed automatic transmission. The Tico was...

 and later the Daewoo Matiz

Daewoo Matiz

-M100 :The production of Daewoo Matiz started in 1998 and it was sold in South Korea and many European markets with the code name M100. The exterior design is based on the Lucciola, a Fiat Cinquecento concept by Italdesign Giugiaro which had been rejected by Fiat. The 0.8-litre gasoline engine and...

.

In 2002, the range was extended to 1.0 L and 1.2 L straight-4

Straight-4

The inline-four engine or straight-four engine is an internal combustion engine with all four cylinders mounted in a straight line, or plane along the crankcase. The single bank of cylinders may be oriented in either a vertical or an inclined plane with all the pistons driving a common crankshaft....

 engines and updated with EGR valve to reduce pollution. 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 0.8/1.0 engines were updated again. New intake and exhaust systems, along with low-friction aluminum cam

Cam

A cam is a rotating or sliding piece in a mechanical linkage used especially in transforming rotary motion into linear motion or vice-versa. It is often a part of a rotating wheel or shaft that strikes a lever at one or more points on its circular path...

 followers with rollers were added, resulting in better economy. They are used in Chevrolet Matiz (model M200).

For 2008, a new 1.2 L version dubbed S-TEC II is introduced with the new Chevrolet Aveo

Chevrolet Aveo

The Chevrolet Aveo is a subcompact automobile manufactured since 2002, originally by the South Korean General Motors subsidiary, GM Daewoo—and later by other GM-affiliated entities...

 hatchback; new features include chain-driven 16-valve DOHC valvetrain

Valvetrain

Valvetrain is an all-encompassing term used to describe the mechanisms and parts which control the operation of the valves. A traditional reciprocating internal combustion engine uses valves to control air and fuel flow into and out of the cylinders, facilitating combustion.-Layout:Valvetrain: The...

 and variable intake geometry

Variable Length Intake Manifold

In internal combustion engines, a variable length intake manifold , or variable intake manifold is an automobile internal combustion engine manifold technology...

.