Ecotec 2.5

Generation I
Overview
Production	2000–2012
Combustion chamber
Displacement	1,998 cc (121.9 cu in) 2,198 cc (134.1 cu in)
Cylinder bore	86 mm (3.4 in)
Piston stroke	86 mm (3.4 in) 94.6 mm (3.72 in)
Compression ratio	8.8:1 9.5:1 10.0:1
Combustion
Fuel system	Sequential multi-point fuel injection Gasoline direct injection
Fuel type	Gasoline CNG E85
Dimensions
Length	665 mm (26.2 in)
Width	642 mm (25.3 in)
Height	655 mm (25.8 in)
Dry weight	139–150 kg (306–331 lb)

Generation II
Overview
Production	2006–present
Combustion chamber
Displacement	1,998 cc (121.9 cu in) 2,198 cc (134.1 cu in) 2,384 cc (145.5 cu in)
Cylinder bore	86 mm (3.4 in) 88 mm (3.5 in)
Piston stroke	86 mm (3.4 in) 94.6 mm (3.72 in) 98 mm (3.9 in)
Compression ratio	9.2:1 10.0:1 10.4:1 11.2:1 11.4:1
Combustion
Fuel system	Sequential multi-point fuel injection Gasoline direct injection
Fuel type	Gasoline E85

Generation III
Overview
Production	2013–present
Combustion chamber
Displacement	1,998 cc (121.9 cu in) 2,457 cc (149.9 cu in)
Cylinder bore	86 mm (3.4 in) 88 mm (3.5 in)
Piston stroke	86 mm (3.4 in) 100.8 mm (3.97 in)
Compression ratio	9.5:1 11.3:1
Combustion
Fuel system	Spark Ignition Direct Injection (SIDI)
Fuel type	Gasoline

The GM Ecotec engine, also known by its codename L850, is a family of all-aluminium inline-four engines, displacing between 2.0 and 2.5 litres. While these engines were based on the GM Family II engine, the architecture was substantially re-engineered for the new Ecotec application produced since 2000. This engine family replaced the GM Family II engine, the GM 122 engine, the Saab H engine, and the Quad 4 engine. It is manufactured in multiple locations, to include Spring Hill Manufacturing, in Spring Hill, Tennessee.

The 'Ecotec' name was adopted in 2000 for the new generation of Family II engines. The name was already used for the Opel GM Family II engine, Family 1 and Family 0 ranges. GM intends this new Ecotec to become its global 4-cylinder, and it has already fully replaced their OHV I4 line.

The Ecotec engine is a DOHC 4-valve design with an forged steel block and head (L850 for 86 mm bore applications, and L880 for 88 mm bore), designed for displacements from 1.8 to 2.4 L. Development began in 1994, by an international team of engineers and technicians from Opel's International Technical Development Center in Rüsselsheim, Germany, GM Powertrain in Pontiac, Michigan, and Saab in Södertälje, Sweden. Much of the development work on this project was carried out by Lotus Engineering, Hethel, United Kingdom. The engine uses aluminum pistons and cast iron cylinder liners. Vibration is reduced with twin balance shafts.

...
Wikipedia