GM Medium Gasoline Engine
| Medium Gasoline Engine | |
|---|---|
| Overview | |
| Manufacturer | General Motors |
| Also called | MGE |
| Production | 2012–present |
| Combustion chamber | |
| Configuration | l4 |
| Displacement |
|
| Cylinder bore |
|
| Piston stroke |
|
| Cylinder block alloy | Cast iron |
| Cylinder head alloy | Aluminum |
| Valvetrain | DOHC |
| Compression ratio |
|
| Combustion | |
| Fuel system | Gasoline direct injection |
| Fuel type | Gasoline |
| Oil system | Wet sump |
| Cooling system | Water-cooled |
| Dimensions | |
| Length |
|
| Width |
|
| Height | 701 mm (27.6 in) |
| Dry weight | 109–142 kg (240.3–313.1 lb) |
| Chronology | |
| Predecessor | Family 1 |
Medium Gasoline Engine (MGE) is a medium-displacement 4-cylinder gasoline engine developed by Adam Opel AG and marketed as 'SIDI Ecotec'. Production began in late 2012 at Szentgotthárd, Hungary. The engine features Start/Stop and reduces fuel consumption and CO2 emissions by 13 percent comparing to the predecessor, while maintaining Euro 6 emissions standards.
A turbocharged Eco variant delivering 170 PS (125 kW; 168 hp) @ 4250 rpm and 260 N·m (192 lbf·ft) @ 1650-4250 rpm (overboost 280 N·m (207 lbf·ft)) has been introduced at 2012 Moscow International Automobile Salon (MIAS); a Performance version with maximum torque 300 N·m (221 lbf·ft) and peak power 200 PS (147 kW; 197 hp) will also be available. Each version features unique turbine aerodynamic, and aggressive boost strategies improve low-end torque.
The high-performance turbocharged 1.6 L (1598 cc) engine with central direct injection has 79.0 mm (3.1 in) bore and 81.5 mm (3.2 in) stroke, with cylinder pressure of 130 bar and compression ratio of 9.5:1 for Performance version and 10.5:1 for Eco version. It uses a grey cast-iron block with die-cast aluminum bedplate, aluminum cylinder head, chain-driven DOHC valvetrain with hydraulic tensioners, dual continuous variable cam phasing, and forged steel crankshaft. The engine has twin balance shafts and specially designed cam cover to improve NVH, while optimized compressor geometry, acoustic resonators and overall air handling help reduce noise by 2 dB. Centrally placed injector allows optimal operation in both stratified and homogeneous charge ignition. Optimized main bearing journal diameter, roller cam followers, and PVD coated piston rings reduce friction.
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