GM small gasoline engine
| Small Gasoline Engine | |
|---|---|
 |
|
| Overview | |
| Manufacturer |
General Motors MG Motor Shanghai Automotive Industry Corporation Hirata Corporation |
| Also called | Microtec |
| Production | 2013–present |
| Combustion chamber | |
| Configuration |
Straight-3 Straight-4 |
| Displacement |
|
| Cylinder bore | 74 mm (2.91 in) |
| Piston stroke |
|
| Cylinder block alloy | Aluminium |
| Cylinder head alloy | Aluminium |
| Valvetrain | DOHC |
| Compression ratio | 10.0:1 - 12.5:1 |
| Combustion | |
| Fuel system | |
| Fuel type | |
| Oil system | Wet sump |
| Cooling system | Water cooled |
| Output | |
| Power output | 55–121 kW (75–165 PS) |
| Torque output | 95–249 N·m (70–184 lb·ft) |
| Chronology | |
| Predecessor |
S-TEC Family 0 |
The small gasoline engine (SGE) is a family of small-displacement three- and four-cylinder gasoline engines ranging from 1.0 L to 1.5 L, developed by Adam Opel AG, Shanghai Automotive Industry Corporation (SAIC), MG Motor (MG), Shanghai GM (SGM) and the Pan-Asia Technical Automotive Center (PATAC).
The new global family is designed to improve fuel economy, performance, and emissions, reduce noise and vibrations. To achieve this, it features lightweight design and advanced technologies like gasoline direct injection, turbocharging, variable length intake manifold and alternative fuel compatibility. It utilizes modular approach with interchangeable components that can be suited to specific application.
The initial engine variants include 1.0 L (999 cc) I3 DI DCVCP turbo (77.4 mm stroke), 1.1 L (1118 cc) I3 PFI (86.6 mm stroke), 1.4 L (1399 cc) I4 DI DCVCP turbo (81.3 mm stroke) and 1.5 L (1490 cc) I4 PFI (86.6 mm stroke). All are derived from just two blocks (three and four cylinder) sharing a common 74-mm bore with 81-mm bore spacing. Mitsubishi Heavy Industries provides one-stage single-scroll turbocharger.
To aid with NVH (Noise, vibration, and harshness) levels the direct injection fuel rail mounts to the cylinder head and valve cover via bushings that isolate that loud ticking noise the injector pintles make. GM claims that the 1.0-liter turbo is 25 percent (3 dBA) quieter than the Ford Fiesta’s 1.0-liter turbo, and the 1.4-liter is up to 50 percent (6 dBA) quieter than the VW/Audi 1.4-liter turbo. Other silencing measures include a bed-plate cylinder block that increases stiffness, a stiffened aluminum front cam cover. Three-cylinder variants get a counter-rotating (engine-speed) balance shaft that’s integrated with the oil pump and located inside the two-piece aluminum oil pan to prevent radiated noise. GM assure the EcoTec triple will idle more smoothly than Ford’s three-cylinder, which does not use a shaft.
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Wikipedia