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GM Small Gasoline Engine

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GM Small Gasoline Engine

Small Gasoline Engine
Manufacturer General Motors
Shanghai Automotive Industry Corporation
Also called Microtec
Production 2013 (2013)–present
Combustion chamber
Configuration Straight-3
  • 999 cc (61.0 cu in)
  • 1,117 cc (68.2 cu in)
  • 1,399 cc (85.4 cu in)
  • 1,490 cc (90.9 cu in)
Cylinder bore 74 mm (2.91 in)
Piston stroke
  • 77.4 mm (3.05 in)
  • 81.3 mm (3.20 in)
  • 86.6 mm (3.41 in)
Cylinder block alloy Aluminium
Cylinder head alloy Aluminium
Valvetrain DOHC
Compression ratio 10.0:1 - 12.5:1
Fuel system
Fuel type
Oil system Wet sump
Cooling system Water cooled
Power output 55–121 kW (75–165 PS)
Torque output 95–249 N·m (70–184 lb·ft)
Predecessor S-TEC
Family 0

Small Gasoline Engine (SGE) is a family of small-displacement 3-cylinder and 4-cylinder gasoline engines ranging from 1.0 L to 1.5 L, developed by Adam Opel AG, Shanghai Automotive Industry Corporation (SAIC), Shanghai GM (SGM) and the Pan-Asia Technical Automotive Center (PATAC).[1]

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 I3 DI DCVCP turbo (77.4 mm stroke), 1.1 L I3 PFI (86.6 mm stroke), 1.4 L I4 DI DCVCP turbo (81.3 mm stroke) and 1.5 L 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 turbocharer.[2]

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.[2]

All turbocharged variants will provide 90 percent of their max torque between 1500 and 5000 rpm, with peak power arriving between 5600 and 6000 rpm. The MHI turbos are sized to provide quick torque response, and are mounted very close to the cylinders, thanks to cylinder heads that incorporate the exhaust manifolds in the head.[2]

To reduce mass, the engines are compact in all directions, made almost entirely of aluminum, and feature composite intake manifolds. This removes 44 pounds (20 kg) from the existing 1.4-liter turbo in the Cruze and makes it 8 pounds (3,6 kg) lighter than the 1.4-liter VW turbo. GM say this engine weighs 216 pounds (98 kg), ready for installation.[2]

The engines will first debut in the 2014 Opel Adam [3] and will be produced in Szentgotthárd, Hungary[4][5] and GM's Flint Engine plant.[6] The new engine family will spread to other brands and markets by the end of the decade and will replace three separate engine families (S-TEC, Family 0, and Family 1).

The engine will be used in:

The assembly lines for North American facilities were manufactured by Hirata Corporation at their powertrain facility in Kumamoto, Japan.

See also


  1. ^ "Future Chevrolets to Benefit from Small Gas Engine Family". 2011-10-12. Retrieved 2012-05-29. 
  2. ^ a b c d "General Motors Details New Modular I-3, I-4 Engines"
  3. ^
  4. ^ "Opel Expands Engine Production in Szentgotthárd, Hungary". 2010-09-21. Retrieved 2012-05-29. 
  5. ^ Autonews: New Opel minicar set to debut small engine co-developed with China's SAIC
  6. ^ a b Loveday, Eric. "Official: 2016 Chevy Volt To Get 1.5-Liter, 4-Cylinder Range Extender". Inside EVs. Retrieved 28 October 2014. 
  7. ^

External links


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