GM Medium Diesel engine
| Medium diesel engine | |
|---|---|
| Overview | |
| Manufacturer | General Motors |
| Production | 2013–present |
| Combustion chamber | |
| Configuration | l4 |
| Displacement | 1,598 cc (97.5 cu in) |
| Cylinder bore | 79.7 mm (3.14 in) |
| Piston stroke | 80.1 mm (3.15 in) |
| Cylinder block alloy | Aluminium |
| Cylinder head alloy | Aluminium |
| Valvetrain | DOHC |
| Compression ratio | 16:1 |
| Combustion | |
| Fuel system | Common rail |
| Fuel type | Diesel |
| Output | |
| Power output | 95 - 160 PS |
| Torque output | 280 - 350 Nm |
| Chronology | |
| Predecessor | Family B/Circle L engine |
The Medium Diesel Engine (MDE) is a four-cylinder diesel engine developed by Adam Opel AG and branded "1.6 CDTI Ecotec" in most markets. Opel also adds the marketing term "Whisper Diesel" in some markets, claiming relatively low levels of noise, vibration, and harshness. Production commenced in late 2013 at Szentgotthárd, Hungary. The MDE is Opel's first all-aluminum diesel engine and offers a power density of 85 HP per liter (136 PS) in its most powerful version. Maximum power and torque have been increased versus the previous-generation 1.7-liter engine, while fuel consumption has been reduced by up to 10 percent compared with a 2.0-liter CDTI engine of similar power output. This new 1.6 CDTI engine will replace the current 1.7-liter and lower-powered 2.0-liter diesel engines in a wide range of Opel models, with more- and less-powerful versions to come. The most powerful version of this engine, delivering 136 PS (100 kW; 134 hp) at 3,500–4,000 rpm and 320 N·m (236 lbf·ft) at 2,000 rpm, was first introduced in the 2013 Opel Zafira Tourer, and later in the 2014 Opel Astra J and restyled 2014 Opel Meriva B. In 2014, versions were released with power outputs of 110 PS and 95 PS.
The engine's displacement is 1,598 cc and it has a bore/stroke ratio of 79.7/80.1 mm, attaining cylinder pressures of 180 bar and a compression ratio of 16:1. It uses an aluminum engine block, die-cast aluminum bedplate, and am aluminum cylinder head. A chain-driven dual overhead camshaft with dual continuous variable cam phasing, employing weight-saving hollow sections and lobes, operates four valves per cylinder with low-friction, hydraulic roller finger followers. The pistons are made from aluminum for reduced reciprocating mass, feature a concave, shallow-bowl profile to facilitate efficient combustion, and are cooled by under-skirt oil spraying. The crankshaft employs four counterweights to minimize mass, and both it and the con-rods are made of forged steel. The engine features multiple improvements to reduce NVH, such as a cam cover made of GRP and fully decoupled from the engine to reduce noise and vibration, while also saving weight compared to aluminum; a composite intake manifold encapsulated in acoustic padding as well as an external plastic shield that both significantly reduce noise emissions; a mechanical crankshaft isolator which reduces radiated noise and torsional vibrations in the accessory drive system; and scissor gears for the timing drive system, incorporating tooth profiles ground with a Low Noise Shifting (LNS) process for optimal noise reduction. More than 150 patented diesel control functions are deployed by the engine's ECU, which was developed in-house by General Motors and jointly engineered in Italy (by GM Powertrain Torino), Germany, and the United States, and will be used in all future GM four-cylinder diesel engines.
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