As one of Mazda's next-generation MZR engines, the newly-developed and significantly improved MZR-CD 2.2 balances power, fuel efficiency, exhaust emissions and noise/vibration/harshness (NVH) levels. It is a unique next-generation clean diesel engine.
The MZR-CD 2.2 offers top class torque and power, balanced with superb environmental performance and quietness. Additionally, the engine's diesel particulate filter (DPF) features a Mazda-developed world-first catalyst activation mechanism that enhances the removal of particulate matter (soot), a characteristic of diesel engine exhaust gases. The new catalytic combustion treatment process enables the DPF to burn off particulate matter approximately 60 percent faster than current systems. Due to this technical advancement, the MZR-CD 2.2 is clean enough to qualify for the Euro 5 emissions standards.
- Improved power and fuel efficiency
Mazda's newly developed clean diesel engine achieves top class torque of 400Nm and improved fuel efficiency through its updated fuel injectors, lower compression ratio and other enhancements.
- Advanced fuel injection and common rail systems
In order to reduce emissions and fuel consumption, it is necessary to more accurately optimize combustion conditions to match changes in engine load and speed. To achieve this, Mazda enhanced the fuel supply and common rail systems. The fuel pressure inside the common rail is increased to 200MPa (among the highest in the industry), the injector nozzles are almost 20 percent smaller than before, and the minimum injection interval is 30 percent shorter. As a result of these improvements, the fuel spray pattern is more accurate, and the fuel injection frequency, timing, volume and particle size can all be optimally controlled. The net effect is that fuel consumption and the amount of soot generated in the exhaust are reduced.
- Newly developed diesel particulate filter (DPF)
In order to combust the soot that is generated by diesel engines, the temperature of the exhaust gas must be increased. This requires additional fuel, which adversely affects overall fuel economy. The ceramic base material in Mazda's unique catalyst has a molecular structure that enables the movement of oxygen stored within it. This extra oxygen can be supplied as required to significantly increase the rate of particulate matter combustion. As a result the new catalyst mechanism reduces the amount of fuel required to burn off the particulates (soot). This improves the overall fuel economy, and results in lower CO2 emissions and cleaner exhaust gases.
- Balance shafts
Increasing the displacement of a diesel engine requires larger and heavier pistons. Heavier pistons produce stronger second-order oscillations (oscillations at twice the engine rpm). To suppress the engine's second-order oscillations and reduce overall vibration, we added a twin balance shaft. As a result, the engine is one of the quietest in its class.
- Low compression ratio and multi-stage injectors
A low compression ratio, precision fuel injection technology, a larger exhaust gas recirculation (EGR) system and a highly rigid lower block structure have enabled us to further reduce noise and vibration energy. These features make Mazda's new diesel engine surprisingly quiet and smooth.
- Major specification of the MZR-CD 2.2 engine
| Type | 2.2-liter DOHC common rail turbo diesel engine |
|---|---|
| Displacement | 2,184cc |
| Bore & stroke | 86.0mm×94.0mm |
| Maximum power output | 136kW(185PS) |
| Maximum torque | 400Nm/1800-3000rpm |