Nissan MR Engine - M9R DCi

M9R DCi

The M9R is a family of straight-4 automobile Diesel engines featuring a cast-iron block, co-developed by Renault and Nissan. Renault calls it the M engine. Other features of the engine are a double overhead camshaft, 16-valve layout and a silent timing chain.

When launched in 2006, press announcements claimed that "it provides the highest efficiency in its class".

The engine is available in the 150 PS (110 kW) tune in Nissan Qashqai, Nissan X-Trail, Renault Mégane, Renault Koleos and Renault Laguna models and in 175 PS (129 kW) form with particulate filter in Renault Laguna and Nissan X-Trail models. A 180 PS (132 kW) variant is also available on the Laguna GT.

The 150 PS (110 kW) version provides one of the highest efficiencies in its segment. Its maximum power is achieved at 4,000 rpm and torque is 340 N·m (250 lb·ft) at 2,000 rpm. The 175 PS (129 kW) version also became (as of 2006) the benchmark in the 2.0-litre diesel family car class. It was the only model to offer an engine with such a specific power output. Maximum power is achieved at 3,750 rpm and torque of 360 N·m (266 lb·ft) is available from 1,750 rpm. For example, Renault Laguna reaches 100 km/h (62 mph) in 8.4 seconds.

Control of noise levels was a priority during the design of this engine. The design of the bottom end, with an aluminum bearing ladder, allows better absorption of vibration. In order to further reduce vibrations, balance shafts are included in some versions of the engine. The 2.0 dCi engine in all its versions complies with the Euro 4 standards for exhaust emissions. The precisely controlled fuel injection, and the various systems allowing emissions to be reduced at source, result in a notable reduction of polluting emissions (NOx, CO, hydrocarbons and particulates). The 150 PS (110 kW) New Mégane and New Laguna respectively emitted 144 g/km and 154 g/km of CO2 and the 175 hp (127 kW) version of New Laguna 2.0 dCi emits 159 g/km of CO2; they all comply with the Euro 5 standards for exhaust emissions.

The 130 PS (96 kW) and 150 PS (110 kW) M9R engines for the Laguna were updated in 2011 to include some fuel emission optimizations:

• Stop & Start
• Thermal Management
• Electrical Smart Management

They were renamed "2.0 Energy dCi". The CO2 values were thus reduced to 118 g/km for both the 2.0 Energy dCi 130 and 2.0 Energy dCi 150.

It is fitted to the following vehicles:

• 2007–present Nissan Qashqai
• 2007–present Nissan X-Trail
• 2005–present Renault Laguna
• 2006–present Renault Mégane
• 2007–present Renault Koleos
• 2006–present Renault Espace
• 2007–2010 Renault Vel Satis