Mitsubishi 4N1 engine

The Mitsubishi 4N1 engine is a family of all-alloy four-cylinder diesel engines developed by Mitsubishi Motors, produced at the company's powertrain facility in Kyoto, Japan for use in Mitsubishi's small to mid-sized global passenger cars.^[1][2][3]

In June 2006, Mitsubishi Motors and Mitsubishi Heavy Industries announced a joint development project for a new generation of clean diesel engines to be used in cars exported to Europe with a target of beginning mass production in 2010^[2] and later announced that the engines will be gradually phased into other global markets.^[3][4]

The preliminary version of the 1798 cc engine was first seen in the Concept-cX test car introduced in 2007. The larger 2268 cc was first exhibited in the Concept-ZT test car introduced in the same year and later used in the Concept-RA test car introduced in 2008.^[5][6][7][8]

With a clean diesel emission performance in mind, all engines are designed to comply with Tier 2 Bin 5 emission regulations in the United States, Euro 5 standard in Europe and Japan's Post New Long Term regulations.^[1][3][8]

Together with Mitsubishi's electric vehicle technology the new diesel engines are positioned as a core element in the Mitsubishi Motors Environment Initiative Program 2010 (EIP 2010) announced in July 2006.^[3][9]

The 4N1 engine family is the world's first to feature a variable valve timing (intake side) system applied to passenger car diesel engines.^[10]

All engines developed within this family have aluminum cylinder block, double overhead camshaft layouts, four valves per cylinder, a common rail injection system with a variable geometry turbocharger and MIVEC variable valve timing.

Engine family characteristics

Mitsubishi's new clean diesel engines use a 200 MPa (2,000 bar) high-pressure common rail injection system to improve combustion efficiency. The 4N13 1.8-liter uses solenoid fuel-injectors. The larger 4N14 2.3-liter engine uses piezo fuel-injectors that produce a finer fuel spray. Both engines feature a fast ceramic glowplug system. The engines are designed to operate at a lower compression ratio, thus lowering the combustion pressure, allowing the use of an aluminium cylinder block that reduces weight.^[1][11]

The 4N13 1.8-liter engine uses a Variable Geometry (VG) turbocharger with a variable vane turbine, which provides optimal boost pressure control for different driving conditions. The 4N14 2.3-liter engine also uses a VG turbocharger plus a Variable Diffuser (VD) that uses both variable geometry vanes in the turbine housing and a compressor with variable vanes in the diffuser passage, further improving combustion efficiency.^[1][11]

Within the engine, Mitsubishi used an offset angle crankshaft that reduces friction, therefore noise and vibration, allowing the engine to run smoothly and quietly at all engine speeds.^[1][11]

To meet the requirements of global emissions standards, Mitsubishi developed a new catalyst system that combines a Diesel Oxidation Catalyst (DOC), NOx Trap Catalyst (NTC) and Diesel Particulate Filter (DPF).^[1][11]

4N13

Specifications

Applications

• 2010 Mitsubishi ASX (RVR)
• 2010 Mitsubishi Lancer
• 2012 Peugeot 4008
• 2012 Citroën C4 Aircross

4N14

Specifications

Applications

• 2010 Mitsubishi Outlander
• 2012 Mitsubishi Delica D5 (without variable timing, 148ps/360Nm)

4N15

Specifications

Applications

• 2015 Mitsubishi Triton
• 2015 Mitsubishi All New Pajero Sport

See also

• List of Mitsubishi engines

References

External links

• Mitsubishi Motors Japan Clean diesel page (JAPANESE)