Mitsubishi 4N1 engine | |
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Overview | |
Manufacturer | Mitsubishi Motors |
Production | 2010–present |
Layout | |
Configuration | 4-cylinder |
Displacement | 1.8–2.4 L (1,798–2,442 cc) |
Cylinder bore | 83 mm (3.27 in) 86 mm (3.39 in) |
Piston stroke | 83.1 mm (3.27 in) 97.6 mm (3.84 in) 105.1 mm (4.14 in) |
Cylinder block material | Aluminium die cast |
Cylinder head material | Aluminium die cast |
Valvetrain | DOHC, 16 valves, variable valve timing MIVEC (intake) |
Compression ratio | 14.9:1-15.5:1 |
Combustion | |
Turbocharger | Variable geometry with intercooler |
Fuel system | Common rail direct injection |
Fuel type | Diesel |
Cooling system | Water-cooled |
Output | |
Power output | 85–150 kW (116–204 PS) |
Torque output | 300–470 N⋅m (221–347 lb⋅ft) |
Chronology | |
Predecessor | Mitsubishi Sirius engine (Diesel Engine) |
The Mitsubishi 4N1 engines are 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 Mitsubishi Heavy Industries and Renault 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 1.8 L (1,798 cc) engine was first seen in the Concept-cX test car introduced in 2007. The larger 2.3 L (2,268 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 aluminium cylinder block, double overhead camshaft layouts, 4 valves per cylinder, a common rail injection system with a variable-geometry turbocharger. Most of those engine have the MIVEC variable valve timing system. The 4N14 2.3 L (2,268 cc) has been distributed in the ASX and Delica without MIVEC .
Mitsubishi's new clean diesel engines use a 200 MPa (2,000 bar) high-pressure common rail injection system to improve combustion efficiency. The 4N131.8 L (1,798 cc) uses solenoid fuel-injectors. The larger 4N142.3 L (2,268 cc) 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 4N131.8 L (1,798 cc) engine uses a Variable Geometry (VG) turbocharger with a variable vane turbine, which provides optimal boost pressure control for different driving conditions. The 4N142.3 L (2,268 cc) 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]
Engine type | Inline 4-cylinder, DOHC 16v, MIVEC (intake) |
Displacement | 1.8 L (1,798 cc) |
Bore x Stroke | 83 mm × 83.1 mm (3.27 in × 3.27 in) |
Compression ratio | 14.9:1 |
Turbocharger | variable geometry turbocharger with intercooler |
Fuel system | Common rail with solenoid injectors |
Peak power | 110 kW (150 PS) at 4000 rpm 85 kW (116 PS) at 4000 rpm (low power version) |
Peak torque | 300 N⋅m (221 lb⋅ft) at 2000-3000 rpm |
Engine type | Inline 4-cylinder, DOHC 16v, MIVEC |
Displacement | 2.3 L (2,268 cc) |
Bore x Stroke | 86 mm × 97.6 mm (3.39 in × 3.84 in) |
Turbocharger | variable geometry turbocharger / variable diffuser, intercooler |
Fuel system | Common rail with piezo injectors (CRDi) |
Peak power | 130 kW (177 PS; 174 hp) at 3500 rpm [12] 110 kW at 3500 rpm without MIVEC [13] |
Peak torque | 380 N⋅m (280 lb⋅ft) at 2000 rpm 360 N⋅m (266 lb⋅ft) at 1500-2750 rpm without MIVEC |
Engine type | Inline 4-cylinder, DOHC 16v, MIVEC |
Displacement | 2.4 L (2,442 cc) |
Bore x Stroke | 86 mm × 105.1 mm (3.39 in × 4.14 in) |
Compression ratio | 15.5:1 |
Turbocharger | variable geometry turbocharger / variable diffuser, intercooler |
Fuel system | Common rail with electromagnetic solenoid injectors |
Peak power | 133 kW (181 PS) at 3,500 rpm [15] |
Peak torque | 430 N⋅m (317 lb⋅ft) at 2,500 rpm |
Engine type | Inline 4-cylinder, DOHC 16v, MIVEC |
Displacement | 2.4 L (2,439 cc) |
Bore x Stroke | 86 mm × 105 mm (3.39 in × 4.13 in) |
Compression ratio | 15.1–15.2:1 |
Turbocharger | variable geometry turbocharger / variable diffuser, intercooler |
Fuel system | Common rail |
Peak power | 97–150 kW (132–204 PS) at 3,250–3,500 rpm |
Peak torque | 330–470 N⋅m (243–347 lb⋅ft) at 1,500–3,000 rpm |
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