The Mitsubishi 4B4 engine is the newest all-alloy inline four-cylinder engines from Mitsubishi Motors, based on the 4A9 engine from 2004. But in terms of performance it can replace the bigger 4B1 engine.
| Mitsubishi 4B4 engine | |
|---|---|
 | |
| Overview | |
| Manufacturer | Mitsubishi Motors |
| Production | 2017–present |
| Layout | |
| Configuration | 4-cylinder |
| Displacement | 1.5 L (1,499 cc) |
| Cylinder bore | 75 mm (2.95 in) |
| Piston stroke | 84.8 mm (3.34 in) |
| Cylinder block material | Aluminum die cast |
| Cylinder head material | Aluminum die cast |
| Valvetrain | Direct acting DOHC, 16 valves, continuously variable MIVEC intake valve timing |
| Compression ratio | 10.0:1 |
| Combustion | |
| Turbocharger | with intercooler |
| Fuel system | Direct injection |
| Fuel type | Gasoline |
| Cooling system | Water-cooled |
| Output | |
| Power output | 120 kW (161 hp) |
| Specific power | 80.1 kW (107.4 hp) per litre |
| Torque output | 250 N⋅m (184 lb⋅ft) |
| Chronology | |
| Predecessor | Mitsubishi 4B1 engine |
Engine family characteristics
editThis new engine was developed in order to satisfy new performance, weight and ecological standards. It is derived from the older 4A91 engine. The cars that employ this engine demonstrate fall mainly in the middle of the pack of city SUVs and CUVs. Peak torque arrives at an unusually low 1800 rpm and maintains a flat plateau up to 4500 rpm.
4B40
editSpecifications
edit| Engine type | Inline turbo/intercooled 4-cylinder DOHC 16v MIVEC |
| Displacement | 1.5 L |
| Bore x Stroke | 75 mm × 84.8 mm (2.95 in × 3.34 in) |
| Compression ratio | 10.0:1 |
| Fuel system | Direct Injection (high pressure), port injection (low pressure). System has a normal fuel pump that feeds a shared fitting on the high pressure pump. One line off the fitting feeds the port injector fuel rail, then feeds the low pressure side of the high pressure pump. Both fuel rails are return-less with the high pressure fuel rail ending with a pressure sensor. |
| Peak power | 120 kW (161 hp) at 5500 rpm |
| Peak torque | 250 N⋅m (184 lb⋅ft) at 1800 to 4500 rpm |
Applications
edit- 2017–present Mitsubishi Eclipse Cross[1]
- 2023–present Mitsubishi Outlander[2]
See also
editReferences
edit- ^ "Mitsubishi Motors applies Outlander's platform to new compact SUV", Japan Today, March 7, 2017
- ^ "Mitsubishi Motors Starts Sales of the All-New Outlander in China" (Press release). Tokyo, Japan: Mitsubishi Motors. 2022-11-21. Retrieved 2023-01-01.