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Mitsubishi 4B4 engine

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Reciprocating internal combustion engine
Mitsubishi 4B4 engine
Overview
ManufacturerMitsubishi Motors
Production2017–present
Layout
Configuration4-cylinder
Displacement1.5 L (1,499 cc)
Cylinder bore75 mm (2.95 in)
Piston stroke84.8 mm (3.34 in)
Cylinder block materialAluminum die cast
Cylinder head materialAluminum die cast
ValvetrainDirect acting DOHC, 16 valves, continuously variable MIVEC intake valve timing
Compression ratio10.0:1
Combustion
Turbochargerwith intercooler
Fuel systemDirect injection
Fuel typeGasoline
Cooling systemWater-cooled
Output
Power output120 kW (161 hp)
Specific power80.1 kW (107.4 hp) per litre
Torque output250 N⋅m (184 lb⋅ft)
Chronology
PredecessorMitsubishi 4B1 engine

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.

Engine family characteristics

This 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

Specifications

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

See also

References

  1. "Mitsubishi Motors applies Outlander's platform to new compact SUV", Japan Today, March 7, 2017
  2. "Mitsubishi Motors Starts Sales of the All-New Outlander in China" (Press release). Tokyo, Japan: Mitsubishi Motors. 2022-11-21. Retrieved 2023-01-01.
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