Mitsubishi 4B4 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

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

• 2017–present Mitsubishi Eclipse Cross ^[1]
• 2023–present Mitsubishi Outlander (with mild hybrid) ^{[2] [3]}
• 2025–present Mitsubishi Destinator

See also

• List of Mitsubishi engines

References

1. "Mitsubishi Motors applies Outlander's platform to new compact SUV". Japan Today . 2017-03-07. Retrieved 2025-03-18.
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.
3. Gauthier, Michael (2025-07-17). "Mitsubishi's Best-Selling Vehicle Is Going Hybrid-Only For 2026". Carscoops. US: Carscoops. Retrieved 2025-07-17.