Engineering:Mitsubishi 4B4 engine

4B4
Overview
Production	2017–present
Layout
Block material	Aluminum die cast
Head material	Aluminum die cast
Valvetrain	Direct acting DOHC, 16 valves, continuously variable MIVEC intake valve timing
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	75 mm
Stroke	84.8 mm
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 Mitsubishi Eclipse Cross

See also

• List of Mitsubishi engines