Mitsubishi 4B1 engine

Mitsubishi 4B1 engine
Overview
ManufacturerMitsubishi Motors
Also calledWorld Engine
Production2007–present
Layout
ConfigurationInline-four
Displacement
  • 1.8 L (1,798 cc)
  • 2.0 L (1,998 cc)
  • 2.4 L (2,360 cc)
Cylinder bore86 mm (3.39 in)
88 mm (3.46 in)
Piston stroke77.4 mm (3.05 in)
86 mm (3.39 in)
97 mm (3.82 in)
Cylinder block materialAluminium die cast
Cylinder head materialAluminium die cast
ValvetrainDirect acting DOHC, 16 valves, continuously variable MIVEC intake and exhaust valve timing
Compression ratio9.0:1, 10.0:1, 10.5:1,
Combustion
TurbochargerOn some versions
Fuel systemFuel injection
Fuel typeGasoline
Cooling systemWater-cooled
Output
Power outputFrom 140 to 446 PS (103 to 328 kW; 138 to 440 bhp)
Torque outputFrom 14.5 to 56.961 kg⋅m (142 to 559 N⋅m; 105 to 412 lbf⋅ft)
Chronology
PredecessorMitsubishi Sirius engine (Gasoline Engine)
SuccessorMitsubishi 4J1 engine (SOHC)
Mitsubishi 4B4 engine (DOHC)

The Mitsubishi 4B1 engine is a range of all-alloy straight-4 piston engines built at Mitsubishi's Japanese "World Engine" powertrain plant in Shiga on the basis of the Global Engine Manufacturing Alliance (GEMA).[1][2][3] Although the basic designs of the various engines are the same, their exact specifications are individually tailored for each partner (Chrysler, Mitsubishi, and Hyundai). The cylinder block and other basic structural parts of the engine were jointly developed by the GEMA companies, but the intake and exhaust manifolds, the cylinder head's intake and exhaust ports, and other elements related to engine tuning were independently developed by Mitsubishi.[1]

All engines developed within this family have aluminium cylinder block and head, 4 valves per cylinder, double overhead camshaft layouts, and MIVEC continuous variable valve timing. All variations of 4B1 engine share the same engine block with a 96 mm bore pitch. The difference in displacement is achieved by variance in bore and stroke.[4]

The 4B1 engine family is the first to have the continuously variable valve timing MIVEC system applied not only to its intake valves but also to its exhaust valves. The intake and exhaust cam timing is continuously independently controlled and provide four optimized engine operating modes.[1][5]