Mitsubishi 4B1 engine

Mitsubishi 4B1 engine
Overview
Manufacturer	Mitsubishi Motors
Also called	World Engine
Production	2007–present
Layout
Configuration	Inline-four
Displacement	1.8 L (1,798 cc) 2.0 L (1,998 cc) 2.4 L (2,360 cc)
Cylinder bore	86 mm (3.39 in) 88 mm (3.46 in)
Piston stroke	77.4 mm (3.05 in) 86 mm (3.39 in) 97 mm (3.82 in)
Cylinder block material	Aluminium die cast
Cylinder head material	Aluminium die cast
Valvetrain	Direct acting DOHC, 16 valves, continuously variable MIVEC intake and exhaust valve timing
Compression ratio	9.0:1, 10.0:1, 10.5:1,
Combustion
Turbocharger	On some versions
Fuel system	Fuel injection
Fuel type	Gasoline
Cooling system	Water-cooled
Output
Power output	From 140 to 409 PS (103 to 301 kW; 138 to 403 bhp)
Torque output	From 14.5 to 53.5 kg⋅m (142 to 525 N⋅m; 105 to 387 lbf⋅ft)
Chronology
Predecessor	Mitsubishi Sirius engine (Gasoline Engine)
Successor	Mitsubishi 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]