Mitsubishi Lancer, Mivec 2.0L 4B11 engine

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).

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.

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.

4B11 (2.0L 4 Cylinder NA)

Specifications
Engine type    Inline 4-cylinder DOHC 16v, MIVEC (intake only on PHEV)
Displacement    2.0 L (1,998 cc)
Bore    86 mm (3.39 in)
Stroke    86 mm (3.39 in)
Compression ratio    10.0:1
10.5:1 (PHEV) 

Fuel system    ECI-MULTI
Peak power    110–116 kW (150–158 PS; 148–156 bhp) at 6000 rpm
87 kW (118 PS; 117 bhp) at 4500 rpm (PHEV)

Peak torque    20.3 kg⋅m (199 N⋅m; 147 lbf⋅ft) at 4250 rpm
19.4 kg⋅m (190 N⋅m; 140 lbf⋅ft) at 4500 rpm (PHEV)

Applications
2007-2017 Mitsubishi Lancer/Galant Fortis
2012-2017 Citroen C4 Aircross
2007–2012 Peugeot 4007
2012-2017 Peugeot 4008
2009 Mitsubishi Outlander (Facelift Europe)
2012 Mitsubishi Outlander Sport
2013 Mitsubishi Outlander PHEV
2010 Mitsubishi ASX, Mitsubishi RVR (Canada)
2010-2015 Proton Inspira
2007-present Mitsubishi Delica
2018-present Mitsubishi Eclipse Cross

Characteristics
The bore and stroke of the engine both measure 86 mm (3.39 in), which engineers refer to as square. According to Mitsubishi, the new cylinder dimensions contribute to a free-revving character (max power at 6500 rpm), linear power delivery and wide torque curve. Mitsubishi used a timing chain instead of a belt for better reliability and iridium spark plugs to lower emissions and to help extend major service intervals for lower cost of ownership.

To reduce weight, Mitsubishi used a plastic cam cover and intake manifold and double-layer stainless steel exhaust manifold. The exhaust manifold has a rear location on the transverse engine, compared to the front location for the previous engine, yielding important benefits such as better emissions performance.

To lower vibration, Mitsubishi used a 4-point inertial axis system with cylindrical hydraulic engine mounts on the left and right sides. A lightweight, high-rigidity squeeze-cast aluminium bracket on the right side mount (engine side) lowers engine noise under acceleration. A lightweight, high-rigidity steel plate bracket on the left side mount (transmission side) lowers gear noise. A custom-tuned insulator was developed for the front and rear mounts to help control both idle vibration and acceleration shock.

For the Mitsubishi Outlander PHEV, a modified variant of the 4B11 is adopted. The MIVEC VVT system is only applied on the intake side, a balancer shaft derived from the 4B12 is adopted (in place of the standard oil pump), a linear Air/Fuel sensor fitted in place of the Oxygen sensor of front intake, unsymmetrical piston skirts, different pattern piston skirt resin coating & a unique resin coating crank shaft bearing is used. The PHEV 4B11 is restricted to a maximum operating speed of 4500 rpm to prevent damage to the electrical motors & generator from overspeeding.