Mitsubishi 4B1 engine-The Daily Ledger

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.

Mitsubishi 4B1 engine

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.

Mitsubishi 4B1 engine

4B10 (1.8L 4 Cylinder NA)

Mitsubishi 4B1 engine

Specifications

Applications

2007-2017 Mitsubishi Lancer

2010 Mitsubishi RVR (Japan) 2010-2015 Proton Inspira

Characteristics

4B11 (2.0L 4 Cylinder NA)

Specifications

Applications

2007-2017 Mitsubishi Lancer/Galant Fortis

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-now Mitsubishi Delica 2018-now Mitsubishi Eclipse Cross

Characteristics

The bore and stroke of the engine both measure , 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.

4B11T (2.0L 4 Cylinder Turbo)