Air Intake & Fuel Delivery

The Mitsubishi 6B3 engine is Mitsubishi's newest family range of all-alloy V6 engines. Currently, only one engine has been developed, a 3.0 L V6 first introduced in the North American version of the second generation Mitsubishi Outlander which debuted in October 2006. more...

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All engines developed within this family have aluminum cylinder block and head, four valves per cylinder and MIVEC variable valve timing.

6B31

Specifications

Engine type — V6 cylinder , 60 degrees, SOHC 24v, MIVEC
Displacement — 2998 cc
Bore — 87.6 mm
Stroke — 82.9 mm
Compression ratio — 9.5:1
Power — 164 kW (223 PS) at 6250 rpm
Torque — 279 N·m (204 ft·lbf) at 4000 rpm
MIVEC switch — at 4750 rpm

Applications

2007 Mitsubishi Outlander;

Characteristics

The first of the main strategies used to achieve high output and low fuel consumption was to improve air intake efficiency by applying the MIVEC system (valve timing & lift switching-type), and also optimizing the intake/exhaust-ports in the cylinder head, and employing a variable intake manifold. The second strategy was to reduce mechanical friction by using an offset crankshaft and other technologies. The third strategy was to improve anti-knocking performance by more efficient cooling of the cylinder head/combustion chambers. The fourth strategy was to adopt twin knock sensors (for sensing & control in each bank) to optimize combustion.;

The 6B31 features an aluminum variable intake manifold that uses a resin-made 2-stage Induction Control Valve to provide the benefits of short and long intake tracts, automatically switching in response to engine speed. A flap inside the Induction Control Valve remains closed below 3,600 rpm, forcing the intake charge to take a longer route to the inlet valves. Over 3,600 rpm, the flap opens, providing a shorter tract to the valves to increase power. Positioning the EGR distribution inlet on the upper intake manifold, far from the throttle valve, improves real-world fuel consumption by lowering the temperature entering the EGR distribution passageway.;

A sophisticated electronically controlled multi-point fuel injection system ensures precision fuel delivery. The electronic throttle control system (throttle-by-wire) eliminates the mechanical linkage between the accelerator pedal and the throttle plate. Looping the fuel line around the engine improves exhaust gas performance by reducing fuel temperature differences between the delivery pipes, reducing pulsations within the delivery pipes, and suppressing variations in the amount of fuel injected. A combination of the MIVEC – a variable valve timing and lift system – and a two-stage variable intake manifold ensure a broad torque curve. The 6B31 provides nearly 90 percent of peak torque from just 2,000 rpm.;

Read more at Wikipedia.org