Bmw 5 Bedienungsanleitung PDF herunterladen (Seite 30)

BMW

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11/2009

Page 30

The petrol engines in the new BMW 5 Series:

a perfect combination of innovations for supreme efficiency.

Offering the spontaneity, fast-revving performance and refinement so

typical of the brand, combined with unparalleled efficiency, the petrol

engines featured in the new BMW 5 Series Sedan come with a standard

quite unparalleled in the market. Both the eight-cylinder power unit in

the top-of-the-range BMW 550i and the three straight-six engines come

with outstanding technical innovations created in the context of

BMW EfficientDynamics. And the specific combination of technologies

gives each of the four drive units its own quite unique characteristics.

The most important feature shared by all petrol engines is fuel supply by

means of second-generation direct fuel injection. Already well-known as

High Precision Injection, this advanced system uses injectors positioned

in the middle between the valves and in the immediate vicinity of the spark

plug for the precise dosage of fuel, measurably reducing fuel consumption

also in everyday traffic.

A particularly efficient version of High Precision Injection is to be admired in

the six-cylinder engines driving the new BMW 528i and the new BMW 523i.

Direct injection in the lean-burn mode gives these models particularly good

fuel economy. Referred to as stratified charging, this process forms various

interacting layers of different fuel/air mixtures within the combustion chamber,

the share of petrol in the mixture decreasing continuously with an increasing

distance from the spark plug. A particularly rich and therefore ignitable fuel/air

mixture is therefore available only in the direct vicinity of the spark plug.

As soon as this mixture is ignited, the leaner layers at a greater distance from

the spark plug will also burn in a clean and consistent process.

In the V8 power unit of the new BMW 550i and in the straight-six engine

featured in the new BMW 535i High Precision Injection is combined with

turbocharging. BMW TwinPower Turbo Technology provides power and

performance characteristics a naturally-aspirated engine would only be able

to offer on much larger capacity, making it heavier and obviously consuming

more fuel and generating more emissions.

The eight-cylinder with BMW TwinPower Turbo and High Precision Injection

is the only petrol engine of its kind with a turbocharger and catalysts arranged

within the V-section between the two rows of cylinders, and at the same time

it is the world’s most efficient power unit in its performance class. Compared

with its predecessor, the new BMW 550i offers 30 kW more power on

approximately 5 per cent less fuel.

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