2004 BMW Alpina B7 Wallpaper

To achieve optimum agility and handling, ALPINA made a point of basing the B7 on the BMW 7 Series with V8 engine. The V8 offers the best jumping-off point in terms of dynamism, with an ideal 50/50 weight balance, also weighing around 150 kg less than the comparable V12 model.

The B7 designation carries with long tradition, and has stood for charged engines at ALPINA since the late 1970s. The main stuff of the B7 is a 4.4 litre V8 engine that is charged through the use of a radial (Nautilus-type) compressor. The combination of Valvetronic and charging represents a premiere. Through the use of Valvetronic’s complete functionality, the charge is controlled by varying the valve opening depth and the boost pressure.

The radial compressor is driven by a dedicated poly-V-belt, separate from the serpentine belts running other aggregates. At low rpm, a clutch de-couples the compressor from its drive-belt. The compressed air charge reaches the engine via an air-to-air intercooler.

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