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New BMW M3 and M4 engine secrets laid bare

BMW's M division has lifted the veil of secrecy on the inline six-cylinder engine bound for its upcoming M3 sedan and new-to-the-range M4 coupe and convertible, revealing a potent twin-turbocharged 3.0-liter direct injection gasoline unit that produces an official 424 hp at 7,500 rpm and what officials describe as "significantly more than 369 lb-ft" of torque. The newly developed engine, known under the internal codename S55 B30, shares its 84.0 mm bore and 89.6 mm stroke with BMW's standard turbocharged 3.0-liter in-line six-cylinder direct-injection gasoline mill, the M55 used across the German car maker's lineup, endowing the aluminum block unit with an overall swept volume of 2,979 cc. This represents a sizeable 990 cc reduction on the engine BMW's M division's new unit replaces, the S65.

GM looks to drop some weight with magnesium

Like many Americans, carmakers are on a continuing quest to lose weight. Less weight, which equals better fuel economy without a loss in performance, is a key selling point in dealerships. Weight loss is a key factor for two upcoming launches from General Motors--the redesigned full-size pickups and SUVs, and the redesigned 2014 Chevrolet Corvette.

MotorExpo London 2009 – a quick look

Merceeds Benz E Class is just one of the exhibitors at London' MotorExpo 2009 So it looks like, with a few exceptions such as the Geneva Motor Show, we will have to make do with ‘Boutique’ style shows. But at least they’re usually free and you do get pretty good access to the cars. And this week sees MotorExpo open for business in London’s Canary Wharf, with a reasonably impressive range of manufacturers showing up to display their latest wares, and a smattering of UK debuts to boot.