BMW Debuts New R6 3.0L I-6 Powerplant in European-Only 630 Ci

While the addition of Valvetronic components would increase the engine's weight, a no-no in BMW's books, leaving

The R6 is one of the first mass-production motors to make use of a highly coveted metal, magnesium. (Photo: Shawn Pisio, Canadian Auto Press)

Valvetronic out would remove optimal improvements on engine performance and fuel consumption. BMW had to make it a mandatory component to the engine upgrade. To compensate for the additional kilos of the Valvetronic system, BMW subtracted weight by casting the crank-case, bedplate and cylinder head cover from magnesium. In comparison to other metals such as cast-iron, steel or aluminum, each commonly used for constructing engine blocks and components, magnesium is highly coveted for its superior strength and even lighter weight. The R6 is one of the first mass-production motors to make use of this metal, showing that BMW doesn't cut corners when developing its motors.

Other measures, such as a magnesium-aluminum camshaft that's 600 g (21.2 ounces) lighter than parts made from conventional metals -- 1.2 kg (2.6 lb) savings in a DOHC motor -- helps to create a lighter engine. The extent of the magnesium-rich diet has resulted in 10 kg (22.0 lbs), or 7 percent of the total engine's weight being shed.

BMWs, like most other German cars sold in North America, are considered premium performance vehicles. Such aren't

Valvetronic, as well as several other fuel-saving technologies, will cut down on the new six-cylinder engine's gas consumption. (Photo: BMW Canada)

usually friendly on the wallet when it comes to filling up at the pump. Valvetronic, as well as several other fuel-saving technologies, will cut down on the inline-six's thirst for liquid gold.

An electric water pump (a world's first), a single belt that drives all ancillary components, and a capacity controlled oil pump, all help to cut back on excessive energy use. Alone, the Valvetronic system has shown a 10 percent decrease in fuel consumption, meaning all other energy-saving components only add to the positive results. Actual fuel consumption figures are dependant on the car that this motor is fitted to. An X5, for instance, uses much more gasoline than a Z4 because of its greater curb weight and higher wind resistance, so it's best to wait for actual figures. Expect a 0.4 to 0.9 km/liter (1 to 2 mpg) improvement at the very least.