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6 Series Coupe and Cabrio Facelift - e63/e64 ( 2007 - ... ) |
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Page 5 of 14 Drivetrain:
Superior Power, new Versatility.
• Top engine: eight-cylinder developing 270 kW/367 hp.
• Premiere: straight-six with High Precision Injection.
• First diesel in the segment: Variable Twin Turbo, 210 kW/286 hp.
Right from the start, the broad range of engines for the BMW 6 Series has left hardly anything to be desired. And now perhaps the last desire is being fulfilled, both the Coupé and Convertible coming for the first time with diesel power. So the enthusiast who really appreciates the qualities of this engine concept is now able to opt for the most powerful straight-six diesel in the world in both the BMW 635d Coupé and the new BMW 635d Convertible, a 3.0-litre featuring Variable Twin Turbo technology and developing maximum output of 210 kW/286 hp.
This outstanding power is exceeded only by the 270 kW/367 hp eight-cylinder displacing 4.8 litres, the top-of the-range power unit also in the new BMW 6 Series.
Yet another innovation in the engine range is the 3.0-litre straight-six High Precision Injection gasoline engine operating with direct fuel injection also in the lean-burn mode. Developing 200 kW/272 hp, this new, upgraded power unit outperforms its predecessor by a significant 10 kW or 14 hp.
Despite this increase in power and performance, both the new BMW 630i Coupé and the new BMW 630i Convertible offer a decrease in average fuel consumption of up to 15 per cent. And it almost goes without saying that the new BMW 635d ensures an even higher standard of all-round economy quite unprecedented in this segment: Despite the superior performance also offered by this model variant, average fuel consumption of the new BMW 635d Coupé in the EU test cycle is just 6.9 litres, equal to 40.9 mpg imp (BMW 635d Convertible: 7.2 litres or 39.2 mpg imp).
BMW’s principle of EfficientDynamics is also clearly borne out by the new BMW 650i, where the introduction of numerous improvements for extra efficiency serves to reduce average fuel consumption in both the Coupé and Convertible by up to 5 per cent versus the former models.
In conjunction with the new six-speed automatic sports transmission, the gasoline engine versions offer the same or even lower fuel consumption in the EU test cycle than their respective counterparts with a manual gearbox.
Powerful, superior and even more efficient: the eight-cylinder.
The eight-cylinder power unit ranking right at the top of the BMW 6 Series fulfils the greatest demands in terms of motoring refinement and culture – also because a V8 ensures superior prestige right from the start.
The drive unit in the BMW 650i Coupé and the BMW 650i Convertible justifies this supreme position through the most demanding technology and truly impressive performance data: This ultra-modern aluminium engine features throttle-free VALVETRONIC valve management, variable double-VANOS camshaft control on both the intake and outlet side, as well as an intake system switching to two different stages. And thanks to these highlights in technology, the newly tuned engine management and a wide range of improvements serving to minimise fuel consumption, the eight-cylinder offers not only supreme running smoothness, direct response to the accelerator pedal and a truly muscular torque curve, but also low exhaust emissions.
The 4.8-litre power unit develops maximum output of 270 kW/367 hp and peak torque of 490 Newton-metres/361 lb-ft. The result is a level of performance which raises both the Coupé and Convertible to the same standard as a thoroughbred sports car, the BMW 650i Coupé accelerating to 100 km/h in 5.1 the BMW 650i Convertible in 5.5 seconds. The top speed of both models, in turn, is limited electronically to 250 km/h or 155 mph.
Over and above this dynamic performance, the eight-cylinder also offers unprecedented economy for an engine of this calibre: Average fuel consumption in the EU test cycle is 11.7 litres/100 kilometres on the Coupé and 12.6 litres/100 kilometres on the Convertible, equal to 24.1 and, respectively, 22.4 mpg imp. And in addition, the greater efficiency appropriate in this day and age has also been considered in developing the new automatic transmission for the BMW 6 Series, with the BMW 650i Coupé featuring the new six-speed automatic transmission consuming just 10.5 litres, the BMW 650i Convertible, again with the new transmission, requiring only 10.9 litres, equal to 26.9 and 25.9 mpg imp.
Fascinating progress: straight-six power unit with High Precision Injection in the lean-burn mode.
The dynamic and, at the same time, highly progressive character of the new BMW 6 Series is clearly expressed by the fact that all the power units represent the latest state of the art in BMW engine development.
Hence, even the “basic” engine in the range is up-to-date in every respect, the 3.0-litre straight-six in the new BMW 630i Coupé and the new BMW 630i Convertible featuring direct fuel injection in the lean-burn mode for a particularly thrilling interpretation of BMW EfficientDynamics. Indeed, this new power unit gives both models even better performance and offers even greater economy than the former engine.
The second generation of direct gasoline injection referred to by BMW as High Precision Injection uses piezo-injectors for a particularly precise injection process allowing fuel-saving lean-burn operation of the engine throughout a particularly wide range of engine speeds and running conditions. Positioned between the valves, these innovative injectors inject the fuel in the immediate vicinity of the spark plug. This specific configuration made possible by BMW’s engine development specialists despite the very confined space available provides the prerequisite for the new, jet-guided combustion process avoiding the loss of fuel (spray and scatter effect) otherwise encountered when spraying the fuel on to the walls of the cylinder.
Thanks to this technology, High Precision Injection ensures significant advantages in fuel economy also under everyday driving conditions, while at the same time retaining all the qualities typical of a BMW straight-six – dynamic power and performance, fast and free engine revving behaviour, and exemplary smoothness and refinement.
Second-generation direct fuel injection: efficiency through precision.
The new piezo-injectors deliver fuel into the cylinders at a pressure of up to 200 bar, thus providing a particularly fine fuel/air mixture. The specific amount injected is tailored precisely to the power and performance required by the driver in each case, including the optimised pre- and after-injection phase. Applying this innovation, BMW’s engineers not only enhance the efficiency of the engine, but also improve its response and behaviour in general.
Direct injection in the lean-burn mode gives the new six-cylinder power unit of the BMW 630i truly outstanding, all-round economy. Referred to also as the stratified charge principle, lean-burn injection enables the engine to develop superior power on a small amount of fuel, with various layers (strata) of the fuel/air mixture forming in the combustion chamber when driving in the lean-burn mode. A fuel/air layer sufficiently rich and thus easily ignitable is formed only in the immediate vicinity of the spark plug. Then, once this richer layer starts to burn, the leaner layers further away from the spark plug take up the flame and also start to burn.
This innovative technology reduces fuel consumption in the EU test cycle by approximately 10 per cent versus the previous engine with fully variable valve drive, which as such was already very efficient. And contrary to first-generation direct gasoline injection which BMW never used due to its inherent drawbacks, High Precision Injection allows fuel-efficient lean-burn operation throughout a wide range of engine loads, also at higher engine speeds.
In the new BMW 630i Coupé and the BMW 630i Convertible the 3.0-litre straight-six petrol engine develops a sporting 200 kW/272 hp, that is 10 kW/14 hp more than the former engine with conventional fuel/air mixture formation. Maximum torque, in turn, is 320 Newton-metres or 236 lb-ft.
With this kind of power, the Coupé takes just 6.2 seconds to accelerate to 100 km/h, and the BMW 630i Convertible is almost as fast, completing the same exercise in 6.7 seconds. Top speed on both cars is limited electronically to 250 km/h or 155 mph.
Fuel consumption of the BMW 630i in the EU test cycle is 7.9 litres/100 kilometres on the Coupé and, respectively, 8.3 litres/100 kilometres for the Convertible (equal to 35.8 and, respectively, 34.0 mpg imp), that is up to 15 per cent below the fuel consumption of the former models.
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