Instantaneous power development and majestic torque are the stand-out features of the two engines available for the new BMW 6 Series Convertible from launch. The V8 powerplant and six-cylinder in-line unit both have BMW TwinPower Turbo technology and direct injection, and combine their sporting character with outstanding smoothness and exceptional efficiency.
The 4.4-litre eight-cylinder engine in the new BMW 650i Convertible develops a maximum 300kW/407hp between 5,500 and 6,400rpm, and puts its peak torque of 600 Newton metres (443 lb-ft) on tap between 1,750 and 4,500rpm. This unique engine, whose turbochargers are positioned in the V-shaped area between the cylinder banks, produces an instantaneous and sustained wave of power, making it a feast for the enthusiast driver. The new BMW 650i Convertible completes the sprint from 0 to 62 mph in 5.0 seconds, and the engine electronics eventually step in to halt acceleration at 155 mph. This range-topping engine also boasts extraordinary efficiency for a model in its output class, as average fuel consumption of 26.4 mpg and CO2 emissions of 249 grams per kilometre clearly show.
The six-cylinder in-line engine under the bonnet of the new BMW 640i Convertible complements its BMW TwinPower Turbo technology and petrol direct injection with VALVETRONIC fully variable valve control. All of which enables the 3.0-litre unit to develop a maximum 235 kW/320 hp at 5,800 rpm and maximum torque of 332 lb-ft between 1,300 and 4,500 rpm. This engine propels the BMW 640i Convertible from 0 to 62 mph in 5.7 seconds and on to an electronically limited top speed of 155 mph. Its average fuel economy in the EU test cycle comes in at 35.8 mpg imp, while CO2 emissions are 185 grams per kilometre.
Eight-speed Sports Automatic and BMW EfficientDynamics as Standard
The eight-speed Sports automatic gearbox fitted as standard in the new BMW 6 Series Convertible boasts a combination of sportiness, shift comfort and efficiency unmatched in its segment. Its minimal converter slip and rapid and precise gear changes set it apart from the crowd. An innovative gear set configuration allows this transmission to offer eight gears and a correspondingly wide gear range - which optimises the car's sprinting power yet also allows the driver to save fuel by driving at low revs - despite its compact construction and low weight. The driver can also change gear manually using shift paddles on the steering wheel.
In addition to the efficiency of the engines and eight-speed Sports automatic, an extensive range of BMW EfficientDynamics measures also contribute to reducing fuel consumption and emissions. Technology such as Brake Energy Regeneration, Electric Power Steering (EPS), the need-based operation of ancillary components, intelligent lightweight construction and low-rolling-resistance tyres ensure maximum efficiency. Plus, the new BMW 640i Convertible is also equipped with automatic active air flap control and the Auto Start-Stop function. When the driver draws to a standstill at junctions or in a traffic jam the engine is automatically switched off. As soon as the driver releases the brake pedal, the engine starts up again. If the driver is using the Auto Hold function, the engine is restarted when the accelerator is depressed.Published 24 January 2011