The BMW 650i Convertible (E64), specifically the facelifted version produced from 2007 to 2010, represented the pinnacle of open-air luxury and performance within the E64 6 Series range. Positioned as the flagship model, it offered a substantial step up in power and refinement compared to the 630i and 640i variants. This iteration of the 6 Series Convertible aimed to blend grand touring comfort with engaging driving dynamics, appealing to buyers seeking a sophisticated and powerful luxury vehicle. The E64 platform, sharing underpinnings with the E63 6 Series Coupe and the E90 5 Series, was BMW’s attempt to recapture the spirit of the original 6 Series while incorporating modern technology and design cues.
Technical Specifications
| Brand | BMW |
| Model | 6 Series |
| Generation | 6 Series Convertible (E64, facelift 2007) |
| Type (Engine) | 650i (367 Hp) |
| Start of production | 2007 |
| End of production | 2010 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Cabriolet |
| Seats | 4 |
| Doors | 2 |
| Fuel consumption (urban) | 19.2 l/100 km (12.3 US mpg, 14.7 UK mpg, 5.2 km/l) |
| Fuel consumption (extra urban) | 8.8 l/100 km (26.7 US mpg, 32.1 UK mpg, 11.4 km/l) |
| Fuel consumption (combined) | 12.6 l/100 km (18.7 US mpg, 22.4 UK mpg, 7.9 km/l) |
| CO2 emissions | 299 g/km |
| Fuel Type | Petrol (Gasoline) |
| Acceleration 0 – 100 km/h | 5.5 sec |
| Acceleration 0 – 62 mph | 5.5 sec |
| Acceleration 0 – 60 mph | 5.2 sec |
| Maximum speed | 250 km/h (155.34 mph) |
| Emission standard | Euro 4 |
| Weight-to-power ratio | 5.1 kg/Hp, 197.3 Hp/tonne |
| Weight-to-torque ratio | 3.8 kg/Nm, 263.4 Nm/tonne |
| Power | 367 Hp @ 6300 rpm |
| Power per litre | 76.5 Hp/l |
| Torque | 490 Nm @ 3400 rpm (361.41 lb.-ft. @ 3400 rpm) |
| Engine layout | Front, Longitudinal |
| Engine Model/Code | N62B48B |
| Engine displacement | 4799 cm3 (292.85 cu. in.) |
| Number of cylinders | 8 |
| Engine configuration | V-engine |
| Cylinder Bore | 93 mm (3.66 in.) |
| Piston Stroke | 88.3 mm (3.48 in.) |
| Compression ratio | 10.5:1 |
| Number of valves per cylinder | 4 |
| Fuel injection system | Multi-port manifold injection |
| Engine aspiration | Naturally aspirated engine |
| Engine oil capacity | 8 l (8.45 US qt | 7.04 UK qt) |
| Coolant | 13.8 l (14.58 US qt | 12.14 UK qt) |
| Kerb Weight | 1860 kg (4100.6 lbs.) |
| Max. weight | 2260 kg (4982.45 lbs.) |
| Max load | 400 kg (881.85 lbs.) |
| Trunk (boot) space – minimum | 300 l (10.59 cu. ft.) |
| Trunk (boot) space – maximum | 350 l (12.36 cu. ft.) |
| Fuel tank capacity | 70 l (18.49 US gal | 15.4 UK gal) |
| Length | 4820 mm (189.76 in.) |
| Width | 1855 mm (73.03 in.) |
| Height | 1374 mm (54.09 in.) |
| Wheelbase | 2780 mm (109.45 in.) |
| Front track | 1558 mm (61.34 in.) |
| Rear (Back) track | 1596 mm (62.83 in.) |
| Drag coefficient (Cd) | 0.31 |
| Minimum turning circle | 11.4 m (37.4 ft.) |
| Drivetrain Architecture | The Internal combustion engine (ICE) drives the rear wheels of the vehicle. |
| Drive wheel | Rear wheel drive |
| Number of gears | 6 |
| Type of gearbox | manual transmission |
| Front suspension | Double wishbone |
| Rear suspension | Independent multi-link suspension |
| Front brakes | Ventilated discs |
| Rear brakes | Ventilated discs |
| Assisting systems | ABS (Anti-lock braking system) |
| Steering type | Steering rack and pinion |
| Power steering | Hydraulic Steering |
| Tires size | 245/45 R18 96W RSC |
| Wheel rims size | 8 J x 18 |
Powertrain & Engine Architecture
The heart of the 650i Convertible was the N62B48B 4.8-liter naturally aspirated V8 engine. This engine, a descendant of BMW’s long-standing V8 tradition, featured all-aluminum construction, double-VANOS variable valve timing, and individual throttle butterflies. The N62 engine utilized a multi-port fuel injection system, delivering fuel directly into the intake ports. The 4.8L V8 produced 367 horsepower at 6300 rpm and 490 Nm (361 lb-ft) of torque at 3400 rpm. The engine’s architecture prioritized smooth power delivery and a characteristic V8 sound. The 6-speed manual transmission was standard, offering precise shifts and a direct connection to the engine. While an automatic transmission was available, the manual was favored by enthusiasts for its enhanced driving experience.
Driving Characteristics
The 650i Convertible with the manual transmission delivered a compelling grand touring experience. Acceleration from 0 to 60 mph took approximately 5.2 seconds, and the car felt strong and responsive throughout the rev range. The manual gearbox, while not particularly short-throw, provided a satisfying mechanical feel. The suspension, tuned for comfort, absorbed bumps effectively while maintaining reasonable body control. Compared to the 630i and 640i, the 650i offered a significantly more potent driving experience, with the V8 providing ample power for effortless cruising and spirited driving. The weight distribution, close to 50/50, contributed to balanced handling.
Equipment & Trim Levels
The 650i Convertible came standard with a generous array of features, including leather upholstery, power-adjustable seats with memory function, automatic climate control, a premium sound system, and BMW’s iDrive infotainment system. Optional extras included active steering, sport seats, upgraded leather trim, a head-up display, and a logic7 surround sound system. The convertible top was a multi-layer fabric design with full power operation and a wind deflector to reduce turbulence in the cabin. Interior trim options included various wood veneers and aluminum accents.
Chassis & Braking
The E64 6 Series Convertible utilized a double-wishbone front suspension and an independent multi-link rear suspension. This setup provided a good balance between ride comfort and handling precision. The 650i was equipped with ventilated disc brakes on all four wheels, providing ample stopping power. Anti-lock braking system (ABS) was standard, along with electronic brake-force distribution. The steering was a hydraulic rack-and-pinion system, offering precise and responsive feel.
Market Reception & Comparison
The 650i Convertible was generally well-received by automotive critics, who praised its powerful engine, luxurious interior, and refined driving experience. However, some critics noted the car’s relatively high price and complex iDrive system. Compared to the 630i and 640i, the 650i offered a significant performance advantage but came at a substantial price premium. Fuel economy was also considerably lower with the V8 engine. The 650i competed with other luxury convertibles such as the Mercedes-Benz SL-Class and the Porsche 911 Cabriolet.
Legacy
The N62B48B engine, while known for its smooth power delivery, has a reputation for potential cooling system issues, including water pump failures and thermostat problems. Oil leaks can also occur over time. However, with proper maintenance, the engine can be remarkably durable. The E64 6 Series Convertible, particularly the 650i variant, has become a desirable modern classic, appreciated for its elegant styling and powerful engine. Well-maintained examples command a premium in the used car market, appealing to enthusiasts seeking a luxurious and engaging grand touring experience.
