The BMW 6 Series Convertible (F12) 650i V8, produced from 2011 to 2012, represented the high-performance end of the F12 convertible range. Positioned as the flagship model, it offered a significant step up in power and luxury compared to the 640i variants. Built on the F12 platform, this generation of the 6 Series aimed to blend grand touring comfort with engaging driving dynamics, appealing to buyers seeking a sophisticated open-top experience. The 650i V8 was primarily marketed towards affluent customers in North America, Europe, and Asia who desired a powerful and luxurious convertible.
Technical Specifications
| Brand | BMW |
| Model | 6 Series |
| Generation | 6 Series Convertible (F12) |
| Type (Engine) | 650i V8 (400 Hp) |
| Start of production | 2011 |
| End of production | 2012 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Cabriolet |
| Seats | 4 |
| Doors | 2 |
| Fuel consumption (economy) – urban (EPA) | 15.7 l/100 km (15 US mpg, 18 UK mpg, 6.4 km/l) |
| Fuel consumption (economy) – extra urban (EPA) | 10.7 l/100 km (22 US mpg, 26.4 UK mpg, 9.3 km/l) |
| Fuel consumption (economy) – combined (EPA) | 13.8 l/100 km (17 US mpg, 20.5 UK mpg, 7.2 km/l) |
| Fuel Type | Petrol (Gasoline) |
| Acceleration 0 – 100 km/h | 5.1 sec |
| Acceleration 0 – 62 mph | 5.1 sec |
| Acceleration 0 – 60 mph | 4.9 sec |
| Maximum speed | 210 km/h (130.49 mph), Electronically limited |
| Weight-to-power ratio | 5.1 kg/Hp, 196.1 Hp/tonne |
| Weight-to-torque ratio | 3.3 kg/Nm, 299 Nm/tonne |
| Power | 400 Hp @ 5500-6400 rpm |
| Power per litre | 91 Hp/l |
| Torque | 610 Nm @ 1750-4500 rpm (449.91 lb.-ft. @ 1750-4500 rpm) |
| Engine layout | Front, Longitudinal |
| Engine Model/Code | N63B44O0 |
| Engine displacement | 4395 cm3 (268.2 cu. in.) |
| Number of cylinders | 8 |
| Engine configuration | V-engine |
| Cylinder Bore | 89 mm (3.5 in.) |
| Piston Stroke | 88.3 mm (3.48 in.) |
| Compression ratio | 10:1 |
| Number of valves per cylinder | 4 |
| Fuel injection system | Direct injection |
| Engine aspiration | 2 x Twin-scroll turbo, Intercooler |
| Valvetrain | Double-VANOS |
| Engine oil capacity | 8.5 l (8.98 US qt | 7.48 UK qt) |
| Coolant | 11.4 l (12.05 US qt | 10.03 UK qt) |
| Kerb Weight | 2040-2055 kg (4497.43 – 4530.5 lbs.) |
| Max. weight | 2450 kg (5401.33 lbs.) |
| Max load | 395-410 kg (870.83 – 903.9 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 | 4896 mm (192.76 in.) |
| Width | 1894 mm (74.57 in.) |
| Width including mirrors | 2081 mm (81.93 in.) |
| Height | 1365 mm (53.74 in.) |
| Wheelbase | 2855 mm (112.4 in.) |
| Front track | 1594 mm (62.76 in.) |
| Rear (Back) track | 1651 mm (65 in.) |
| Front overhang | 942 mm (37.09 in.) |
| Rear overhang | 1100 mm (43.31 in.) |
| Ride height (ground clearance) | 123 mm (4.84 in.) |
| Drag coefficient (Cd) | 0.32 |
| Minimum turning circle (turning diameter) | 11.7 m (38.39 ft.) |
| Drivetrain Architecture | The Internal combustion engine (ICE) drives the rear wheels of the vehicle. |
| Drive wheel | Rear wheel drive |
| Number of gears and type of gearbox | 6 gears, manual transmission |
| Front suspension | Coil spring, Double wishbone, Transverse stabilizer |
| Rear suspension | Independent multi-link spring suspension with stabilizer |
| Front brakes | Ventilated discs, 348 mm |
| Rear brakes | Ventilated discs, 345 mm |
| Assisting systems | ABS (Anti-lock braking system) |
| Steering type | Steering rack and pinion |
| Power steering | Electric Steering |
| Tires size | Front wheel tires: 245/40 R19; 245/35 R20 Rear wheel tires: 245/40 R19; 275/30 R20 |
| Wheel rims size | Front wheel rims: 8.5J x 19; 8.5J x 20 Rear wheel rims: 8.5J x 19; 9J x 20 |
Powertrain & Engine Architecture
The heart of the 650i V8 is BMW’s N63B44O0 engine, a 4.4-liter twin-turbocharged V8. This engine utilizes direct fuel injection and BMW’s Double-VANOS variable valve timing system for both intake and exhaust valves. The twin-scroll turbochargers are designed to minimize turbo lag and provide a broad torque curve. The engine produces 400 horsepower at 5,500-6,400 rpm and a substantial 610 Nm (449.91 lb-ft) of torque between 1,750 and 4,500 rpm. The F12 650i was exclusively offered with a 6-speed manual transmission, providing a more engaging driving experience compared to the automatic options available in other 6 Series models.
Driving Characteristics
The 650i V8 with the 6-speed manual transmission delivers exhilarating performance. The combination of the powerful V8 engine and the manual gearbox allows for precise control and a direct connection to the drivetrain. Acceleration from 0 to 60 mph takes approximately 4.9 seconds, and the electronically limited top speed is 210 km/h (130.49 mph). The gear ratios are well-matched to the engine’s torque curve, providing strong acceleration in any gear. Compared to the 640i models, the 650i offers a significantly more responsive and engaging driving experience, particularly for enthusiasts who prefer a manual transmission.
Equipment & Trim Levels
The 650i V8 came standard with a high level of equipment, including leather upholstery, power-adjustable seats with memory function, a premium sound system, automatic climate control, and a navigation system. Optional extras included features like active steering, adaptive suspension, and various interior trim options. The interior design emphasized luxury and comfort, with high-quality materials and meticulous attention to detail. The convertible top was fully automatic and could be operated at speeds up to 40 km/h (25 mph).
Chassis & Braking
The F12 6 Series Convertible features a sophisticated chassis with a double-wishbone front suspension and an independent multi-link rear suspension. Both ends of the suspension incorporate a stabilizer bar to reduce body roll. The 650i V8 was equipped with ventilated disc brakes on all four wheels, providing ample stopping power. The ABS (Anti-lock Braking System) and electronic stability control systems enhance safety and control. The steering system is a rack-and-pinion type with electric power assistance.
Market Reception & Comparison
The 650i V8 was generally well-received by automotive critics, who praised its powerful engine, engaging driving dynamics, and luxurious interior. However, some reviewers noted the relatively high fuel consumption and the complexity of the engine. Compared to the 640i models, the 650i offered a significant performance advantage but came at a higher price point. The manual transmission was particularly appreciated by driving enthusiasts, setting it apart from the more common automatic options in the luxury convertible segment.
Legacy
The N63B44O0 engine, while powerful, has been known to require diligent maintenance, particularly regarding cooling system components and turbocharger health. Early versions of the N63 engine experienced some issues with oil leaks and cooling system failures, but these were largely addressed in later revisions. Today, well-maintained 650i V8 convertibles are sought after by collectors and enthusiasts who appreciate their combination of performance, luxury, and exclusivity. The manual transmission version is particularly desirable, adding to its collectibility. The F12 650i V8 remains a compelling grand tourer, offering a unique driving experience that blends BMW’s engineering prowess with open-top motoring enjoyment.
