Comparison BMW 6 Series (E24, facelift 1982) 635 CSi (218 Hp) Automatic & BMW 6 Series (E63) 645 Ci (333 Hp)
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| Brand: | BMW | BMW |
| Model: | 6 Series | 6 Series |
| Generation: | 6 Series (E24, facelift 1982) | 6 Series (E63) |
| Engine / modification: | 635 CSi (218 Hp) Automatic | 645 Ci (333 Hp) |
| Production start: | 1982 year | 2003 year |
| Production end: | 1987 year | 2005 year |
| Coupe type: | Coupe | Coupe |
| Num. of Doors: | 2 | 2 |
| Num. of seats: | 4 | 2+2 |
| Fuel consumption / economy - urban: | 14.8 l/100 km | 17.2 l/100 km |
| Fuel consumption / economy - extra urban: | 6.8 l/100 km | 8.6 l/100 km |
| Fuel consumption / economy - combined: | 10.1 l/100 km | 11.7 l/100 km |
| Fuel Type: | Petrol (Gasoline) | Petrol (Gasoline) |
| Drag coefficient: | 0.41 | 0.29 |
| Fuel tank volume: | 70 l | 70 l |
| Emission standard: | Euro 4 | |
| CO2 emissions: | 283 g/km | |
| Power: | 218 hp | 333 hp |
| Max power in: | 5200 rpm. | 6100 rpm. |
| Maximum speed: | 221 km/h | 250 km/h |
| Acceleration from 0 to 100 km/h: | 9.0 sec | 5.6 sec |
| Torque: | 310 Nm @ 4000 rpm. | 450 Nm @ 3600 rpm. |
| Model Engine: | M30 | N63B44 |
| Engine position: | Front, longitudinal | Front, longitudinal |
| Engine displacement: | 3430 cm3 | 4398 cm3 |
| Engine oil capacity: | 5.8 l | 8.0 l |
| Coolant: | 14.2 l | |
| Fuel System: | Multi-point injection | Multi-point injection |
| Position of cylinders: | Inline | V engine |
| Valvetrain: | DOHC | |
| Number of cylinders: | 6 | 8 |
| Number of valves per cylinder: | 2 | 4 |
| Compression ratio: | 10 | 10 |
| Piston Stroke: | 86 mm | 82.7 mm |
| Cylinder Bore: | 92 mm | 92 mm |
| Wheel Drive: | Rear wheel drive | Rear wheel drive |
| Number of Gears (automatic transmission): | 4 | |
| Number of Gears (manual transmission): | 6 | |
| Length: | 4755 mm | 4820 mm |
| Width: | 1725 mm | 1855 mm |
| Height: | 1365 mm | 1373 mm |
| Wheelbase: | 2625 mm | 2780 mm |
| Front track: | 1430 mm | 1558 mm |
| Rear (Back) track: | 1460 mm | 1592 mm |
| Minimum volume of Luggage (trunk): | 415 l | 450 l |
| Front suspension: | Independent, Spring McPherson, with stabilizer | Coil spring |
| Rear suspension: | Independent, spring | Helical spring |
| Max weight: | 1850 kg | 2065 kg |
| Front brakes: | Ventilated discs | Disc |
| Rear brakes: | Disc | Disc |
| Kerb Weight: | 1450 kg | 1690 kg |
| ABS: | yes | |
| Steering type: | Cone worm with recirculation balls | Steering rack and pinion |
| Power steering: | Hydraulic Steering | |
| Minimum turning circle (turning diameter): | 11.2 m | 11.4 m |
| Tire size: | 205/70 VR14 | 245/45 R18 |
| Wheel rims size: | R14 | 8J x 18 |