Comparison BMW 6 Series (E24, facelift 1987) 635 CSi (220 Hp) Automatic & BMW 8 Series (E31) 840i 4.0 (286 Hp)
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| Brand: | BMW | BMW |
| Model: | 6 Series | 8 Series |
| Generation: | 6 Series (E24, facelift 1987) | 8 Series (E31) |
| Engine / modification: | 635 CSi (220 Hp) Automatic | 840i 4.0 (286 Hp) |
| Production start: | 1987 year | 1993 year |
| Production end: | 1989 year | 1996 year |
| Coupe type: | Coupe | Coupe |
| Num. of Doors: | 2 | 2 |
| Num. of seats: | 4 | 4 |
| Fuel consumption / economy - urban: | 16.9 l/100 km | 19.2 l/100 km |
| Fuel consumption / economy - extra urban: | 7.8 l/100 km | 9 l/100 km |
| Fuel consumption / economy - combined: | 11.5 l/100 km | |
| Fuel Type: | Petrol (Gasoline) | Petrol (Gasoline) |
| Drag coefficient: | 0.41 | |
| Fuel tank volume: | 70 l | 90 l |
| Power: | 220 hp | 286 hp |
| Max power in: | 5700 rpm. | 5800 rpm. |
| Maximum speed: | 225 km/h | 250 km/h |
| Acceleration from 0 to 100 km/h: | 8.4 sec | 6.9 sec |
| Torque: | 315 Nm @ 4000 rpm. | 400 Nm @ 4500 rpm. |
| Model Engine: | M30 | M60B40 |
| Engine position: | Front, longitudinal | Front, longitudinal |
| Engine displacement: | 3430 cm3 | 3982 cm3 |
| Engine oil capacity: | 5.8 l | 7.5 l |
| Coolant: | 12 l | 12.5 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: | 9.2 | 10 |
| Piston Stroke: | 86 mm | 80 mm |
| Cylinder Bore: | 92 mm | 89 mm |
| Wheel Drive: | Rear wheel drive | Rear wheel drive |
| Number of Gears (automatic transmission): | 4 | 5 |
| Number of Gears (manual transmission): | 6 | |
| Length: | 4815 mm | 4780 mm |
| Width: | 1725 mm | 1855 mm |
| Height: | 1365 mm | 1340 mm |
| Wheelbase: | 2625 mm | 2648 mm |
| Front track: | 1435 mm | 1554 mm |
| Rear (Back) track: | 1465 mm | 1562 mm |
| Minimum volume of Luggage (trunk): | 413 l | 320 l |
| Front suspension: | Independent, Spring McPherson, with stabilizer | Wishbone |
| Rear suspension: | Independent, spring | Helical spring |
| Max weight: | 1880 kg | 2180 kg |
| Front brakes: | Ventilated discs | Ventilated discs |
| Rear brakes: | Disc | Disc |
| Kerb Weight: | 1480 kg | 1780 kg |
| ABS: | yes | |
| Steering type: | Cone worm with recirculation balls | Steering rack and pinion |
| Power steering: | Hydraulic Steering | |
| Minimum turning circle (turning diameter): | 11.7 m | |
| Tire size: | 220/55 VR 390 | 235/50 R16 |
| Wheel rims size: | R16 |