Comparison Buick Regal II Coupe (facelift 1981) 3.8 V6 (177 Hp) Automatic & Rolls-Royce Dawn 6.6 V12 (571 Hp) Automatic
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| Brand: | Buick | Rolls-Royce |
| Model: | Regal | Dawn |
| Generation: | Regal II Coupe (facelift 1981) | Dawn |
| Engine / modification: | 3.8 V6 (177 Hp) Automatic | 6.6 V12 (571 Hp) Automatic |
| Production start: | 1981 year | 2016 year |
| Production end: | 1987 year | |
| Coupe type: | Coupe | Cabriolet |
| Num. of Doors: | 2 | 2 |
| Num. of seats: | 5 | 4 |
| Fuel consumption / economy - urban: | 13.1 l/100 km | 22.1 l/100 km |
| Fuel consumption / economy - extra urban: | 9.4 l/100 km | 10.0 l/100 km |
| Fuel consumption / economy - combined: | 11.2 l/100 km | 14.4 l/100 km |
| Fuel Type: | Petrol (Gasoline) | Petrol (Gasoline) |
| Drag coefficient: | 0.45 | |
| Fuel tank volume: | 68 l | |
| CO2 emissions: | 330 g/km | |
| Power: | 177 hp | 571 hp |
| Max power in: | 4000 rpm. | 5250-6000 rpm. |
| Maximum speed: | 250 km/h | |
| Acceleration from 0 to 100 km/h: | 5.0 sec | |
| Torque: | 373 Nm @ 2600 rpm. | 820 Nm/1500-5000 rpm. |
| Model Engine: | LD5/LC6 | |
| Engine position: | Front, longitudinal | Front, longitudinal |
| Engine displacement: | 3791 cm3 | 6592 cm3 |
| Engine oil capacity: | 4.7 l | |
| Coolant: | 12.5 l | |
| Fuel System: | Carburettor | Direct injection |
| Aspiration / Turbine: | Turbocharger | |
| Position of cylinders: | V engine | V engine |
| Valvetrain: | OHV | |
| Number of cylinders: | 6 | 12 |
| Number of valves per cylinder: | 2 | 4 |
| Compression ratio: | 8 | |
| Piston Stroke: | 86.36 mm | |
| Cylinder Bore: | 96.52 mm | |
| Wheel Drive: | Rear wheel drive | Rear wheel drive |
| Number of Gears (automatic transmission): | 3 Hydramatic | 8 |
| Length: | 5095 mm | 5285 mm |
| Width: | 1819 mm | 1947 mm |
| Height: | 1374 mm | 1502 mm |
| Wheelbase: | 2746 mm | 3112 mm |
| Front track: | 1486 mm | |
| Rear (Back) track: | 1468 mm | |
| Minimum volume of Luggage (trunk): | 459 l | |
| Front suspension: | Independent, spring | |
| Rear suspension: | Suspension De-Dion | |
| Front brakes: | Ventilated discs | Ventilated discs |
| Rear brakes: | Drum | Ventilated discs |
| Kerb Weight: | 1503 kg | 2560 kg |
| ABS: | yes | |
| Steering type: | Cone worm with recirculation balls | Steering rack and pinion |
| Power steering: | Electric Steering | |
| Minimum turning circle (turning diameter): | 12.8 m | |
| Tire size: | 205/70 R14 | |
| Wheel rims size: | R14 |