2007 BMW M6 vs. 1991 Ford Sierra
To start off, 2007 BMW M6 is newer by 16 year(s). Which means there will be less support and parts availability for 1991 Ford Sierra. In addition, the cost of maintenance, including insurance, on 1991 Ford Sierra would be higher. At 4,999 cc (10 cylinders), 2007 BMW M6 is equipped with a bigger engine. In terms of performance, 2007 BMW M6 (500 HP @ 7750 RPM) has 425 more horse power than 1991 Ford Sierra. (75 HP @ 4500 RPM). In normal driving conditions, 2007 BMW M6 should accelerate faster than 1991 Ford Sierra. With that said, vehicle weight also plays an important factor in acceleration. 2007 BMW M6 weights approximately 795 kg more than 1991 Ford Sierra. So despite on having greater horse power, its additional weight may have an impact towards its acceleration in comparison.
Let's talk about torque, 2007 BMW M6 (519 Nm @ 6100 RPM) has 367 more torque (in Nm) than 1991 Ford Sierra. (152 Nm @ 2200 RPM). This means 2007 BMW M6 will have an easier job in driving up hills or pulling heavy equipment than 1991 Ford Sierra.
Compare all specifications:
| 2007 BMW M6 | 1991 Ford Sierra | |
| Make | BMW | Ford |
| Model | M6 | Sierra |
| Year Released | 2007 | 1991 |
| Engine Position | Front | Front |
| Engine Size | 4999 cc | 1751 cc |
| Engine Cylinders | 10 cylinders | 4 cylinders |
| Engine Type | V | in-line |
| Horse Power | 500 HP | 75 HP |
| Engine RPM | 7750 RPM | 4500 RPM |
| Torque | 519 Nm | 152 Nm |
| Torque RPM | 6100 RPM | 2200 RPM |
| Engine Bore Size | 92 mm | 82.5 mm |
| Engine Stroke Size | 75.2 mm | 82 mm |
| Engine Compression Ratio | 12.0:1 | 21.5:1 |
| Fuel Type | Gasoline - Premium | Diesel |
| Number of Seats | 4 seats | 5 seats |
| Number of Doors | 2 doors | 4 doors |
| Vehicle Weight | 1940 kg | 1145 kg |
| Vehicle Length | 4880 mm | 4430 mm |
| Vehicle Width | 1860 mm | 1700 mm |
| Vehicle Height | 1380 mm | 1370 mm |
| Wheelbase Size | 2790 mm | 2620 mm |
| Fuel Tank Capacity | 70 L | 60 L |
