1971 BMW 3 vs. 1991 Ford Sierra
To start off, 1991 Ford Sierra is newer by 20 year(s). Which means there will be less support and parts availability for 1971 BMW 3. In addition, the cost of maintenance, including insurance, on 1971 BMW 3 would be higher. At 2,986 cc (6 cylinders), 1971 BMW 3 is equipped with a bigger engine. In terms of performance, 1971 BMW 3 (200 HP @ 6000 RPM) has 125 more horse power than 1991 Ford Sierra. (75 HP @ 4500 RPM). In normal driving conditions, 1971 BMW 3 should accelerate faster than 1991 Ford Sierra. With that said, vehicle weight also plays an important factor in acceleration. 1971 BMW 3 weights approximately 235 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, 1971 BMW 3 (271 Nm @ 3700 RPM) has 119 more torque (in Nm) than 1991 Ford Sierra. (152 Nm @ 2200 RPM). This means 1971 BMW 3 will have an easier job in driving up hills or pulling heavy equipment than 1991 Ford Sierra.
Compare all specifications:
| 1971 BMW 3 | 1991 Ford Sierra | |
| Make | BMW | Ford |
| Model | 3 | Sierra |
| Year Released | 1971 | 1991 |
| Engine Position | Front | Front |
| Engine Size | 2986 cc | 1751 cc |
| Engine Cylinders | 6 cylinders | 4 cylinders |
| Engine Type | in-line | in-line |
| Horse Power | 200 HP | 75 HP |
| Engine RPM | 6000 RPM | 4500 RPM |
| Torque | 271 Nm | 152 Nm |
| Torque RPM | 3700 RPM | 2200 RPM |
| Engine Compression Ratio | 9.5:1 | 21.5:1 |
| Number of Seats | 5 seats | 5 seats |
| Number of Doors | 4 doors | 4 doors |
| Vehicle Weight | 1380 kg | 1145 kg |
| Vehicle Length | 4720 mm | 4430 mm |
| Vehicle Width | 1760 mm | 1700 mm |
| Vehicle Height | 1460 mm | 1370 mm |
| Wheelbase Size | 2700 mm | 2620 mm |
| Fuel Tank Capacity | 75 L | 60 L |
