2006 Ford Expedition vs. 1991 Ford Sierra
To start off, 2006 Ford Expedition is newer by 15 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 5,408 cc (8 cylinders), 2006 Ford Expedition is equipped with a bigger engine. In terms of performance, 2006 Ford Expedition (300 HP @ 5000 RPM) has 225 more horse power than 1991 Ford Sierra. (75 HP @ 4500 RPM). In normal driving conditions, 2006 Ford Expedition should accelerate faster than 1991 Ford Sierra. With that said, vehicle weight also plays an important factor in acceleration. 2006 Ford Expedition weights approximately 570 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, 2006 Ford Expedition (495 Nm @ 3750 RPM) has 343 more torque (in Nm) than 1991 Ford Sierra. (152 Nm @ 2200 RPM). This means 2006 Ford Expedition will have an easier job in driving up hills or pulling heavy equipment than 1991 Ford Sierra.
Compare all specifications:
| 2006 Ford Expedition | 1991 Ford Sierra | |
| Make | Ford | Ford |
| Model | Expedition | Sierra |
| Year Released | 2006 | 1991 |
| Engine Position | Front | Front |
| Engine Size | 5408 cc | 1751 cc |
| Engine Cylinders | 8 cylinders | 4 cylinders |
| Engine Type | V | in-line |
| Horse Power | 300 HP | 75 HP |
| Engine RPM | 5000 RPM | 4500 RPM |
| Torque | 495 Nm | 152 Nm |
| Torque RPM | 3750 RPM | 2200 RPM |
| Engine Bore Size | 90 mm | 82.5 mm |
| Engine Stroke Size | 106 mm | 82 mm |
| Engine Compression Ratio | 9.0:1 | 21.5:1 |
| Fuel Type | Gasoline | Diesel |
| Number of Seats | 9 seats | 5 seats |
| Number of Doors | 5 doors | 4 doors |
| Vehicle Weight | 1715 kg | 1145 kg |
| Vehicle Length | 5230 mm | 4430 mm |
| Vehicle Width | 2010 mm | 1700 mm |
| Vehicle Height | 1950 mm | 1370 mm |
| Wheelbase Size | 3030 mm | 2620 mm |
| Fuel Tank Capacity | 106 L | 60 L |
