2006 Ford Focus vs. 1991 Ford Sierra
To start off, 2006 Ford Focus 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 1,751 cc (4 cylinders), 1991 Ford Sierra is equipped with a bigger engine. In terms of performance, 2006 Ford Focus (104 HP @ 6000 RPM) has 29 more horse power than 1991 Ford Sierra. (75 HP @ 4500 RPM). In normal driving conditions, 2006 Ford Focus should accelerate faster than 1991 Ford Sierra. With that said, vehicle weight also plays an important factor in acceleration. 2006 Ford Focus weights approximately 1711 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, 1991 Ford Sierra (152 Nm @ 2200 RPM) has 7 more torque (in Nm) than 2006 Ford Focus. (145 Nm @ 4000 RPM). This means 1991 Ford Sierra will have an easier job in driving up hills or pulling heavy equipment than 2006 Ford Focus.
Compare all specifications:
| 2006 Ford Focus | 1991 Ford Sierra | |
| Make | Ford | Ford |
| Model | Focus | Sierra |
| Year Released | 2006 | 1991 |
| Engine Position | Front | Front |
| Engine Size | 1594 cc | 1751 cc |
| Engine Cylinders | 4 cylinders | 4 cylinders |
| Engine Type | in-line | in-line |
| Horse Power | 104 HP | 75 HP |
| Engine RPM | 6000 RPM | 4500 RPM |
| Torque | 145 Nm | 152 Nm |
| Torque RPM | 4000 RPM | 2200 RPM |
| Engine Bore Size | 78 mm | 82.5 mm |
| Engine Stroke Size | 83.6 mm | 82 mm |
| Engine Compression Ratio | 10.8:1 | 21.5:1 |
| Fuel Type | Gasoline | Diesel |
| Number of Seats | 5 seats | 5 seats |
| Number of Doors | 5 doors | 4 doors |
| Vehicle Weight | 2856 kg | 1145 kg |
| Vehicle Length | 4350 mm | 4430 mm |
| Vehicle Width | 2000 mm | 1700 mm |
| Vehicle Height | 1450 mm | 1370 mm |
| Wheelbase Size | 2650 mm | 2620 mm |
| Fuel Tank Capacity | 55 L | 60 L |
