2004 Alfa Romeo 156 vs. 1991 Renault 21
To start off, 2004 Alfa Romeo 156 is newer by 13 year(s). Which means there will be less support and parts availability for 1991 Renault 21. In addition, the cost of maintenance, including insurance, on 1991 Renault 21 would be higher. At 1,910 cc (4 cylinders), 2004 Alfa Romeo 156 is equipped with a bigger engine. In terms of performance, 2004 Alfa Romeo 156 (148 HP @ 4000 RPM) has 73 more horse power than 1991 Renault 21. (75 HP @ 5000 RPM). In normal driving conditions, 2004 Alfa Romeo 156 should accelerate faster than 1991 Renault 21. With that said, vehicle weight also plays an important factor in acceleration. 2004 Alfa Romeo 156 weights approximately 505 kg more than 1991 Renault 21. So despite on having greater horse power, its additional weight may have an impact towards its acceleration in comparison.
Because 2004 Alfa Romeo 156 is four wheel drive (4WD), it will have significant more traction and grip than 1991 Renault 21. In wet, icy, snow, or gravel driving conditions, 2004 Alfa Romeo 156 will offer significantly more control. With that said, do keep in mind that many other factors such as speed and the wear on your tires can also have significant impact on traction and control. Let's talk about torque, 2004 Alfa Romeo 156 (300 Nm @ 2000 RPM) has 171 more torque (in Nm) than 1991 Renault 21. (129 Nm @ 3250 RPM). This means 2004 Alfa Romeo 156 will have an easier job in driving up hills or pulling heavy equipment than 1991 Renault 21.
Compare all specifications:
| 2004 Alfa Romeo 156 | 1991 Renault 21 | |
| Make | Alfa Romeo | Renault |
| Model | 156 | 21 |
| Year Released | 2004 | 1991 |
| Engine Position | Front | Front |
| Engine Size | 1910 cc | 1721 cc |
| Engine Cylinders | 4 cylinders | 4 cylinders |
| Engine Type | in-line | in-line |
| Valves per Cylinder | 4 valves | 2 valves |
| Horse Power | 148 HP | 75 HP |
| Engine RPM | 4000 RPM | 5000 RPM |
| Torque | 300 Nm | 129 Nm |
| Torque RPM | 2000 RPM | 3250 RPM |
| Engine Bore Size | 82 mm | 81 mm |
| Engine Stroke Size | 90.4 mm | 83.5 mm |
| Engine Compression Ratio | 18.5:1 | 9.2:1 |
| Fuel Type | Diesel | Gasoline |
| Drive Type | 4WD | Front |
| Transmission Type | Manual | Manual |
| Vehicle Weight | 1525 kg | 1020 kg |
| Vehicle Width | 1750 mm | 1720 mm |
| Vehicle Height | 1460 mm | 1430 mm |
| Wheelbase Size | 2600 mm | 2820 mm |
