1971 Citroen SM vs. 2004 Opel Astra
To start off, 2004 Opel Astra is newer by 33 year(s). Which means there will be less support and parts availability for 1971 Citroen SM. In addition, the cost of maintenance, including insurance, on 1971 Citroen SM would be higher. At 2,670 cc (6 cylinders), 1971 Citroen SM is equipped with a bigger engine. In terms of performance, 2004 Opel Astra (168 HP @ 5200 RPM) has 10 more horse power than 1971 Citroen SM. (158 HP @ 5500 RPM) In normal driving conditions, 2004 Opel Astra should accelerate faster than 1971 Citroen SM. With that said, vehicle weight also plays an important factor in acceleration. 1971 Citroen SM weights approximately 25 kg more than 2004 Opel Astra.
Both vehicles are front wheel drive (FWD). Which offers better traction when its slippery than rear wheel drive vehicles. 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 Opel Astra (241 Nm @ 1950 RPM) has 6 more torque (in Nm) than 1971 Citroen SM. (235 Nm @ 4000 RPM). This means 2004 Opel Astra will have an easier job in driving up hills or pulling heavy equipment than 1971 Citroen SM.
Compare all specifications:
| 1971 Citroen SM | 2004 Opel Astra | |
| Make | Citroen | Opel |
| Model | SM | Astra |
| Year Released | 1971 | 2004 |
| Body Type | Coupe | Station Wagon |
| Engine Position | Front | Front |
| Engine Size | 2670 cc | 1979 cc |
| Engine Cylinders | 6 cylinders | 4 cylinders |
| Engine Type | V | in-line |
| Valves per Cylinder | 2 valves | 4 valves |
| Horse Power | 158 HP | 168 HP |
| Engine RPM | 5500 RPM | 5200 RPM |
| Torque | 235 Nm | 241 Nm |
| Torque RPM | 4000 RPM | 1950 RPM |
| Engine Bore Size | 87 mm | 86 mm |
| Engine Stroke Size | 75 mm | 86 mm |
| Drive Type | Front | Front |
| Transmission Type | Manual | Manual |
| Number of Seats | 4 seats | 5 seats |
| Number of Doors | 2 doors | 5 doors |
| Vehicle Weight | 1450 kg | 1425 kg |
| Vehicle Length | 4900 mm | 4520 mm |
| Vehicle Width | 1850 mm | 1800 mm |
| Vehicle Height | 1330 mm | 1510 mm |
| Wheelbase Size | 2950 mm | 2620 mm |
| Fuel Tank Capacity | 89 L | 52 L |
