1971 Citroen SM vs. 2007 Opel Astra
To start off, 2007 Opel Astra is newer by 36 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, 2007 Opel Astra (197 HP @ 5400 RPM) has 39 more horse power than 1971 Citroen SM. (158 HP @ 5500 RPM) In normal driving conditions, 2007 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 65 kg more than 2007 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, 2007 Opel Astra (262 Nm @ 1950 RPM) has 27 more torque (in Nm) than 1971 Citroen SM. (235 Nm @ 4000 RPM). This means 2007 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 | 2007 Opel Astra | |
| Make | Citroen | Opel |
| Model | SM | Astra |
| Year Released | 1971 | 2007 |
| Engine Position | Front | Front |
| Engine Size | 2670 cc | 1998 cc |
| Engine Cylinders | 6 cylinders | 4 cylinders |
| Engine Type | V | in-line |
| Valves per Cylinder | 2 valves | 4 valves |
| Horse Power | 158 HP | 197 HP |
| Engine RPM | 5500 RPM | 5400 RPM |
| Torque | 235 Nm | 262 Nm |
| Torque RPM | 4000 RPM | 1950 RPM |
| Engine Bore Size | 87 mm | 86.1 mm |
| Engine Stroke Size | 75 mm | 86 mm |
| Fuel Type | Gasoline | Gasoline |
| Drive Type | Front | Front |
| Transmission Type | Manual | Manual |
| Number of Seats | 4 seats | 5 seats |
| Number of Doors | 2 doors | 2 doors |
| Vehicle Weight | 1450 kg | 1385 kg |
| Vehicle Length | 4900 mm | 4300 mm |
| Vehicle Width | 1850 mm | 1760 mm |
| Vehicle Height | 1330 mm | 1440 mm |
| Wheelbase Size | 2950 mm | 2620 mm |
| Fuel Tank Capacity | 89 L | 52 L |
