1971 Citroen SM vs. 2009 Opel Astra
To start off, 2009 Opel Astra is newer by 38 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, 1971 Citroen SM (158 HP @ 5500 RPM) has 19 more horse power than 2009 Opel Astra. (139 HP @ 5600 RPM). In normal driving conditions, 1971 Citroen SM should accelerate faster than 2009 Opel Astra. With that said, vehicle weight also plays an important factor in acceleration. 2009 Opel Astra weights approximately 175 kg more than 1971 Citroen SM.
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, 1971 Citroen SM (235 Nm @ 4000 RPM) has 60 more torque (in Nm) than 2009 Opel Astra. (175 Nm @ 3800 RPM). This means 1971 Citroen SM will have an easier job in driving up hills or pulling heavy equipment than 2009 Opel Astra.
Compare all specifications:
| 1971 Citroen SM | 2009 Opel Astra | |
| Make | Citroen | Opel |
| Model | SM | Astra |
| Year Released | 1971 | 2009 |
| Engine Position | Front | Front |
| Engine Size | 2670 cc | 1796 cc |
| Engine Cylinders | 6 cylinders | 4 cylinders |
| Engine Type | V | in-line |
| Valves per Cylinder | 2 valves | 4 valves |
| Horse Power | 158 HP | 139 HP |
| Engine RPM | 5500 RPM | 5600 RPM |
| Torque | 235 Nm | 175 Nm |
| Torque RPM | 4000 RPM | 3800 RPM |
| Engine Bore Size | 87 mm | 80.5 mm |
| Engine Stroke Size | 75 mm | 88.2 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 | 5 doors |
| Vehicle Weight | 1450 kg | 1625 kg |
| Vehicle Length | 4900 mm | 4260 mm |
| Vehicle Width | 1850 mm | 1760 mm |
| Vehicle Height | 1330 mm | 1470 mm |
| Wheelbase Size | 2950 mm | 2620 mm |
| Fuel Tank Capacity | 89 L | 52 L |
