2005 Alfa Romeo 156 vs. 1973 Citroen SM
To start off, 2005 Alfa Romeo 156 is newer by 32 year(s). Which means there will be less support and parts availability for 1973 Citroen SM. In addition, the cost of maintenance, including insurance, on 1973 Citroen SM would be higher. At 3,179 cc (6 cylinders), 2005 Alfa Romeo 156 is equipped with a bigger engine. In terms of performance, 2005 Alfa Romeo 156 (247 HP @ 6200 RPM) has 76 more horse power than 1973 Citroen SM. (171 HP @ 5500 RPM). In normal driving conditions, 2005 Alfa Romeo 156 should accelerate faster than 1973 Citroen SM. With that said, vehicle weight also plays an important factor in acceleration. 1973 Citroen SM weights approximately 40 kg more than 2005 Alfa Romeo 156.
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, 2005 Alfa Romeo 156 (305 Nm @ 4800 RPM) has 68 more torque (in Nm) than 1973 Citroen SM. (237 Nm @ 4000 RPM). This means 2005 Alfa Romeo 156 will have an easier job in driving up hills or pulling heavy equipment than 1973 Citroen SM.
Compare all specifications:
| 2005 Alfa Romeo 156 | 1973 Citroen SM | |
| Make | Alfa Romeo | Citroen |
| Model | 156 | SM |
| Year Released | 2005 | 1973 |
| Body Type | Sedan | Coupe |
| Engine Position | Front | Front |
| Engine Size | 3179 cc | 2670 cc |
| Engine Cylinders | 6 cylinders | 6 cylinders |
| Engine Type | V | V |
| Valves per Cylinder | 4 valves | 2 valves |
| Horse Power | 247 HP | 171 HP |
| Engine RPM | 6200 RPM | 5500 RPM |
| Torque | 305 Nm | 237 Nm |
| Torque RPM | 4800 RPM | 4000 RPM |
| Engine Bore Size | 93 mm | 87 mm |
| Engine Stroke Size | 78 mm | 75 mm |
| Engine Compression Ratio | 10.5:1 | 9.0:1 |
| Drive Type | Front | Front |
| Number of Seats | 5 seats | 2 seats |
| Number of Doors | 4 doors | 2 doors |
| Vehicle Weight | 1410 kg | 1450 kg |
| Vehicle Length | 4440 mm | 4900 mm |
| Vehicle Width | 1770 mm | 1850 mm |
| Vehicle Height | 1410 mm | 1330 mm |
| Wheelbase Size | 2600 mm | 2960 mm |
| Fuel Tank Capacity | 63 L | 25 L |
