2006 Alfa Romeo 156 vs. 1973 Citroen SM
To start off, 2006 Alfa Romeo 156 is newer by 33 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 2,670 cc (6 cylinders), 1973 Citroen SM is equipped with a bigger engine. In terms of performance, 1973 Citroen SM (171 HP @ 5500 RPM) has 23 more horse power than 2006 Alfa Romeo 156. (148 HP @ 6300 RPM) In normal driving conditions, 1973 Citroen SM should accelerate faster than 2006 Alfa Romeo 156. With that said, vehicle weight also plays an important factor in acceleration. 2006 Alfa Romeo 156 weights approximately 135 kg more than 1973 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, 1973 Citroen SM (237 Nm @ 4000 RPM) has 56 more torque (in Nm) than 2006 Alfa Romeo 156. (181 Nm @ 3800 RPM). This means 1973 Citroen SM will have an easier job in driving up hills or pulling heavy equipment than 2006 Alfa Romeo 156.
Compare all specifications:
| 2006 Alfa Romeo 156 | 1973 Citroen SM | |
| Make | Alfa Romeo | Citroen |
| Model | 156 | SM |
| Year Released | 2006 | 1973 |
| Body Type | Sedan | Coupe |
| Engine Position | Front | Front |
| Engine Size | 1970 cc | 2670 cc |
| Engine Cylinders | 4 cylinders | 6 cylinders |
| Engine Type | in-line | V |
| Valves per Cylinder | 4 valves | 2 valves |
| Horse Power | 148 HP | 171 HP |
| Engine RPM | 6300 RPM | 5500 RPM |
| Torque | 181 Nm | 237 Nm |
| Torque RPM | 3800 RPM | 4000 RPM |
| Engine Bore Size | 83 mm | 87 mm |
| Engine Stroke Size | 91 mm | 75 mm |
| Engine Compression Ratio | 10.0:1 | 9.0:1 |
| Fuel Type | Gasoline | Gasoline |
| Drive Type | Front | Front |
| Number of Seats | 5 seats | 2 seats |
| Number of Doors | 4 doors | 2 doors |
| Vehicle Weight | 1585 kg | 1450 kg |
| Vehicle Length | 4440 mm | 4900 mm |
| Vehicle Width | 1750 mm | 1850 mm |
| Vehicle Height | 1440 mm | 1330 mm |
| Wheelbase Size | 2600 mm | 2960 mm |
| Fuel Tank Capacity | 63 L | 25 L |
