2003 Alfa Romeo 156 vs. 1973 Citroen SM
To start off, 2003 Alfa Romeo 156 is newer by 30 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 9 more horse power than 2003 Alfa Romeo 156. (162 HP @ 6400 RPM) In normal driving conditions, 1973 Citroen SM should accelerate faster than 2003 Alfa Romeo 156. With that said, vehicle weight also plays an important factor in acceleration. 1973 Citroen SM weights approximately 70 kg more than 2003 Alfa Romeo 156. So despite on having greater horse power, its additional weight may have an impact towards its acceleration in comparison.
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 30 more torque (in Nm) than 2003 Alfa Romeo 156. (207 Nm @ 3250 RPM). This means 1973 Citroen SM will have an easier job in driving up hills or pulling heavy equipment than 2003 Alfa Romeo 156.
Compare all specifications:
| 2003 Alfa Romeo 156 | 1973 Citroen SM | |
| Make | Alfa Romeo | Citroen |
| Model | 156 | SM |
| Year Released | 2003 | 1973 |
| Body Type | Station Wagon | Coupe |
| Engine Position | Front | Front |
| Engine Size | 1910 cc | 2670 cc |
| Engine Cylinders | 4 cylinders | 6 cylinders |
| Engine Type | in-line | V |
| Horse Power | 162 HP | 171 HP |
| Engine RPM | 6400 RPM | 5500 RPM |
| Torque | 207 Nm | 237 Nm |
| Torque RPM | 3250 RPM | 4000 RPM |
| Engine Bore Size | 83 mm | 87 mm |
| Engine Stroke Size | 91 mm | 75 mm |
| Drive Type | Front | Front |
| Number of Seats | 5 seats | 2 seats |
| Number of Doors | 5 doors | 2 doors |
| Vehicle Weight | 1380 kg | 1450 kg |
| Vehicle Length | 4450 mm | 4900 mm |
| Vehicle Width | 1750 mm | 1850 mm |
| Vehicle Height | 1440 mm | 1330 mm |
| Wheelbase Size | 2550 mm | 2960 mm |
| Fuel Tank Capacity | 63 L | 25 L |
