1971 Citroen SM vs. 2009 Citroen C4
To start off, 2009 Citroen C4 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 50 more horse power than 2009 Citroen C4. (108 HP @ 4000 RPM). In normal driving conditions, 1971 Citroen SM should accelerate faster than 2009 Citroen C4. With that said, vehicle weight also plays an important factor in acceleration. 2009 Citroen C4 weights approximately 164 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, 2009 Citroen C4 (240 Nm @ 1750 RPM) has 5 more torque (in Nm) than 1971 Citroen SM. (235 Nm @ 4000 RPM). This means 2009 Citroen C4 will have an easier job in driving up hills or pulling heavy equipment than 1971 Citroen SM. 2009 Citroen C4 has automatic transmission and 1971 Citroen SM has manual transmission. 1971 Citroen SM will offer better control over acceleration and deceleration in addition to better fuel efficiency overall. 2009 Citroen C4 will be easier to drive especially in heavy traffic.
Compare all specifications:
| 1971 Citroen SM | 2009 Citroen C4 | |
| Make | Citroen | Citroen |
| Model | SM | C4 |
| Year Released | 1971 | 2009 |
| Body Type | Coupe | Minivan |
| Engine Position | Front | Front |
| Engine Size | 2670 cc | 1560 cc |
| Engine Cylinders | 6 cylinders | 4 cylinders |
| Engine Type | V | in-line |
| Valves per Cylinder | 2 valves | 4 valves |
| Horse Power | 158 HP | 108 HP |
| Engine RPM | 5500 RPM | 4000 RPM |
| Torque | 235 Nm | 240 Nm |
| Torque RPM | 4000 RPM | 1750 RPM |
| Engine Bore Size | 87 mm | 75 mm |
| Engine Stroke Size | 75 mm | 88 mm |
| Fuel Type | Gasoline | Diesel |
| Drive Type | Front | Front |
| Transmission Type | Manual | Automatic |
| Number of Seats | 4 seats | 5 seats |
| Number of Doors | 2 doors | 5 doors |
| Vehicle Weight | 1450 kg | 1614 kg |
| Vehicle Length | 4900 mm | 4590 mm |
| Vehicle Width | 1850 mm | 1840 mm |
| Vehicle Height | 1330 mm | 1630 mm |
| Wheelbase Size | 2950 mm | 2730 mm |
| Fuel Tank Capacity | 89 L | 60 L |
