1963 AC Greyhound vs. 1973 Citroen SM
To start off, 1973 Citroen SM is newer by 10 year(s). Which means there will be less support and parts availability for 1963 AC Greyhound. In addition, the cost of maintenance, including insurance, on 1963 AC Greyhound 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 48 more horse power than 1963 AC Greyhound. (123 HP @ 5750 RPM) In normal driving conditions, 1973 Citroen SM should accelerate faster than 1963 AC Greyhound. With that said, vehicle weight also plays an important factor in acceleration. 1973 Citroen SM weights approximately 435 kg more than 1963 AC Greyhound. So despite on having greater horse power, its additional weight may have an impact towards its acceleration in comparison.
Let's talk about torque, 1973 Citroen SM (237 Nm) has 58 more torque (in Nm) than 1963 AC Greyhound. (179 Nm). This means 1973 Citroen SM will have an easier job in driving up hills or pulling heavy equipment than 1963 AC Greyhound.
Compare all specifications:
| 1963 AC Greyhound | 1973 Citroen SM | |
| Make | AC | Citroen |
| Model | Greyhound | SM |
| Year Released | 1963 | 1973 |
| Engine Position | Front | Front |
| Engine Size | 1971 cc | 2670 cc |
| Engine Cylinders | 6 cylinders | 6 cylinders |
| Engine Type | in-line | V |
| Valves per Cylinder | 2 valves | 2 valves |
| Horse Power | 123 HP | 171 HP |
| Engine RPM | 5750 RPM | 5500 RPM |
| Torque | 179 Nm | 237 Nm |
| Fuel Type | Gasoline | Gasoline |
| Number of Seats | 4 seats | 2 seats |
| Number of Doors | 2 doors | 2 doors |
| Vehicle Weight | 1015 kg | 1450 kg |
| Vehicle Length | 4580 mm | 4900 mm |
| Vehicle Width | 1670 mm | 1850 mm |
| Vehicle Height | 1340 mm | 1330 mm |
| Wheelbase Size | 2550 mm | 2960 mm |
| Fuel Tank Capacity | 54 L | 25 L |
