1991 Audi S2 vs. 1970 Riley 4
To start off, 1991 Audi S2 is newer by 21 year(s). Which means there will be less support and parts availability for 1970 Riley 4. In addition, the cost of maintenance, including insurance, on 1970 Riley 4 would be higher. At 2,226 cc (5 cylinders), 1991 Audi S2 is equipped with a bigger engine. In terms of performance, 1991 Audi S2 (216 HP @ 5900 RPM) has 149 more horse power than 1970 Riley 4. (67 HP @ 5000 RPM). In normal driving conditions, 1991 Audi S2 should accelerate faster than 1970 Riley 4. With that said, vehicle weight also plays an important factor in acceleration. 1991 Audi S2 weights approximately 272 kg more than 1970 Riley 4. So despite on having greater horse power, its additional weight may have an impact towards its acceleration in comparison.
Because 1991 Audi S2 is four wheel drive (4WD), it will have significant more traction and grip than 1970 Riley 4. In wet, icy, snow, or gravel driving conditions, 1991 Audi S2 will offer significantly more control. 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, 1991 Audi S2 (309 Nm @ 1950 RPM) has 189 more torque (in Nm) than 1970 Riley 4. (120 Nm @ 2500 RPM). This means 1991 Audi S2 will have an easier job in driving up hills or pulling heavy equipment than 1970 Riley 4.
Compare all specifications:
| 1991 Audi S2 | 1970 Riley 4 | |
| Make | Audi | Riley |
| Model | S2 | 4 |
| Year Released | 1991 | 1970 |
| Engine Position | Front | Front |
| Engine Size | 2226 cc | 1622 cc |
| Engine Cylinders | 5 cylinders | 4 cylinders |
| Engine Type | in-line | in-line |
| Horse Power | 216 HP | 67 HP |
| Engine RPM | 5900 RPM | 5000 RPM |
| Torque | 309 Nm | 120 Nm |
| Torque RPM | 1950 RPM | 2500 RPM |
| Engine Bore Size | 81.1 mm | 76.2 mm |
| Engine Stroke Size | 86.4 mm | 88.9 mm |
| Engine Compression Ratio | 9.3:1 | 8.3:1 |
| Drive Type | 4WD | Rear |
| Number of Seats | 4 seats | 5 seats |
| Number of Doors | 2 doors | 4 doors |
| Vehicle Weight | 1420 kg | 1148 kg |
| Vehicle Length | 4410 mm | 4540 mm |
| Vehicle Width | 1720 mm | 1620 mm |
| Vehicle Height | 1380 mm | 1510 mm |
| Wheelbase Size | 2560 mm | 2530 mm |
| Fuel Tank Capacity | 70 L | 45 L |
