2006 BMW Z4 vs. 1971 Riley 4
To start off, 2006 BMW Z4 is newer by 35 year(s). Which means there will be less support and parts availability for 1971 Riley 4. In addition, the cost of maintenance, including insurance, on 1971 Riley 4 would be higher. At 2,492 cc (6 cylinders), 2006 BMW Z4 is equipped with a bigger engine. In terms of performance, 2006 BMW Z4 (189 HP @ 6000 RPM) has 122 more horse power than 1971 Riley 4. (67 HP @ 5000 RPM). In normal driving conditions, 2006 BMW Z4 should accelerate faster than 1971 Riley 4. With that said, vehicle weight also plays an important factor in acceleration. 2006 BMW Z4 weights approximately 187 kg more than 1971 Riley 4. So despite on having greater horse power, its additional weight may have an impact towards its acceleration in comparison.
Both vehicles are rear wheel drive (RWD) - it offers better handling in dry conditions; in addition, if you are looking to drift, both vehicles do the job better than front 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, 2006 BMW Z4 (245 Nm @ 3500 RPM) has 124 more torque (in Nm) than 1971 Riley 4. (121 Nm @ 2500 RPM). This means 2006 BMW Z4 will have an easier job in driving up hills or pulling heavy equipment than 1971 Riley 4.
Compare all specifications:
| 2006 BMW Z4 | 1971 Riley 4 | |
| Make | BMW | Riley |
| Model | Z4 | 4 |
| Year Released | 2006 | 1971 |
| Body Type | Convertible | Sedan |
| Engine Position | Front | Front |
| Engine Size | 2492 cc | 1622 cc |
| Engine Cylinders | 6 cylinders | 4 cylinders |
| Engine Type | in-line | in-line |
| Horse Power | 189 HP | 67 HP |
| Engine RPM | 6000 RPM | 5000 RPM |
| Torque | 245 Nm | 121 Nm |
| Torque RPM | 3500 RPM | 2500 RPM |
| Engine Bore Size | 84 mm | 76.3 mm |
| Engine Stroke Size | 75 mm | 88.9 mm |
| Engine Compression Ratio | 11.0:1 | 8.3:1 |
| Fuel Type | Gasoline - Premium | Gasoline |
| Drive Type | Rear | Rear |
| Number of Seats | 2 seats | 5 seats |
| Number of Doors | 2 doors | 4 doors |
| Vehicle Weight | 1335 kg | 1148 kg |
| Vehicle Length | 4100 mm | 4540 mm |
| Vehicle Width | 1790 mm | 1620 mm |
| Vehicle Height | 1310 mm | 1510 mm |
| Wheelbase Size | 2500 mm | 2530 mm |
| Fuel Tank Capacity | 55 L | 45 L |
