2006 BMW 645 vs. 1981 Reliant Kitten
To start off, 2006 BMW 645 is newer by 25 year(s). Which means there will be less support and parts availability for 1981 Reliant Kitten. In addition, the cost of maintenance, including insurance, on 1981 Reliant Kitten would be higher. At 4,398 cc (8 cylinders), 2006 BMW 645 is equipped with a bigger engine. In terms of performance, 2006 BMW 645 (328 HP @ 6100 RPM) has 288 more horse power than 1981 Reliant Kitten. (40 HP @ 5500 RPM). In normal driving conditions, 2006 BMW 645 should accelerate faster than 1981 Reliant Kitten. With that said, vehicle weight also plays an important factor in acceleration. 2006 BMW 645 weights approximately 1270 kg more than 1981 Reliant Kitten. 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 645 (450 Nm @ 3600 RPM) has 387 more torque (in Nm) than 1981 Reliant Kitten. (63 Nm @ 3500 RPM). This means 2006 BMW 645 will have an easier job in driving up hills or pulling heavy equipment than 1981 Reliant Kitten.
Compare all specifications:
| 2006 BMW 645 | 1981 Reliant Kitten | |
| Make | BMW | Reliant |
| Model | 645 | Kitten |
| Year Released | 2006 | 1981 |
| Engine Position | Front | Front |
| Engine Size | 4398 cc | 848 cc |
| Engine Cylinders | 8 cylinders | 4 cylinders |
| Engine Type | V | in-line |
| Horse Power | 328 HP | 40 HP |
| Engine RPM | 6100 RPM | 5500 RPM |
| Torque | 450 Nm | 63 Nm |
| Torque RPM | 3600 RPM | 3500 RPM |
| Engine Bore Size | 92 mm | 62.5 mm |
| Engine Stroke Size | 83 mm | 69.1 mm |
| Fuel Type | Gasoline | Gasoline |
| Drive Type | Rear | Rear |
| Transmission Type | Manual | Manual |
| Number of Seats | 4 seats | 4 seats |
| Vehicle Weight | 1810 kg | 540 kg |
| Vehicle Length | 4830 mm | 3330 mm |
| Vehicle Width | 1860 mm | 1430 mm |
| Vehicle Height | 1380 mm | 1400 mm |
| Wheelbase Size | 2790 mm | 2150 mm |
| Fuel Tank Capacity | 70 L | 27 L |
