1973 BMW 2004 vs. 2006 BMW 645
To start off, 2006 BMW 645 is newer by 33 year(s). Which means there will be less support and parts availability for 1973 BMW 2004. In addition, the cost of maintenance, including insurance, on 1973 BMW 2004 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 231 more horse power than 1973 BMW 2004. (97 HP @ 5800 RPM) In normal driving conditions, 2006 BMW 645 should accelerate faster than 1973 BMW 2004. With that said, vehicle weight also plays an important factor in acceleration. 2006 BMW 645 weights approximately 672 kg more than 1973 BMW 2004. 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 293 more torque (in Nm) than 1973 BMW 2004. (157 Nm @ 3000 RPM). This means 2006 BMW 645 will have an easier job in driving up hills or pulling heavy equipment than 1973 BMW 2004.
Compare all specifications:
| 1973 BMW 2004 | 2006 BMW 645 | |
| Make | BMW | BMW |
| Model | 2004 | 645 |
| Year Released | 1973 | 2006 |
| Engine Position | Front | Front |
| Engine Size | 1991 cc | 4398 cc |
| Engine Cylinders | 4 cylinders | 8 cylinders |
| Engine Type | in-line | V |
| Horse Power | 97 HP | 328 HP |
| Engine RPM | 5800 RPM | 6100 RPM |
| Torque | 157 Nm | 450 Nm |
| Torque RPM | 3000 RPM | 3600 RPM |
| Engine Bore Size | 89 mm | 92 mm |
| Engine Stroke Size | 80 mm | 82.7 mm |
| Engine Compression Ratio | 8.5:1 | 10.0:1 |
| Drive Type | Rear | Rear |
| Number of Seats | 5 seats | 4 seats |
| Vehicle Weight | 1020 kg | 1692 kg |
| Vehicle Length | 4420 mm | 4830 mm |
| Vehicle Width | 1620 mm | 1860 mm |
| Vehicle Height | 1400 mm | 1380 mm |
| Wheelbase Size | 2510 mm | 2790 mm |
