1979 BMW 633 vs. 2003 BMW 645
To start off, 2003 BMW 645 is newer by 24 year(s). Which means there will be less support and parts availability for 1979 BMW 633. In addition, the cost of maintenance, including insurance, on 1979 BMW 633 would be higher. At 4,398 cc (8 cylinders), 2003 BMW 645 is equipped with a bigger engine. In terms of performance, 2003 BMW 645 (325 HP @ 6100 RPM) has 131 more horse power than 1979 BMW 633. (194 HP @ 5500 RPM) In normal driving conditions, 2003 BMW 645 should accelerate faster than 1979 BMW 633. With that said, vehicle weight also plays an important factor in acceleration. 2003 BMW 645 weights approximately 220 kg more than 1979 BMW 633. 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, 2003 BMW 645 (450 Nm @ 3600 RPM) has 165 more torque (in Nm) than 1979 BMW 633. (285 Nm @ 4300 RPM). This means 2003 BMW 645 will have an easier job in driving up hills or pulling heavy equipment than 1979 BMW 633.
Compare all specifications:
| 1979 BMW 633 | 2003 BMW 645 | |
| Make | BMW | BMW |
| Model | 633 | 645 |
| Year Released | 1979 | 2003 |
| Body Type | Coupe | Coupe |
| Engine Position | Front | Front |
| Engine Size | 3210 cc | 4398 cc |
| Engine Cylinders | 6 cylinders | 8 cylinders |
| Engine Type | in-line | V |
| Valves per Cylinder | 2 valves | 4 valves |
| Horse Power | 194 HP | 325 HP |
| Engine RPM | 5500 RPM | 6100 RPM |
| Torque | 285 Nm | 450 Nm |
| Torque RPM | 4300 RPM | 3600 RPM |
| Engine Bore Size | 89 mm | 92 mm |
| Engine Stroke Size | 86 mm | 82.7 mm |
| Engine Compression Ratio | 9.3:1 | 10.5:1 |
| Drive Type | Rear | Rear |
| Transmission Type | Manual | Manual |
| Number of Seats | 4 seats | 4 seats |
| Number of Doors | 2 doors | 2 doors |
| Vehicle Weight | 1470 kg | 1690 kg |
| Vehicle Length | 4760 mm | 4830 mm |
| Vehicle Width | 1760 mm | 1860 mm |
| Vehicle Height | 1390 mm | 1380 mm |
| Wheelbase Size | 2640 mm | 2890 mm |
| Fuel Tank Capacity | 70 L | 70 L |
