1974 BMW Touring vs. 2004 BMW 645
To start off, 2004 BMW 645 is newer by 30 year(s). Which means there will be less support and parts availability for 1974 BMW Touring. In addition, the cost of maintenance, including insurance, on 1974 BMW Touring would be higher. At 4,398 cc (8 cylinders), 2004 BMW 645 is equipped with a bigger engine. In terms of performance, 2004 BMW 645 (328 HP @ 6100 RPM) has 243 more horse power than 1974 BMW Touring. (85 HP @ 5700 RPM) In normal driving conditions, 2004 BMW 645 should accelerate faster than 1974 BMW Touring. With that said, vehicle weight also plays an important factor in acceleration. 2004 BMW 645 weights approximately 660 kg more than 1974 BMW Touring. So despite on having greater horse power, its additional weight may have an impact towards its acceleration in comparison.
Let's talk about torque, 2004 BMW 645 (450 Nm @ 3600 RPM) has 320 more torque (in Nm) than 1974 BMW Touring. (130 Nm @ 3500 RPM). This means 2004 BMW 645 will have an easier job in driving up hills or pulling heavy equipment than 1974 BMW Touring.
Compare all specifications:
| 1974 BMW Touring | 2004 BMW 645 | |
| Make | BMW | BMW |
| Model | Touring | 645 |
| Year Released | 1974 | 2004 |
| Engine Position | Front | Front |
| Engine Size | 1572 cc | 4398 cc |
| Engine Cylinders | 4 cylinders | 8 cylinders |
| Engine Type | in-line | V |
| Valves per Cylinder | 2 valves | 4 valves |
| Horse Power | 85 HP | 328 HP |
| Engine RPM | 5700 RPM | 6100 RPM |
| Torque | 130 Nm | 450 Nm |
| Torque RPM | 3500 RPM | 3600 RPM |
| Engine Bore Size | 84 mm | 92 mm |
| Engine Stroke Size | 71 mm | 82.7 mm |
| Engine Compression Ratio | 8.6:1 | 10.0:1 |
| Fuel Type | Gasoline | Gasoline - Premium |
| Number of Seats | 5 seats | 4 seats |
| Vehicle Weight | 1030 kg | 1690 kg |
| Vehicle Length | 4120 mm | 4830 mm |
| Vehicle Width | 1600 mm | 1860 mm |
| Vehicle Height | 1390 mm | 1380 mm |
| Wheelbase Size | 2510 mm | 2830 mm |
