1975 AC 428 vs. 2006 BMW 645
To start off, 2006 BMW 645 is newer by 31 year(s). Which means there will be less support and parts availability for 1975 AC 428. In addition, the cost of maintenance, including insurance, on 1975 AC 428 would be higher. At 7,003 cc (8 cylinders), 1975 AC 428 is equipped with a bigger engine. In terms of performance, 2006 BMW 645 (328 HP @ 6100 RPM) has 30 more horse power than 1975 AC 428. (298 HP @ 4600 RPM) In normal driving conditions, 2006 BMW 645 should accelerate faster than 1975 AC 428. With that said, vehicle weight also plays an important factor in acceleration. 2006 BMW 645 weights approximately 380 kg more than 1975 AC 428. 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, 1975 AC 428 (639 Nm @ 2800 RPM) has 189 more torque (in Nm) than 2006 BMW 645. (450 Nm @ 3600 RPM). This means 1975 AC 428 will have an easier job in driving up hills or pulling heavy equipment than 2006 BMW 645.
Compare all specifications:
| 1975 AC 428 | 2006 BMW 645 | |
| Make | AC | BMW |
| Model | 428 | 645 |
| Year Released | 1975 | 2006 |
| Engine Position | Front | Front |
| Engine Size | 7003 cc | 4398 cc |
| Engine Cylinders | 8 cylinders | 8 cylinders |
| Engine Type | in-line | V |
| Horse Power | 298 HP | 328 HP |
| Engine RPM | 4600 RPM | 6100 RPM |
| Torque | 639 Nm | 450 Nm |
| Torque RPM | 2800 RPM | 3600 RPM |
| Fuel Type | Gasoline | Gasoline |
| Drive Type | Rear | Rear |
| Transmission Type | Manual | Manual |
| Number of Seats | 2 seats | 4 seats |
| Number of Doors | 2 doors | 2 doors |
| Vehicle Weight | 1430 kg | 1810 kg |
| Vehicle Length | 4430 mm | 4830 mm |
| Vehicle Width | 1710 mm | 1860 mm |
| Vehicle Height | 1310 mm | 1380 mm |
| Wheelbase Size | 2450 mm | 2790 mm |
