2005 Audi S4 vs. 1971 AC 428
To start off, 2005 Audi S4 is newer by 34 year(s). Which means there will be less support and parts availability for 1971 AC 428. In addition, the cost of maintenance, including insurance, on 1971 AC 428 would be higher. At 7,003 cc (8 cylinders), 1971 AC 428 is equipped with a bigger engine. In terms of performance, 2005 Audi S4 (340 HP @ 6300 RPM) has 42 more horse power than 1971 AC 428. (298 HP @ 4600 RPM). In normal driving conditions, 2005 Audi S4 should accelerate faster than 1971 AC 428. With that said, vehicle weight also plays an important factor in acceleration. 2005 Audi S4 weights approximately 410 kg more than 1971 AC 428. So despite on having greater horse power, its additional weight may have an impact towards its acceleration in comparison.
Let's talk about torque, 1971 AC 428 (639 Nm) has 229 more torque (in Nm) than 2005 Audi S4. (410 Nm). This means 1971 AC 428 will have an easier job in driving up hills or pulling heavy equipment than 2005 Audi S4.
Compare all specifications:
| 2005 Audi S4 | 1971 AC 428 | |
| Make | Audi | AC |
| Model | S4 | 428 |
| Year Released | 2005 | 1971 |
| Engine Position | Front | Front |
| Engine Size | 4161 cc | 7003 cc |
| Engine Cylinders | 8 cylinders | 8 cylinders |
| Engine Type | V | in-line |
| Horse Power | 340 HP | 298 HP |
| Engine RPM | 6300 RPM | 4600 RPM |
| Torque | 410 Nm | 639 Nm |
| Number of Seats | 4 seats | 2 seats |
| Number of Doors | 2 doors | 2 doors |
| Vehicle Weight | 1840 kg | 1430 kg |
| Vehicle Length | 4580 mm | 4430 mm |
| Vehicle Width | 1780 mm | 1710 mm |
| Vehicle Height | 1400 mm | 1310 mm |
| Wheelbase Size | 2660 mm | 2450 mm |
