1958 AC Ace vs. 1972 BMW 520
To start off, 1972 BMW 520 is newer by 14 year(s). Which means there will be less support and parts availability for 1958 AC Ace. In addition, the cost of maintenance, including insurance, on 1958 AC Ace would be higher. At 1,991 cc (6 cylinders), 1972 BMW 520 is equipped with a bigger engine. In terms of performance, 1972 BMW 520 (150 HP @ 5900 RPM) has 25 more horse power than 1958 AC Ace. (125 HP @ 6000 RPM) In normal driving conditions, 1972 BMW 520 should accelerate faster than 1958 AC Ace. With that said, vehicle weight also plays an important factor in acceleration. 1972 BMW 520 weights approximately 551 kg more than 1958 AC Ace. So despite on having greater horse power, its additional weight may have an impact towards its acceleration in comparison.
Let's talk about torque, 1972 BMW 520 (190 Nm @ 4200 RPM) has 23 more torque (in Nm) than 1958 AC Ace. (167 Nm @ 4500 RPM). This means 1972 BMW 520 will have an easier job in driving up hills or pulling heavy equipment than 1958 AC Ace.
Compare all specifications:
| 1958 AC Ace | 1972 BMW 520 | |
| Make | AC | BMW |
| Model | Ace | 520 |
| Year Released | 1958 | 1972 |
| Body Type | Roadster | Sedan |
| Engine Position | Front | Front |
| Engine Size | 1971 cc | 1991 cc |
| Engine Cylinders | 6 cylinders | 6 cylinders |
| Engine Type | in-line | in-line |
| Valves per Cylinder | 2 valves | 4 valves |
| Horse Power | 125 HP | 150 HP |
| Engine RPM | 6000 RPM | 5900 RPM |
| Torque | 167 Nm | 190 Nm |
| Torque RPM | 4500 RPM | 4200 RPM |
| Engine Bore Size | 66 mm | 80 mm |
| Engine Stroke Size | 96 mm | 66 mm |
| Engine Compression Ratio | 9.0:1 | 11.0:1 |
| Number of Seats | 2 seats | 5 seats |
| Number of Doors | 2 doors | 4 doors |
| Vehicle Weight | 894 kg | 1445 kg |
| Vehicle Length | 4010 mm | 4630 mm |
| Vehicle Width | 1520 mm | 1700 mm |
| Vehicle Height | 1270 mm | 1430 mm |
| Wheelbase Size | 2290 mm | 2770 mm |
| Fuel Tank Capacity | 59 L | 80 L |
