1973 BMW 1502 vs. 1981 BMW 528
To start off, 1981 BMW 528 is newer by 8 year(s). Which means there will be less support and parts availability for 1973 BMW 1502. In addition, the cost of maintenance, including insurance, on 1973 BMW 1502 would be higher. At 2,788 cc (6 cylinders), 1981 BMW 528 is equipped with a bigger engine. In terms of performance, 1981 BMW 528 (181 HP @ 5800 RPM) has 96 more horse power than 1973 BMW 1502. (85 HP @ 5800 RPM) In normal driving conditions, 1981 BMW 528 should accelerate faster than 1973 BMW 1502. With that said, vehicle weight also plays an important factor in acceleration. 1981 BMW 528 weights approximately 370 kg more than 1973 BMW 1502. So despite on having greater horse power, its additional weight may have an impact towards its acceleration in comparison.
Let's talk about torque, 1981 BMW 528 (240 Nm @ 4200 RPM) has 110 more torque (in Nm) than 1973 BMW 1502. (130 Nm @ 3500 RPM). This means 1981 BMW 528 will have an easier job in driving up hills or pulling heavy equipment than 1973 BMW 1502.
Compare all specifications:
| 1973 BMW 1502 | 1981 BMW 528 | |
| Make | BMW | BMW |
| Model | 1502 | 528 |
| Year Released | 1973 | 1981 |
| Engine Position | Front | Front |
| Engine Size | 1573 cc | 2788 cc |
| Engine Cylinders | 4 cylinders | 6 cylinders |
| Engine Type | in-line | in-line |
| Valves per Cylinder | 2 valves | 2 valves |
| Horse Power | 85 HP | 181 HP |
| Engine RPM | 5800 RPM | 5800 RPM |
| Torque | 130 Nm | 240 Nm |
| Torque RPM | 3500 RPM | 4200 RPM |
| Engine Bore Size | 84 mm | 86 mm |
| Engine Stroke Size | 71 mm | 80 mm |
| Engine Compression Ratio | 8.6:1 | 9.3:1 |
| Number of Seats | 5 seats | 5 seats |
| Number of Doors | 2 doors | 4 doors |
| Vehicle Weight | 930 kg | 1300 kg |
| Vehicle Length | 4240 mm | 4630 mm |
| Vehicle Width | 1600 mm | 1710 mm |
| Vehicle Height | 1420 mm | 1430 mm |
| Wheelbase Size | 2510 mm | 2630 mm |
| Fuel Tank Capacity | 50 L | 70 L |
