1985 BMW M6 vs. 1977 BMW 520
To start off, 1985 BMW M6 is newer by 8 year(s). Which means there will be less support and parts availability for 1977 BMW 520. In addition, the cost of maintenance, including insurance, on 1977 BMW 520 would be higher. At 3,451 cc (6 cylinders), 1985 BMW M6 is equipped with a bigger engine. In terms of performance, 1985 BMW M6 (282 HP @ 6500 RPM) has 162 more horse power than 1977 BMW 520. (120 HP @ 6000 RPM). In normal driving conditions, 1985 BMW M6 should accelerate faster than 1977 BMW 520. With that said, vehicle weight also plays an important factor in acceleration. 1985 BMW M6 weights approximately 195 kg more than 1977 BMW 520. 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, 1985 BMW M6 (334 Nm @ 4500 RPM) has 174 more torque (in Nm) than 1977 BMW 520. (160 Nm @ 4000 RPM). This means 1985 BMW M6 will have an easier job in driving up hills or pulling heavy equipment than 1977 BMW 520.
Compare all specifications:
| 1985 BMW M6 | 1977 BMW 520 | |
| Make | BMW | BMW |
| Model | M6 | 520 |
| Year Released | 1985 | 1977 |
| Body Type | Coupe | Sedan |
| Engine Position | Front | Front |
| Engine Size | 3451 cc | 1990 cc |
| Engine Cylinders | 6 cylinders | 6 cylinders |
| Engine Type | in-line | in-line |
| Valves per Cylinder | 4 valves | 2 valves |
| Horse Power | 282 HP | 120 HP |
| Engine RPM | 6500 RPM | 6000 RPM |
| Torque | 334 Nm | 160 Nm |
| Torque RPM | 4500 RPM | 4000 RPM |
| Engine Bore Size | 93.4 mm | 80 mm |
| Engine Stroke Size | 84 mm | 66 mm |
| Engine Compression Ratio | 10.5:1 | 9.2:1 |
| Fuel Type | Gasoline | Gasoline |
| Drive Type | Rear | Rear |
| Transmission Type | Manual | Manual |
| Number of Seats | 4 seats | 5 seats |
| Number of Doors | 2 doors | 4 doors |
| Vehicle Weight | 1505 kg | 1310 kg |
| Vehicle Length | 4760 mm | 4630 mm |
| Vehicle Width | 1730 mm | 1700 mm |
| Vehicle Height | 1360 mm | 1430 mm |
| Wheelbase Size | 2630 mm | 2640 mm |
| Fuel Tank Capacity | 70 L | 70 L |
