1981 Alfa Romeo Spider vs. 2004 BMW 730
To start off, 2004 BMW 730 is newer by 23 year(s). Which means there will be less support and parts availability for 1981 Alfa Romeo Spider. In addition, the cost of maintenance, including insurance, on 1981 Alfa Romeo Spider would be higher. At 2,979 cc (6 cylinders), 2004 BMW 730 is equipped with a bigger engine. In terms of performance, 2004 BMW 730 (225 HP @ 6000 RPM) has 122 more horse power than 1981 Alfa Romeo Spider. (103 HP @ 5500 RPM) In normal driving conditions, 2004 BMW 730 should accelerate faster than 1981 Alfa Romeo Spider. With that said, vehicle weight also plays an important factor in acceleration. 2004 BMW 730 weights approximately 790 kg more than 1981 Alfa Romeo Spider. 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, 2004 BMW 730 (300 Nm @ 3500 RPM) has 155 more torque (in Nm) than 1981 Alfa Romeo Spider. (145 Nm @ 4500 RPM). This means 2004 BMW 730 will have an easier job in driving up hills or pulling heavy equipment than 1981 Alfa Romeo Spider.
Compare all specifications:
| 1981 Alfa Romeo Spider | 2004 BMW 730 | |
| Make | Alfa Romeo | BMW |
| Model | Spider | 730 |
| Year Released | 1981 | 2004 |
| Body Type | Roadster | Sedan |
| Engine Position | Front | Front |
| Engine Size | 1570 cc | 2979 cc |
| Engine Cylinders | 4 cylinders | 6 cylinders |
| Engine Type | in-line | in-line |
| Valves per Cylinder | 2 valves | 4 valves |
| Horse Power | 103 HP | 225 HP |
| Engine RPM | 5500 RPM | 6000 RPM |
| Torque | 145 Nm | 300 Nm |
| Torque RPM | 4500 RPM | 3500 RPM |
| Engine Bore Size | 78 mm | 84 mm |
| Engine Stroke Size | 82 mm | 90 mm |
| Engine Compression Ratio | 9.0:1 | 10.2:1 |
| Fuel Type | Gasoline | Gasoline |
| Drive Type | Rear | Rear |
| Number of Seats | 2 seats | 5 seats |
| Number of Doors | 2 doors | 4 doors |
| Vehicle Weight | 1000 kg | 1790 kg |
| Vehicle Length | 4130 mm | 5040 mm |
| Vehicle Width | 1640 mm | 1910 mm |
| Vehicle Height | 1300 mm | 1500 mm |
| Wheelbase Size | 2260 mm | 3000 mm |
