1991 BMW Z1 vs. 1976 BMW 633
To start off, 1991 BMW Z1 is newer by 15 year(s). Which means there will be less support and parts availability for 1976 BMW 633. In addition, the cost of maintenance, including insurance, on 1976 BMW 633 would be higher. At 3,210 cc (6 cylinders), 1976 BMW 633 is equipped with a bigger engine. In terms of performance, 1976 BMW 633 (197 HP @ 5500 RPM) has 22 more horse power than 1991 BMW Z1. (175 HP @ 5800 RPM) In normal driving conditions, 1976 BMW 633 should accelerate faster than 1991 BMW Z1. With that said, vehicle weight also plays an important factor in acceleration. 1976 BMW 633 weights approximately 220 kg more than 1991 BMW Z1. 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, 1976 BMW 633 (285 Nm @ 4250 RPM) has 55 more torque (in Nm) than 1991 BMW Z1. (230 Nm @ 4000 RPM). This means 1976 BMW 633 will have an easier job in driving up hills or pulling heavy equipment than 1991 BMW Z1.
Compare all specifications:
| 1991 BMW Z1 | 1976 BMW 633 | |
| Make | BMW | BMW |
| Model | Z1 | 633 |
| Year Released | 1991 | 1976 |
| Body Type | Roadster | Coupe |
| Engine Position | Front | Front |
| Engine Size | 2497 cc | 3210 cc |
| Engine Cylinders | 6 cylinders | 6 cylinders |
| Engine Type | in-line | in-line |
| Valves per Cylinder | 2 valves | 2 valves |
| Horse Power | 175 HP | 197 HP |
| Engine RPM | 5800 RPM | 5500 RPM |
| Torque | 230 Nm | 285 Nm |
| Torque RPM | 4000 RPM | 4250 RPM |
| Engine Compression Ratio | 11.0:1 | 9.0:1 |
| Drive Type | Rear | Rear |
| Transmission Type | Manual | Manual |
| Number of Seats | 2 seats | 4 seats |
| Vehicle Weight | 1250 kg | 1470 kg |
| Vehicle Length | 3960 mm | 4760 mm |
| Vehicle Width | 1810 mm | 1760 mm |
| Vehicle Height | 1280 mm | 1390 mm |
| Wheelbase Size | 2450 mm | 2630 mm |
