1951 Alvis TB 21 vs. 2004 BMW Z4
To start off, 2004 BMW Z4 is newer by 53 year(s). Which means there will be less support and parts availability for 1951 Alvis TB 21. In addition, the cost of maintenance, including insurance, on 1951 Alvis TB 21 would be higher. At 2,993 cc (6 cylinders), 1951 Alvis TB 21 is equipped with a bigger engine. In terms of performance, 2004 BMW Z4 (225 HP @ 5900 RPM) has 134 more horse power than 1951 Alvis TB 21. (91 HP @ 4000 RPM) In normal driving conditions, 2004 BMW Z4 should accelerate faster than 1951 Alvis TB 21.
Let's talk about torque, 2004 BMW Z4 (300 Nm) has 96 more torque (in Nm) than 1951 Alvis TB 21. (204 Nm). This means 2004 BMW Z4 will have an easier job in driving up hills or pulling heavy equipment than 1951 Alvis TB 21.
Compare all specifications:
| 1951 Alvis TB 21 | 2004 BMW Z4 | |
| Make | Alvis | BMW |
| Model | TB 21 | Z4 |
| Year Released | 1951 | 2004 |
| Engine Position | Front | Front |
| Engine Size | 2993 cc | 2983 cc |
| Engine Cylinders | 6 cylinders | 6 cylinders |
| Engine Type | in-line | in-line |
| Valves per Cylinder | 2 valves | 4 valves |
| Horse Power | 91 HP | 225 HP |
| Engine RPM | 4000 RPM | 5900 RPM |
| Torque | 204 Nm | 300 Nm |
| Engine Compression Ratio | 7.1:1 | 10.2:1 |
| Fuel Type | Gasoline | Gasoline - Premium |
| Number of Seats | 5 seats | 2 seats |
| Vehicle Length | 4430 mm | 4100 mm |
| Vehicle Width | 1680 mm | 1790 mm |
| Wheelbase Size | 2750 mm | 2500 mm |
