1951 Alvis TB 21 vs. 2008 BMW X5
To start off, 2008 BMW X5 is newer by 57 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 4,797 cc (8 cylinders), 2008 BMW X5 is equipped with a bigger engine. In terms of performance, 2008 BMW X5 (355 HP @ 6200 RPM) has 264 more horse power than 1951 Alvis TB 21. (91 HP @ 4000 RPM) In normal driving conditions, 2008 BMW X5 should accelerate faster than 1951 Alvis TB 21.
Let's talk about torque, 2008 BMW X5 (490 Nm) has 286 more torque (in Nm) than 1951 Alvis TB 21. (204 Nm). This means 2008 BMW X5 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 | 2008 BMW X5 | |
| Make | Alvis | BMW |
| Model | TB 21 | X5 |
| Year Released | 1951 | 2008 |
| Engine Position | Front | Front |
| Engine Size | 2993 cc | 4797 cc |
| Engine Cylinders | 6 cylinders | 8 cylinders |
| Engine Type | in-line | V |
| Valves per Cylinder | 2 valves | 4 valves |
| Horse Power | 91 HP | 355 HP |
| Engine RPM | 4000 RPM | 6200 RPM |
| Torque | 204 Nm | 490 Nm |
| Engine Bore Size | 84 mm | 93 mm |
| Engine Stroke Size | 90 mm | 88.3 mm |
| Engine Compression Ratio | 7.1:1 | 11.0:1 |
| Fuel Type | Gasoline | Gasoline - Premium |
| Number of Seats | 5 seats | 5 seats |
| Vehicle Length | 4430 mm | 4670 mm |
| Vehicle Width | 1680 mm | 1880 mm |
| Wheelbase Size | 2750 mm | 2830 mm |
