1951 Alvis TB 21 vs. 2009 BMW X5
To start off, 2009 BMW X5 is newer by 58 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 4,799 cc (8 cylinders), 2009 BMW X5 is equipped with a bigger engine. In terms of performance, 2009 BMW X5 (350 HP @ 6300 RPM) has 259 more horse power than 1951 Alvis TB 21. (91 HP @ 4000 RPM) In normal driving conditions, 2009 BMW X5 should accelerate faster than 1951 Alvis TB 21.
Let's talk about torque, 2009 BMW X5 (476 Nm) has 272 more torque (in Nm) than 1951 Alvis TB 21. (204 Nm). This means 2009 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 | 2009 BMW X5 | |
| Make | Alvis | BMW |
| Model | TB 21 | X5 |
| Year Released | 1951 | 2009 |
| Engine Position | Front | Front |
| Engine Size | 2993 cc | 4799 cc |
| Engine Cylinders | 6 cylinders | 8 cylinders |
| Engine Type | in-line | V |
| Valves per Cylinder | 2 valves | 4 valves |
| Horse Power | 91 HP | 350 HP |
| Engine RPM | 4000 RPM | 6300 RPM |
| Torque | 204 Nm | 476 Nm |
| Engine Bore Size | 84 mm | 93 mm |
| Engine Stroke Size | 90 mm | 88.3 mm |
| Fuel Type | Gasoline | Gasoline - Premium |
| Vehicle Length | 4430 mm | 4860 mm |
| Vehicle Width | 1680 mm | 1940 mm |
| Wheelbase Size | 2750 mm | 2940 mm |
