1951 Alvis TB 21 vs. 1956 Rover P4
To start off, 1956 Rover P4 is newer by 5 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, 1951 Alvis TB 21 (91 HP @ 4000 RPM) has 40 more horse power than 1956 Rover P4. (51 HP @ 4000 RPM). In normal driving conditions, 1951 Alvis TB 21 should accelerate faster than 1956 Rover P4.
Let's talk about torque, 1951 Alvis TB 21 (204 Nm) has 66 more torque (in Nm) than 1956 Rover P4. (138 Nm). This means 1951 Alvis TB 21 will have an easier job in driving up hills or pulling heavy equipment than 1956 Rover P4.
Compare all specifications:
| 1951 Alvis TB 21 | 1956 Rover P4 | |
| Make | Alvis | Rover |
| Model | TB 21 | P4 |
| Year Released | 1951 | 1956 |
| Engine Position | Front | Front |
| Engine Size | 2993 cc | 1997 cc |
| Engine Cylinders | 6 cylinders | 4 cylinders |
| Engine Type | in-line | in-line |
| Valves per Cylinder | 2 valves | 2 valves |
| Horse Power | 91 HP | 51 HP |
| Engine RPM | 4000 RPM | 4000 RPM |
| Torque | 204 Nm | 138 Nm |
| Fuel Type | Gasoline | Gasoline |
| Number of Seats | 5 seats | 5 seats |
| Vehicle Length | 4430 mm | 4550 mm |
| Vehicle Width | 1680 mm | 1680 mm |
| Wheelbase Size | 2750 mm | 2830 mm |
