1951 Alvis TB 21 vs. 1951 Rover P4
To start off, both 1951 Alvis TB 21 and 1951 Rover P4 were released in the same year (1951). Therefore the support and the availability on parts for both vehicles should be relatively similar. 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 16 more horse power than 1951 Rover P4. (75 HP @ 4200 RPM). In normal driving conditions, 1951 Alvis TB 21 should accelerate faster than 1951 Rover P4.
Let's talk about torque, 1951 Alvis TB 21 (204 Nm) has 54 more torque (in Nm) than 1951 Rover P4. (150 Nm). This means 1951 Alvis TB 21 will have an easier job in driving up hills or pulling heavy equipment than 1951 Rover P4.
Compare all specifications:
| 1951 Alvis TB 21 | 1951 Rover P4 | |
| Make | Alvis | Rover |
| Model | TB 21 | P4 |
| Year Released | 1951 | 1951 |
| Engine Position | Front | Front |
| Engine Size | 2993 cc | 2103 cc |
| Engine Cylinders | 6 cylinders | 6 cylinders |
| Engine Type | in-line | in-line |
| Valves per Cylinder | 2 valves | 2 valves |
| Horse Power | 91 HP | 75 HP |
| Engine RPM | 4000 RPM | 4200 RPM |
| Torque | 204 Nm | 150 Nm |
| Engine Bore Size | 84 mm | 65.2 mm |
| Engine Stroke Size | 90 mm | 105 mm |
| Engine Compression Ratio | 7.1:1 | 7.3:1 |
| Fuel Type | Gasoline | Gasoline |
| Number of Seats | 5 seats | 5 seats |
| Vehicle Length | 4430 mm | 4590 mm |
| Vehicle Width | 1680 mm | 1670 mm |
| Wheelbase Size | 2750 mm | 2830 mm |
