1951 Alvis TB 21 vs. 1958 Aston Martin DB4
To start off, 1958 Aston Martin DB4 is newer by 7 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 3,668 cc (6 cylinders), 1958 Aston Martin DB4 is equipped with a bigger engine. In terms of performance, 1958 Aston Martin DB4 (240 HP @ 5500 RPM) has 149 more horse power than 1951 Alvis TB 21. (91 HP @ 4000 RPM) In normal driving conditions, 1958 Aston Martin DB4 should accelerate faster than 1951 Alvis TB 21.
Let's talk about torque, 1958 Aston Martin DB4 (325 Nm) has 121 more torque (in Nm) than 1951 Alvis TB 21. (204 Nm). This means 1958 Aston Martin DB4 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 | 1958 Aston Martin DB4 | |
| Make | Alvis | Aston Martin |
| Model | TB 21 | DB4 |
| Year Released | 1951 | 1958 |
| Engine Position | Front | Front |
| Engine Size | 2993 cc | 3668 cc |
| Engine Cylinders | 6 cylinders | 6 cylinders |
| Engine Type | in-line | in-line |
| Valves per Cylinder | 2 valves | 2 valves |
| Horse Power | 91 HP | 240 HP |
| Engine RPM | 4000 RPM | 5500 RPM |
| Torque | 204 Nm | 325 Nm |
| Engine Bore Size | 84 mm | 92 mm |
| Engine Stroke Size | 90 mm | 92 mm |
| Engine Compression Ratio | 7.1:1 | 8.3:1 |
| Number of Seats | 5 seats | 4 seats |
| Vehicle Length | 4430 mm | 4490 mm |
| Vehicle Width | 1680 mm | 1680 mm |
| Wheelbase Size | 2750 mm | 2500 mm |
