1951 Alvis TB 21 vs. 1964 Porsche 911
To start off, 1964 Porsche 911 is newer by 13 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, 1964 Porsche 911 (129 HP @ 6100 RPM) has 38 more horse power than 1951 Alvis TB 21. (91 HP @ 4000 RPM) In normal driving conditions, 1964 Porsche 911 should accelerate faster than 1951 Alvis TB 21.
Let's talk about torque, 1951 Alvis TB 21 (204 Nm) has 26 more torque (in Nm) than 1964 Porsche 911. (178 Nm). This means 1951 Alvis TB 21 will have an easier job in driving up hills or pulling heavy equipment than 1964 Porsche 911.
Compare all specifications:
| 1951 Alvis TB 21 | 1964 Porsche 911 | |
| Make | Alvis | Porsche |
| Model | TB 21 | 911 |
| Year Released | 1951 | 1964 |
| Engine Position | Front | Rear |
| Engine Size | 2993 cc | 1991 cc |
| Engine Cylinders | 6 cylinders | 6 cylinders |
| Engine Type | in-line | in-line |
| Valves per Cylinder | 2 valves | 2 valves |
| Horse Power | 91 HP | 129 HP |
| Engine RPM | 4000 RPM | 6100 RPM |
| Torque | 204 Nm | 178 Nm |
| Engine Bore Size | 84 mm | 80.1 mm |
| Engine Stroke Size | 90 mm | 66 mm |
| Engine Compression Ratio | 7.1:1 | 9.0:1 |
| Fuel Type | Gasoline | Gasoline |
| Number of Seats | 5 seats | 4 seats |
| Vehicle Length | 4430 mm | 4170 mm |
| Vehicle Width | 1680 mm | 1620 mm |
| Wheelbase Size | 2750 mm | 2190 mm |
