1951 Alvis TB 21 vs. 1969 Porsche 911
To start off, 1969 Porsche 911 is newer by 18 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, 1969 Porsche 911 (156 HP) has 65 more horse power than 1951 Alvis TB 21. (91 HP) In normal driving conditions, 1969 Porsche 911 should accelerate faster than 1951 Alvis TB 21.
Let's talk about torque, 1951 Alvis TB 21 (204 Nm) has 13 more torque (in Nm) than 1969 Porsche 911. (191 Nm). This means 1951 Alvis TB 21 will have an easier job in driving up hills or pulling heavy equipment than 1969 Porsche 911.
Compare all specifications:
| 1951 Alvis TB 21 | 1969 Porsche 911 | |
| Make | Alvis | Porsche |
| Model | TB 21 | 911 |
| Year Released | 1951 | 1969 |
| Engine Position | Front | Rear |
| Engine Size | 2993 cc | 2195 cc |
| Engine Cylinders | 6 cylinders | 6 cylinders |
| Engine Type | in-line | boxer |
| Valves per Cylinder | 2 valves | 2 valves |
| Horse Power | 91 HP | 156 HP |
| Torque | 204 Nm | 191 Nm |
| Engine Bore Size | 84 mm | 84 mm |
| Engine Stroke Size | 90 mm | 66 mm |
| Engine Compression Ratio | 7.1:1 | 9.0:1 |
| Number of Seats | 5 seats | 4 seats |
| Vehicle Length | 4430 mm | 4170 mm |
| Vehicle Width | 1680 mm | 1620 mm |
| Wheelbase Size | 2750 mm | 2270 mm |
