1951 Alvis TB 21 vs. 1980 Pontiac Firebird
To start off, 1980 Pontiac Firebird is newer by 29 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 4,942 cc (8 cylinders), 1980 Pontiac Firebird is equipped with a bigger engine. In terms of performance, 1980 Pontiac Firebird (200 HP @ 4000 RPM) has 109 more horse power than 1951 Alvis TB 21. (91 HP @ 4000 RPM) In normal driving conditions, 1980 Pontiac Firebird should accelerate faster than 1951 Alvis TB 21.
Let's talk about torque, 1980 Pontiac Firebird (459 Nm) has 255 more torque (in Nm) than 1951 Alvis TB 21. (204 Nm). This means 1980 Pontiac Firebird 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 | 1980 Pontiac Firebird | |
| Make | Alvis | Pontiac |
| Model | TB 21 | Firebird |
| Year Released | 1951 | 1980 |
| Engine Position | Front | Front |
| Engine Size | 2993 cc | 4942 cc |
| Engine Cylinders | 6 cylinders | 8 cylinders |
| Engine Type | in-line | V |
| Valves per Cylinder | 2 valves | 2 valves |
| Horse Power | 91 HP | 200 HP |
| Engine RPM | 4000 RPM | 4000 RPM |
| Torque | 204 Nm | 459 Nm |
| Engine Bore Size | 84 mm | 101.6 mm |
| Engine Stroke Size | 90 mm | 76.2 mm |
| Engine Compression Ratio | 7.1:1 | 7.5:1 |
| Fuel Type | Gasoline | Gasoline |
| Number of Seats | 5 seats | 4 seats |
| Vehicle Length | 4430 mm | 4880 mm |
| Vehicle Width | 1680 mm | 1870 mm |
| Wheelbase Size | 2750 mm | 2750 mm |
