1951 Alvis TB 21 vs. 1978 Mercury Grand Marquis
To start off, 1978 Mercury Grand Marquis is newer by 27 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), 1978 Mercury Grand Marquis is equipped with a bigger engine. In terms of performance, 1978 Mercury Grand Marquis (129 HP @ 3600 RPM) has 38 more horse power than 1951 Alvis TB 21. (91 HP @ 4000 RPM) In normal driving conditions, 1978 Mercury Grand Marquis should accelerate faster than 1951 Alvis TB 21.
Let's talk about torque, 1978 Mercury Grand Marquis (303 Nm) has 99 more torque (in Nm) than 1951 Alvis TB 21. (204 Nm). This means 1978 Mercury Grand Marquis 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 | 1978 Mercury Grand Marquis | |
| Make | Alvis | Mercury |
| Model | TB 21 | Grand Marquis |
| Year Released | 1951 | 1978 |
| Engine Position | Front | Front |
| Engine Size | 2993 cc | 4942 cc |
| Engine Cylinders | 6 cylinders | 8 cylinders |
| Engine Type | in-line | V |
| Horse Power | 91 HP | 129 HP |
| Engine RPM | 4000 RPM | 3600 RPM |
| Torque | 204 Nm | 303 Nm |
| Engine Bore Size | 84 mm | 101.6 mm |
| Engine Stroke Size | 90 mm | 76.2 mm |
| Fuel Type | Gasoline | Gasoline |
| Number of Seats | 5 seats | 5 seats |
| Vehicle Length | 4430 mm | 5400 mm |
| Vehicle Width | 1680 mm | 1980 mm |
| Wheelbase Size | 2750 mm | 2910 mm |
