1951 Alvis TB 21 vs. 1955 BMW 501
To start off, 1955 BMW 501 is newer by 4 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, 1955 BMW 501 (110 HP @ 4800 RPM) has 19 more horse power than 1951 Alvis TB 21. (91 HP @ 4000 RPM) In normal driving conditions, 1955 BMW 501 should accelerate faster than 1951 Alvis TB 21.
Compare all specifications:
| 1951 Alvis TB 21 | 1955 BMW 501 | |
| Make | Alvis | BMW |
| Model | TB 21 | 501 |
| Year Released | 1951 | 1955 |
| Engine Position | Front | Front |
| Engine Size | 2993 cc | 2580 cc |
| Engine Cylinders | 6 cylinders | 8 cylinders |
| Engine Type | in-line | in-line |
| Valves per Cylinder | 2 valves | 2 valves |
| Horse Power | 91 HP | 110 HP |
| Engine RPM | 4000 RPM | 4800 RPM |
| Engine Bore Size | 84 mm | 74.1 mm |
| Engine Stroke Size | 90 mm | 75 mm |
| Engine Compression Ratio | 7.1:1 | 7.0:1 |
| Fuel Type | Gasoline | Gasoline |
| Number of Seats | 5 seats | 5 seats |
| Vehicle Length | 4430 mm | 4710 mm |
| Vehicle Width | 1680 mm | 1780 mm |
| Wheelbase Size | 2750 mm | 2840 mm |
