1951 Alvis TB 21 vs. 2008 Fiat Siena
To start off, 2008 Fiat Siena is newer by 57 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, 2008 Fiat Siena (106 HP @ 5500 RPM) has 15 more horse power than 1951 Alvis TB 21. (91 HP @ 4000 RPM) In normal driving conditions, 2008 Fiat Siena should accelerate faster than 1951 Alvis TB 21.
Let's talk about torque, 1951 Alvis TB 21 (204 Nm) has 64 more torque (in Nm) than 2008 Fiat Siena. (140 Nm). This means 1951 Alvis TB 21 will have an easier job in driving up hills or pulling heavy equipment than 2008 Fiat Siena.
Compare all specifications:
| 1951 Alvis TB 21 | 2008 Fiat Siena | |
| Make | Alvis | Fiat |
| Model | TB 21 | Siena |
| Year Released | 1951 | 2008 |
| Engine Position | Front | Front |
| Engine Size | 2993 cc | 1581 cc |
| Engine Cylinders | 6 cylinders | 4 cylinders |
| Engine Type | in-line | in-line |
| Valves per Cylinder | 2 valves | 4 valves |
| Horse Power | 91 HP | 106 HP |
| Engine RPM | 4000 RPM | 5500 RPM |
| Torque | 204 Nm | 140 Nm |
| Engine Bore Size | 84 mm | 86.5 mm |
| Engine Stroke Size | 90 mm | 67.4 mm |
| Engine Compression Ratio | 7.1:1 | 10.2:1 |
| Fuel Type | Gasoline | Gasoline |
| Number of Seats | 5 seats | 5 seats |
| Vehicle Length | 4430 mm | 3550 mm |
| Vehicle Width | 1680 mm | 1640 mm |
| Wheelbase Size | 2750 mm | 2370 mm |
