| Technical Information / Specifications |
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1951 Allard J1 3.9
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| Engine Position: | Front |
| Engine: | 3917 ccm (237,82 cubic inches) |
| Engine type: | in-line, 8-cyl |
| Valves per cylinder: | 2 |
| Max. Power: | 101.00 PS (73,63 kW or 99,50 HP) at 3800 Rev. per min. |
| Max. Torque: | 305.00 Nm (30,94 kgf-m or 223,88 ft.lbs) at 2500 Rev. per min. |
| Bore / Stroke: | 81.0 x 95.3 mm (3,18 x 3.8 inches) |
| Fuel: | Gasoline |
| Transmission: | Manual, 3-speed |
| Power / Weight ratio: | 0.0886 PS/kg |
| Drive: | Rear |
| Seats: | 2 |
| Passenger space: | 3590 litres (943,26 gallons) |
| Doors: | 2 |
| Country of origin: | UK |
| Weight: | 1146 kg (2513,87 pounds) |
| Total length: | 3690 mm (144,57 inches) |
| Total width: | 1480 mm (58,01 inches) |
| Total height: | 1510 mm (59,10 inches) |
| Wheelbase: | 2440 mm (95,62 inches) |
| Fuel tank capacity: | 113.0 litres (29,70 gallons) |