Performance data and technical specs are based on the model from 1949.
Acceleration (0-100 km/h): 7.4 sec.
Topspeed (mph): 111
Acceleration (0-60 mph): 7.4 sec.
Cylinders: V8
Displacement: 5416 ccm (5.4 l)
Engine Power: 160 hp (119 kw)
Gears: Manual, 3-speed
Weight: 1067kg (2353 lbs)
Weight/Power ratio: 6.67 kg/hp
Power/Displacement ratio: 29.54 hp/l
Metric performance data, Allard J2 compared with similar cars:
| Allard J2 | Alfa Romeo Disco Volante Spider 1900 | Jaguar XK 120 | Muntz Jet | |
| Topspeed (km/h): | 179 | 225 | 201 | 174 |
| Acceleration (0-100 km/h): | 7.4 | 10.0 | 12.3 | |
| Power: | 160 hp (119 kw) | 158 hp (118 kw) | 160 hp (119 kw) | 152 hp (113 kw) |
| Weight (kg): | 1067 | 735 | 1295 | 1716 |
English performance data, Allard J2 compared with similar cars:
| Allard J2 | Alfa Romeo Disco Volante Spider 1900 | Jaguar XK 120 | Muntz Jet | |
| Topspeed (mph): | 111 | 140 | 125 | 108 |
| Acceleration (0-60 mph): | 7.4 | 10.0 | 12.3 | |
| Power: | 160 hp (119 kw) | 158 hp (118 kw) | 160 hp (119 kw) | 152 hp (113 kw) |
| Weight (lbs): | 2353 | 1621 | 2855 | 3784 |
