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Lotus 81B
| Tuner | |
| Country | GB |
| Year | 1981 |
| Engine | Ford Cosworth DFV |
| Engine Type | 90°V8 |
| Cams | 4 |
| Valves/cyl | 4.0000 |
| Compression | "11,5" |
| Bore | 85.700 |
| Stroke | 64.800 |
| Capacity (cc) | 2990 |
| Power (at revs) | 490 HP/10750 |
| Torque | 353 Nm/9000 |
| Induction | |
| Ignition | Lucas |
| Fuel system | Lucas f.i. |
| Chassis type | Aluminium monocoque |
| Body type | single seater |
| Designer | M. Ogilvie/P. Wright |
| Front suspension | |
| Rear suspension | |
| Shock absorbers | Koni |
| Engine position | mid |
| Wheelbase (mm) | 2819 |
| Front track (mm) | 1803 |
| Rear track (mm) | 1676 |
| Weight (kg) | 588 |
| Drive | rear |
| Number of gears | 5 |
| Gearbox | Lotus-Hewland FGA 400 |
| Fuel tank size (litres) | |
| Brakes | |
| Front brake type | disc |
| Rear brake type | disc |
| Front rims | |
| Rear rims | |
| Tyres | Michelin |
| Front tyres | 23/59 - 13X |
| Rear tyres | 38/66 - 13X |
| Maximum speed (kph) | |
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