The Twelve Roadster is a motor car from National, with rear wheel drive, a front located engine and a roadster body style.
The 6.1 litre engine is a naturally aspirated, side valve, 12 cylinder unit that has an output of 72 bhp (73 PS/54 kW) of power.
The power is delivered to the wheels via a 3 speed manual transmission.
Full specs
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| Carrocería | |||
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| Carrocería | 4 seater roadster | ||
| Número de puertas | |||
| diseñado por | |||
| Dimensiones y pesos | |||
| Distancia entre ejes | 3251 | 128 | |
| Vía delantera | 1422 | 56 | |
| Vía trasera | 1422 | 56 | |
| Longitud | |||
| Ancho | |||
| Altura | |||
| Despeje del suelo | |||
| Relación Largo:Dist.entre ejes | |||
| Peso en vacío | |||
| Distribución del peso (% adelante) | |||
| Capacità serbatoio | |||
| Aerodinámica | |||
| Coeficiente de penetración | |||
| Superficie frontal | |||
| SCx | |||
| Tren motriz | |||
| naturally aspirated petrol | |||
| Fabricante del motor | National | ||
| Código de motor | |||
| Número de cilindros | V 12 in 60° vee | ||
| Cilindrada | 6.1 litre 6062 cc (369.926 cu in) |
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| Diámetro × Carrera | 73 × 120.7 mm
2.87 × 4.75 in |
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| Relación diámetro/carrera | 0.6 | ||
| Distribución | side valve (SV)
2 válvulas por cilindro 24 Total de válvulas |
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| Potencia nominal | 73 PS (72 bhp) (54 kW) |
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| Par motor máximo | |||
| Potencia específica | 8.9 kW/litre 12 ps/litre 11.9 bhp/litre 0.19 bhp/cu in |
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| Materiales de block / culata | |||
| Lubricación | |||
| Relación de compresión | |||
| Alimentación | |||
| Maximum RPM | |||
| Casquillos de cigüeñal | 3 | ||
| Engine coolant | Water | ||
| 505.17 cc | |||
| Aspiración | Normal | ||
| Compresor | N/A | ||
| intercooler | None | ||
| catalizador | N | ||
| Rendimiento | |||
| 0-80km/h | |||
| 0-60mph | |||
| 0-100km/h | |||
| 0-160km/h | |||
| 0-400m | |||
| 0-1000m | |||
| Velocidad máxima | |||
| Power-to-weight ratio | |||
| Weight-to-power ratio | |||
| Consumos | |||
| Consumo de combustible | |||
| universal fuel consumption (calculated from the above) | |||
| litres/100km | |||
| km/litre | |||
| UK MPG | |||
| US MPG | |||
| Emisiones de CO2 | |||
| Carfolio Calculated CO2 ? | |||
| VED band (UK) | |||
| CO2 Effizienz (DE) | |||
| Chasis | |||
| Ubicación del motor | front | ||
| Engine layout | longitudinal | ||
| Tracción | rear wheel drive | ||
| Alimentación | N/A | ||
| Dirección, tipo | |||
| turns lock-to-lock | |||
| Turning circle | |||
| Suspensión delantera | |||
| Suspensión trasera | |||
| Ruedas delante | |||
| Ruedas detrás | |||
| Neumáticos delante | 34 x 4½ | ||
| Neumáticos detrás | 34 x 4½ | ||
| Brakes F/R | |||
| Front brake diameter | |||
| Rear brake diameter | |||
| Braked area | |||
| Transmisión | 3 speed manual | ||
| Eje trasero desmultiplicación | 1 | ||
| Desmultiplicación grupo cónico | |||
| General | |||
| Carfolio.com ID | 195338 | ||
| Unidades producidas | |||
| Model code | |||
| RAC rating | 39.6 | ||
| Insurance classification | No information available | ||
| Tax band | No information available | ||
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1917 National Twelve Roadster added 2009-02-05. Last modified 2013-02-28. |
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