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
|
|
|||
| bodywork | |||
|---|---|---|---|
| Body type | 4 seater roadster | ||
| Number of doors | |||
| Designer | |||
| dimensions & weights | |||
| Wheelbase | 3251 mm | 128 inches | |
| Track/tread (front) | 1422 mm | 56 inches | |
| Track/tread (rear) | 1422 mm | 56 inches | |
| Length | |||
| Width | |||
| Height | |||
| Ground clearance | |||
| length:wheelbase ratio | |||
| Kerb weight | |||
| Weight distribution | |||
| fuel tank capacity | |||
| aerodynamics | |||
| Drag coefficient | |||
| Frontal area | |||
| CdA | |||
| Powertrain | |||
| engine type | naturally aspirated petrol | ||
| Engine manufacturer | National | ||
| Engine code | |||
| Cylinders | V 12 in 60° vee | ||
| Capacity | 6.1 litre 6062 cc (369.926 cu in) |
||
| Bore × Stroke | 73 × 120.7 mm
2.87 × 4.75 in |
||
| Bore/stroke ratio | 0.6 | ||
| Valve gear | side valve (SV)
2 valves per cylinder 24 valves in total |
||
| maximum power output | 73 PS (72 bhp) (54 kW) |
||
| maximum torque | |||
| Specific output | 8.9 kW/litre 12 ps/litre 11.9 bhp/litre 0.19 bhp/cu in |
||
| Engine construction | |||
| Lubrication | |||
| compression ratio | |||
| Fuel system | |||
| bmep (brake mean effective pressure) | |||
| Maximum RPM | |||
| crankshaft bearings | 3 | ||
| Engine coolant | Water | ||
| Unitary capacity | 505.17 cc | ||
| Aspiration | Normal | ||
| Compressor | N/A | ||
| Intercooler | None | ||
| Catalytic converter | N | ||
| performance | |||
| Acceleration 0-80km/h (50mph) | |||
| Acceleration 0-60mph | |||
| Acceleration 0-100km/h | |||
| Acceleration 0-160km/h (100mph) | |||
| Standing quarter-mile | |||
| Standing kilometre | |||
| Maximum speed | |||
| Power-to-weight ratio | |||
| Weight-to-power ratio | |||
| fuel consumption | |||
| Fuel consumption | |||
| universal fuel consumption (calculated from the above) | |||
| litres/100km | |||
| km/litre | |||
| UK MPG | |||
| US MPG | |||
| Carbon dioxide emissions | |||
| Carfolio Calculated CO2 ? | |||
| VED band (UK) | |||
| CO2 Effizienz (DE) | |||
| chassis | |||
| Engine position | front | ||
| Engine layout | longitudinal | ||
| Drive wheels | rear wheel drive | ||
| Torque split | N/A | ||
| Steering | |||
| turns lock-to-lock | |||
| Turning circle | |||
| Front suspension | |||
| Rear suspension | |||
| Wheel size front | |||
| Wheel size rear | |||
| Tyres front | 34 x 4½ | ||
| Tyres rear | 34 x 4½ | ||
| Brakes F/R | |||
| Front brake diameter | |||
| Rear brake diameter | |||
| Braked area | |||
| Gearbox | 3 speed manual | ||
| Top gear ratio | 1 | ||
| Final drive ratio | |||
| general | |||
| Carfolio.com ID | 195338 | ||
| Production total | |||
| Model code | |||
| RAC rating | 39.6 | ||
| Insurance classification | No information available | ||
| Tax band | No information available | ||
|
1917 National Twelve Roadster added 2009-02-05. Last modified 2013-02-28. |
|||