The American Underslung 646 Touring is a tourer with 4 doors and a front mounted powerplant which transmits its power to the rear wheels.
It is powered by a naturally aspirated engine of 7.7 litre capacity. This unit features side valve valve gear, 6 cylinder layout, and 2 valves per cylinder.
The power is transferred to the wheels via a 4 speed manual gearbox.
Full specs
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| bodywork | |||
|---|---|---|---|
| Body type | 6/7 seater tourer | ||
| Number of doors | 4 | ||
| Designer | |||
| dimensions & weights | |||
| Wheelbase | 3556 mm | 140 inches | |
| Track/tread (front) | |||
| Track/tread (rear) | |||
| 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 | American Underslung | ||
| Engine code | |||
| Cylinders | Straight 6 | ||
| Capacity | 7.7 litre 7679 cc (468.601 cu in) |
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| Bore × Stroke | 108 × 139.7 mm
4.25 × 5.5 in |
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| Bore/stroke ratio | 0.77 | ||
| Valve gear | side valve (SV)
2 valves per cylinder 12 valves in total |
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| maximum power output | |||
| maximum torque | |||
| Engine construction | |||
| Lubrication | |||
| compression ratio | |||
| Fuel system | 1 Rayfield carburettor | ||
| bmep (brake mean effective pressure) | |||
| Maximum RPM | |||
| crankshaft bearings | |||
| Engine coolant | Water | ||
| Unitary capacity | 1279.83 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 | 38 x 4½ | ||
| Tyres rear | 38 x 4½ | ||
| Brakes F/R | |||
| Front brake diameter | |||
| Rear brake diameter | |||
| Braked area | |||
| Gearbox | 4 speed manual | ||
| Top gear ratio | |||
| Final drive ratio | |||
| general | |||
| Carfolio.com ID | 453222 | ||
| Production total | |||
| Model code | |||
| RAC rating | 43.4 | ||
| Insurance classification | No information available | ||
| Tax band | No information available | ||
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1913 American Underslung 646 Touring added 2016-01-05. Last modified 2022-12-20. |
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