It's powered courtesy of a naturally aspirated engine of 3.2 litre capacity. This unit features side valve valve gear, 4 cylinder layout, and 2 valves per cylinder. It produces 36 bhp (36.5 PS/26.8 kW) of power at 1800 rpm.
The power is supplied to the wheels via a 3 speed manual transmission.
The Birch Super Four weighs a claimed 998 kg at the kerb.
Full specs
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| bodywork | |||
|---|---|---|---|
| Body type | |||
| Number of doors | |||
| Designer | |||
| dimensions & weights | |||
| Wheelbase | 2921 mm | 115 inches | |
| Track/tread (front) | |||
| Track/tread (rear) | |||
| Length | |||
| Width | |||
| Height | |||
| Ground clearance | |||
| length:wheelbase ratio | |||
| Kerb weight | 998 kg | 2200 lb | |
| Weight distribution | |||
| fuel tank capacity | |||
| aerodynamics | |||
| Drag coefficient | |||
| Frontal area | |||
| CdA | |||
| Powertrain | |||
| engine type | naturally aspirated petrol | ||
| Engine manufacturer | Lycoming | ||
| Engine code | |||
| Cylinders | Straight 4 | ||
| Capacity | 3.2 litre 3153 cc (192.408 cu in) |
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| Bore × Stroke | 88.9 × 127 mm
3.5 × 5 in |
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| Bore/stroke ratio | 0.7 | ||
| Valve gear | side valve (SV)
2 valves per cylinder 8 valves in total |
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| maximum power output | 36.5 PS (36 bhp) (26.8 kW) at 1800 rpm |
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| maximum torque | |||
| Specific output | 8.5 kW/litre 11.6 ps/litre 11.4 bhp/litre 0.19 bhp/cu in |
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| Engine construction | |||
| Lubrication | wet sumped | ||
| compression ratio | |||
| Fuel system | 1 Zenith carburettor | ||
| bmep (brake mean effective pressure) | |||
| Maximum RPM | |||
| crankshaft bearings | 2 | ||
| Engine coolant | Water | ||
| Unitary capacity | 788.25 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 | Higher is better 36.57 PS/tonne (1000 kg) 0.04 PS/kg 26.9 kW/tonne (1000 kg) 0.03 kW/kg 36.07 bhp/tonne (1000 kg) 0.04 bhp/kg 0.02 bhp/lb |
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| Weight-to-power ratio | Lower is better 37.18 kg/kW 62.1 lb/bhp |
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| 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 | 32 x 3½ | ||
| Tyres rear | 32 x 3½ | ||
| Brakes F/R | |||
| Front brake diameter | |||
| Rear brake diameter | |||
| Braked area | |||
| Gearbox | 3 speed manual | ||
| Top gear ratio | 1 | ||
| Final drive ratio | 4.25 | ||
| general | |||
| Carfolio.com ID | 207647 | ||
| Production total | |||
| Model code | |||
| RAC rating | 19.6 | ||
| Insurance classification | No information available | ||
| Tax band | No information available | ||
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1919 Birch Super Four added 2010-02-18. Last modified 2013-02-28. |
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