The Fairthorpe EM Mk IV is a convertible/cabriolet with 2 doors and a front mounted engine which transmits the power through the rear wheels.
It is powered by a naturally aspirated engine of 1.3 litre capacity. This unit features overhead valve valve gear, 4 cylinder layout, and 2 valves per cylinder. It has an output of 75 bhp (76 PS/56 kW) of power at 6000 rpm, and maximum torque of 102 N·m (75 lb·ft/10.4 kgm) at 4000 rpm.
The engine powers the wheels via a 4 speed manual transmission.
Its claimed weight at the kerb is 490 kg.
Full specs
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| bodywork | |||
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| Body type | 2 seater convertible/cabriolet | ||
| Number of doors | 2 | ||
| Designer | |||
| dimensions & weights | |||
| Wheelbase | 2134 mm | 84 inches | |
| Track/tread (front) | 1220 mm | 48 inches | |
| Track/tread (rear) | 1220 mm | 48 inches | |
| Length | 3632 mm | 143 inches | |
| Width | 1473 mm | 58 inches | |
| Height | 1168 mm | 46 inches | |
| Ground clearance | 102 mm | 4 inches | |
| length:wheelbase ratio | 1.7 | ||
| Kerb weight | 490 kg | 1080 lb | |
| Weight distribution | |||
| fuel tank capacity | 40.9 litres | 9 [10.8] UK [US] gal. | |
| aerodynamics | |||
| Drag coefficient | |||
| Frontal area | |||
| CdA | |||
| Powertrain | |||
| engine type | naturally aspirated petrol | ||
| Engine manufacturer | Triumph | ||
| Engine code | |||
| Cylinders | Straight 4 | ||
| Capacity | 1.3 litre 1296 cc (79.087 cu in) |
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| Bore × Stroke | 73.7 × 76 mm
2.9 × 2.99 in |
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| Bore/stroke ratio | 0.97 | ||
| Valve gear | overhead valve (OHV)
2 valves per cylinder 8 valves in total |
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| maximum power output (DIN) |
76 PS (75 bhp) (56 kW) at 6000 rpm |
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| maximum torque (DIN) |
102 Nm (75 ft·lb) (10.4 kgm) at 4000 rpm |
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| Specific output (DIN) |
43.2 kW/litre 58.7 ps/litre 57.9 bhp/litre 0.95 bhp/cu in |
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| Specific torque (DIN) |
78.7 Nm/litre
0.95 ft·lb/cu3 |
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| Engine construction | |||
| Lubrication | |||
| compression ratio | 9.5:1 | ||
| Fuel system | 2 SU carbs | ||
| bmep (brake mean effective pressure) | 989 kPa (143.4 psi) | ||
| Maximum RPM | |||
| crankshaft bearings | 3 | ||
| Engine coolant | Water | ||
| Unitary capacity | 324 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 155.19 PS/tonne (1000 kg) 0.16 PS/kg 114.14 kW/tonne (1000 kg) 0.11 kW/kg 153.06 bhp/tonne (1000 kg) 0.15 bhp/kg 0.07 bhp/lb |
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| Weight-to-power ratio | Lower is better 8.76 kg/kW 14.63 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 | rack & pinion | ||
| turns lock-to-lock | 4.500 | ||
| Turning circle | 7.00 m | ||
| Front suspension | I.W.CS.ARB. | ||
| Rear suspension | LA.CS. | ||
| Wheel size front | |||
| Wheel size rear | |||
| Tyres front | |||
| Tyres rear | |||
| Brakes F/R | Di/Dr | ||
| Front brake diameter | |||
| Rear brake diameter | |||
| Braked area | 1626 cm2 | ||
| Gearbox | 4 speed manual | ||
| Top gear ratio | 1 | ||
| Final drive ratio | 4.11 | ||
| general | |||
| Carfolio.com ID | 46849 | ||
| Production total | |||
| Model code | |||
| RAC rating | 13.5 | ||
| Insurance classification | No information available | ||
| Tax band | No information available | ||
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1969 Fairthorpe EM Mk IV added before December 1995. Last modified 2013-02-28. |
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