The Plymouth Road Runner 426 Hemi is a coupé with 2 doors and a front mounted engine which delivers its power through the rear wheels.
It is powered by a naturally aspirated engine of 7 litre capacity. This powerplant features overhead valve valve gear, a 90 degree V 8 cylinder layout, and 2 valves per cylinder. It has an output of 425 bhp (431 PS/317 kW) of power at 5000 rpm, and maximum torque of 665 N·m (490 lb·ft/67.8 kgm) at 4000 rpm.
This power is transferred to the wheels via a 4 speed manual transmission.
Full specs
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| bodywork | |||
|---|---|---|---|
| Body type | 4/5 seater fixed-head coupé | ||
| Number of doors | 2 | ||
| Designer | |||
| dimensions & weights | |||
| Wheelbase | 2921 mm | 115 inches | |
| Track/tread (front) | 1527 mm | 60.1 inches | |
| Track/tread (rear) | 1575 mm | 62 inches | |
| Length | 5161 mm | 203.2 inches | |
| Width | 2009 mm | 79.1 inches | |
| Height | 1339 mm | 52.7 inches | |
| Ground clearance | 137 mm | 5.4 inches | |
| length:wheelbase ratio | 1.77 | ||
| Kerb weight | |||
| Weight distribution | |||
| fuel tank capacity | |||
| aerodynamics | |||
| Drag coefficient | |||
| Frontal area | |||
| CdA | |||
| Powertrain | |||
| engine type | naturally aspirated petrol | ||
| Engine manufacturer | Chrysler | ||
| Engine code | |||
| Cylinders | V 8 in 90° vee | ||
| Capacity | 7 litre 6974 cc (425.58 cu in) |
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| Bore × Stroke | 107.95 × 95.25 mm
4.25 × 3.75 in |
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| Bore/stroke ratio | 1.13 | ||
| Valve gear | overhead valve (OHV)
2 valves per cylinder 16 valves in total |
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| maximum power output (SAE gross) |
431 PS (425 bhp) (317 kW) at 5000 rpm |
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| maximum torque (SAE gross) |
665 Nm (490 ft·lb) (67.8 kgm) at 4000 rpm |
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| Specific output (SAE gross) |
45.4 kW/litre 61.8 ps/litre 60.9 bhp/litre 1 bhp/cu in |
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| Specific torque (SAE gross) |
95.35 Nm/litre
1.15 ft·lb/cu3 |
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| Engine construction | |||
| Lubrication | wet sumped | ||
| compression ratio | 10.2:1 | ||
| Fuel system | |||
| bmep (brake mean effective pressure) | 1198.3 kPa (173.8 psi) | ||
| Maximum RPM | |||
| crankshaft bearings | 5 | ||
| Engine coolant | Water | ||
| Unitary capacity | 871.75 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 | 6.0JJ x 14 | ||
| Wheel size rear | 6.0JJ x 14 | ||
| Tyres front | F70 x 14 2B/2 | ||
| Tyres rear | F70 x 14 2B/2 | ||
| Brakes F/R | Dr/Dr | ||
| Front brake diameter | 279 mm | ||
| Rear brake diameter | 279 mm | ||
| Braked area | |||
| Gearbox | 4 speed manual | ||
| Top gear ratio | 1 | ||
| Final drive ratio | 3.54 | ||
| general | |||
| Carfolio.com ID | 827585 | ||
| Production total | |||
| Model code | RM23 | ||
| RAC rating | 57.8 | ||
| Insurance classification | No information available | ||
| Tax band | No information available | ||
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1971 Plymouth Road Runner 426 Hemi added 2025-03-01. Last modified 2025-03-09. |
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