The Buick Roadmaster Hardtop is a rear wheel drive automobile, with the powerplant located in the front, and a 4 door saloon (sedan) bodyshell.
The Buick Roadmaster Hardtop is one of the Series 70 model family from Buick.
Power is supplied by an overhead valve, 6 litre naturally aspirated 8 cylinder powerplant, with 2 valves per cylinder that develops power and torque figures of 300 bhp (304 PS/224 kW) at 4600 rpm and 542 N·m (400 lb·ft/55.3 kgm) at 3200 rpm respectively.
A 2 speed automatic transmission transmits the power to the wheels.
Full specs
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| bodywork | |||
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| Body type | 4/5 seater sedan/saloon | ||
| Number of doors | 4 | ||
| Designer | |||
| dimensions & weights | |||
| Wheelbase | 3239 mm | 127.5 inches | |
| Track/tread (front) | 1511 mm | 59.5 inches | |
| Track/tread (rear) | 1506 mm | 59.3 inches | |
| Length | 5469 mm | 215.3 inches | |
| Width | 1971 mm | 77.6 inches | |
| Height | 1549 mm | 61 inches | |
| Ground clearance | |||
| length:wheelbase ratio | 1.69 | ||
| Kerb weight | |||
| Weight distribution | |||
| fuel tank capacity | 75.8 litres | 16.7 [20] UK [US] gal. | |
| aerodynamics | |||
| Drag coefficient | |||
| Frontal area | |||
| CdA | |||
| Powertrain | |||
| engine type | naturally aspirated petrol | ||
| Engine manufacturer | Buick | ||
| Engine code | |||
| Cylinders | V 8 in 90° vee | ||
| Capacity | 6 litre 5957 cc (363.518 cu in) |
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| Bore × Stroke | 104.78 × 86.36 mm
4.13 × 3.4 in |
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| Bore/stroke ratio | 1.21 | ||
| Valve gear | overhead valve (OHV)
2 valves per cylinder 16 valves in total |
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| maximum power output (gross) |
304 PS (300 bhp) (224 kW) at 4600 rpm |
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| maximum torque (gross) |
542 Nm (400 ft·lb) (55.3 kgm) at 3200 rpm |
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| Specific output (gross) |
37.6 kW/litre 51.1 ps/litre 50.4 bhp/litre 0.83 bhp/cu in |
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| Specific torque (gross) |
90.99 Nm/litre
1.1 ft·lb/cu3 |
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| Engine construction | |||
| Lubrication | wet sumped | ||
| compression ratio | 10:1 | ||
| Fuel system | 1 Carter 2507 carburettor | ||
| bmep (brake mean effective pressure) | 1143.4 kPa (165.8 psi) | ||
| Maximum RPM | |||
| crankshaft bearings | 5 | ||
| Engine coolant | Water | ||
| Unitary capacity | 744.63 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 | 6L x 15 | ||
| Wheel size rear | 6L x 15 | ||
| Tyres front | 8.00-15 | ||
| Tyres rear | 8.00-15 | ||
| Brakes F/R | Dr/Dr-S | ||
| Front brake diameter | 305 mm | ||
| Rear brake diameter | 305 mm | ||
| Braked area | |||
| Gearbox | 2 speed automatic | ||
| Top gear ratio | 1 | ||
| Final drive ratio | 3.07 | ||
| general | |||
| Carfolio.com ID | 795993 | ||
| Production total | |||
| Model code | 73/57-4739 | ||
| Model family | Series 70 | ||
| RAC rating | 54.5 | ||
| Insurance classification | No information available | ||
| Tax band | No information available | ||
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1957 Buick Roadmaster Hardtop added 2023-04-29. Last modified 2023-04-29. |
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