The Pontiac Bonneville Hardtop 428 is a 4 door saloon (sedan)-bodied car with a front mounted engine driving through the rear wheels.
The Bonneville Hardtop 428 is part of Pontiac's 262 family of cars.
The 8 cylinder, overhead valve naturally aspirated engine has 2 valves per cylinder and a capacity of 7 litres. For this model it provides power and torque figures of 375 bhp (380 PS/280 kW) at 4800 rpm and 640 Nm (472 lbft/65.3 kgm) at 3200 rpm respectively.
This power is delivered to the wheels through a 3 speed automatic gearbox.
Full specs
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| bodywork | |||
|---|---|---|---|
| Body type | 4/5 seater sedan/saloon | ||
| Number of doors | 4 | ||
| Designer | |||
| dimensions & weights | |||
| Wheelbase | 3150 mm | 124 inches | |
| Track/tread (front) | 1600 mm | 63 inches | |
| Track/tread (rear) | 1626 mm | 64 inches | |
| Length | 5677 mm | 223.5 inches | |
| Width | 2027 mm | 79.8 inches | |
| Height | 1367 mm | 53.8 inches | |
| Ground clearance | |||
| length:wheelbase ratio | 1.8 | ||
| Kerb weight | |||
| Weight distribution | |||
| fuel tank capacity | |||
| aerodynamics | |||
| Drag coefficient | |||
| Frontal area | |||
| CdA | |||
| Powertrain | |||
| engine type | naturally aspirated petrol | ||
| Engine manufacturer | Pontiac | ||
| Engine code | |||
| Cylinders | V 8 in 90° vee | ||
| Capacity | 7 litre 6991 cc (426.617 cu in) |
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| Bore × Stroke | 104.65 × 101.6 mm
4.12 × 4 in |
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| Bore/stroke ratio | 1.03 | ||
| Valve gear | overhead valve (OHV)
2 valves per cylinder 16 valves in total |
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| maximum power output (gross) |
380 PS (375 bhp) (280 kW) at 4800 rpm |
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| maximum torque (gross) |
640 Nm (472 ft·lb) (65.3 kgm) at 3200 rpm |
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| Specific output (gross) |
40 kW/litre 54.4 ps/litre 53.6 bhp/litre 0.88 bhp/cu in |
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| Specific torque (gross) |
91.55 Nm/litre
1.11 ft·lb/cu3 |
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| Engine construction | |||
| Lubrication | wet sumped | ||
| compression ratio | 10.5:1 | ||
| Fuel system | 1 carburettor | ||
| bmep (brake mean effective pressure) | 1150.4 kPa (166.9 psi) | ||
| Maximum RPM | |||
| crankshaft bearings | 5 | ||
| Engine coolant | Water | ||
| Unitary capacity | 873.88 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 | 6JK x 14 | ||
| Wheel size rear | 6JK x 14 | ||
| Tyres front | 8.55 x 14 | ||
| Tyres rear | 8.55 x 14 | ||
| Brakes F/R | Dr/Dr | ||
| Front brake diameter | 279 mm | ||
| Rear brake diameter | 279 mm | ||
| Braked area | |||
| Gearbox | 3 speed automatic | ||
| Top gear ratio | 1 | ||
| Final drive ratio | 3.08 | ||
| general | |||
| Carfolio.com ID | 343838 | ||
| Production total | |||
| Model code | 26239 | ||
| Model family | 262 | ||
| RAC rating | 54.3 | ||
| Insurance classification | No information available | ||
| Tax band | No information available | ||
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1968 Pontiac Bonneville Hardtop 428 Automatic added 2013-07-15. Last modified 2020-06-10. |
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