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    The transition from carburettor to fuel injection and the introduction of new anti-pollution laws all had a sizeable impact on the power of the 308 GTBi compared to its predecessor, the 308 GTB. Research to remedy this situation was quickly undertaken and soon showed that four valves per cylinder offered the optimal solution. This innovation saw the engine make up its lost horsepower and the car regain position as the reference point in its category.

    Ferrari 308 GTB Quattrovalvole

    The transition from carburettor to fuel injection and the introduction of new anti-pollution laws all had a sizeable impact on the power of the 308 GTBi compared to its predecessor, the 308 GTB. Research to remedy this situation was quickly undertaken and soon showed that four valves per cylinder offered the optimal solution. This innovation saw the engine make up its lost horsepower and the car regain position as the reference point in its category.

    The design

    The design

    The 308 GTB Quattrovalvole succeeded the 308 GTBi, and was presented at the 1982 Paris Salon. The Quattrovalvole part of the model name referred to the four valves per cylinder heads on the engine, which provided increased power over the preceding model.

    Ferrari 308 GTB Quattrovalvole-design-focus

    Visually the new model was very similar to the outgoing one, but could be recognised by the addition of a slim louvre panel in the front lid to aid radiator exhaust air exit, paired electrically operated door mirrors with a small enamel Ferrari badge on the shell, a revised radiator grille with rectangular driving lights at the extremities, and rectangular (instead of round) side repeater lights.

    Ferrari 308 GTB Quattrovalvole-design-focus-2

    The interior also received some minor alterations, and cloth seat centres became available as an option to the standard full leather, whilst the leather rim satin black three spoke steering wheel featured a triangulated section around the horn push. As with the preceding series’ of 308 models, USA market cars could be identified by heavier bumper assemblies, and rectangular side marker lights on the wings. Options available were metallic paint, a deep front spoiler, air conditioning, wider wheels, 16″ Speedline wheels with Pirelli P7 tyres, and a rear of roof satin black finished aerofoil (standard on Japanese market models).

    Ferrari 308 GTB Quattrovalvole-design-focus-3
    1design

    The design

    The chassis and the engine

    The chassis and the engine

    The V8 engine was essentially of the same design as that used in the 308 GTBi model, apart from the four valves per cylinder heads. It was of a 90 degree configuration, with belt driven twin overhead camshafts per bank, having a total capacity of 2926cc, with a bore and stroke of 81mm x 71mm, with wet sump lubrication, bearing factory type reference F 105 AB 000 for European market cars.
    The claimed power output for main market European cars was 240bhp at 7000rpm, and 235bhp at 6800rpm for US market variants. 

    Ferrari 308 GTB Quattrovalvole-engine-focus

    The engine was transversely mounted in unit with the all synchromesh five speed transmission assembly, which was below, and to the rear of the engine’s sump.
    The gear and final drive ratios were altered to suit the revised characteristics of the four valves per cylinder engine. It was fitted with a Bosch K Jetronic fuel injection system, coupled to a Marelli MED 803A Digiplex electronic ignition system, incorporating a coil, distributor and ignition module to serve each bank of cylinders. All US market examples were fitted with catalytic convertors.

    Ferrari 308 GTB Quattrovalvole-engine-focus-2

    The main European market 308 GTB Quattrovalvole models had a tubular chassis with factory type reference F 105 GB 100, Disc brakes, with independent suspension via wishbones, coil springs, and hydraulic shock absorbers, were provided all round, with front and rear anti roll bars.
    All models were numbered in the Ferrari odd number road car chassis sequence of the time, with right and left hand drive available. The model was produced in a total of 748 examples between 1982 and 1985 in the chassis number range 42809 to 59071.

    Ferrari 308 GTB Quattrovalvole-engine-focus-3
    2Chassis and engine

    The chassis and the engine

    3Technical Details
    • V8
      ENGINE
    • 2926.90 cc
      TOTAL DISPLACEMENT
    • 176 kW
      MAXIMUM POWER @ 7000 rpm
    • 255 km/h
      TOP SPEED
    Engine
    • Typerear, transverse, 90° V8
    • Bore/stroke81 x 71mm
    • Unitary displacement365.86cc
    • Total displacement2926.90cc
    • Compression ratio9.2 : 1
    • Maximum power176 kW (240 hp) at 7000 rpm
    • Power per litre82hp/l
    • Maximum torque260 Nm (26.5 kgm) at 5000 rpm
    • Valve actuationtwin overhead camshafts per bank, four valves per cylinder
    • Fuel feedBosch K-Jetronic injection
    • Ignitionelectronic, single spark plug per cylinder
    • Lubricationwet sump
    • Clutchsingle-plate
    Chassis
    • Frametubular steel
    • Front suspensionindependent, unequal-length wishbones, coil springs over telescopic shock absorbers, anti-roll bar
    • Rear suspensionindependent, unequal-length wishbones, coil springs over telescopic shock absorbers, anti-roll bar
    • Brakesdiscs
    • Transmission5-speed + reverse
    • Steeringrack-and-pinion
    • Fuel tankcapacity 74litres
    • Front tyres205/55 VR 16
    • Rear tyres225/50 VR 16
    Bodywork
    • Typetwo-seater berlinetta
    • Length4230mm
    • Width1720mm
    • Height1120mm
    • Wheelbase2340mm
    • Front track1460mm
    • Rear track1460mm
    • Weight1275kg (dry)
    Performance
    • Top speed255km/h
    • Acceleration 0-100 km/h-
    • 0-400 m14.5sec
    • 0-1000 m26.2sec
    4Media Gallery
      • design
      • Chassis and engine
      • Technical Details
      • Media Gallery
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      Ferrari S.p.A. - A company under Italian law, having its registered office at Via Emilia Est No. 1163, Modena, Italy, Companies’ Register of Modena, VAT and Tax number 00159560366 and share capital of Euro 20,260,000

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