1977 Rolls-Royce Corniche Convertible
The Corniche nameplate stems from the originally French and Italian term for a coastal road, especially along the face of a cliff.
The car used the standard Rolls-Royce V8 engine. It had an aluminium-silicon alloy block and aluminium cylinder heads with cast iron wet cylinder liners. The bore was 4.1 in (104.1 mm) and the stroke was 3.9 in (99.1 mm) for a total of 6.75 L (6,750 cc/411 cuin). Twin SU carburettors were initially fitted, but were replaced with the "horribly complex" single Solex 4A1 four-barrel carburettor introduced in 1977. Desmogged export models retained the twin SU's until 1980, when Bosch fuel injection was added.
A three-speed automatic transmission (a Turbo Hydramatic 350 sourced from General Motors) was standard. A four-wheel independent suspension with coil springs was augmented with a hydraulic self-levelling system (using the same system as did Citroën, but without pneumatic springs, and with the hydraulic components built under licence by Rolls-Royce), at first on all four, but later on the rear wheels only. Four wheel disc brakes were specified, with ventilated discs added for 1972.
The car originally used a 119.75 in (3,042 mm) wheelbase. This was extended to 120 in (3,048 mm) in 1974 and 120.5 in (3,061 mm) in 1979.
The car was mildly revised in the spring of 1977. Difference included rack-and-pinion steering, alloy and rubber bumpers, aluminium radiator, oil cooler and a bi-level air conditioning system was added. Later changes included a modified rear independent suspension in March 1979. In March 1981, after the Silver Spirit had gone on sale, the Coupé version of the Corniche and its Bentley sister were discontinued. For 1985 there were also cosmetic and interior changes.
Corniche models received Bosch KE/K-Jetronic fuel injection in 1977. This engine, called the L410I, produced approximately 240 PS (177 kW) at just above 4,000 rpm for a top speed of 190 kilometres per hour (118 mph).