Background
Unlike its predecessors, the Bristol 406 suffered from a lack of power: Bristol's own 105 bhp in-line six-cylinder engine (type 110) no longer enabled the 1.5-ton car to achieve the sporty driving performance that distinguished earlier Bristol models. A further increase in performance of the engine, the concept of which dated back to before the Second World War, could no longer be achieved.
Bristol was therefore looking for a new engine in the second half of the 1950s. First, the company started to develop its own, new engine, designated type 160. The key requirement was a six-cylinder configuration and a displacement of 3.0 to 3.5 litres, similar to that of contemporary Alvis engines. However, the performance of the first prototypes was not convincing; in any case, the parent company was of the opinion that the financial expense of the new construction was not commensurate with its benefits. In 1959, Bristol tested another in-line Armstrong Siddeley six-cylinder engine. The 4.0 litre engine was standard in the Armstrong Siddeley Star Sapphire and produced 165 bhp. Bristol equipped a 406 with this engine and carried out some test runs at the factory. However, there was no takeup into series production. The prototype went on sale and was in regular use until 1975. In 2015 it was rediscovered in an unrestored condition. [2] In the end, Bristol decided to use Chrysler's US eight-cylinder engine. It is not clear from whom the initiative to use American engines came. Bristol owner Tony Crook repeatedly told the following story: Actually, Bristol only wanted to order a Torque-Flite automatic transmission for test purposes. To the surprise of the Bristol employees, Chrysler would have included an in-house eight-cylinder in addition to the ordered gearbox. Bristol then subjected the engine to in-depth tests and decided in favour of using the American engine in view of the high performance and cost-effectiveness of the concept – which meant saving its own development costs. [3] To further cost saving, Bristol did not source the engines directly from the US but from Canada, a member of the Commonwealth. This meant that there were no import duties when the engines were transferred to the UK.
The Bristol engine was based on an older American engine, which had made its debut at Chrysler's Plymouth brand in 1956 and originally had a displacement of 260 CID (4.2 litres). Bristol obtained the engine blocks from the USA and had them completed by hand in a Canadian Chrysler workshop. At the same time, a series of far-reaching modifications were carried out to distinguish the Bristol engines from their large-series counterparts: The engine bore was increased from 3.56 inches to 3.87 inches. This resulted in a displacement of 5.2 litres – with only a marginally changed stroke; Chrysler did not have an engine of the appropriate size in its series portfolio. The engines were given a new cylinder head designed by Bristol, which replaced the original "polyspherical" head of the Plymouth product.
Finally, the intake ducts were revised. The engine delivered an output of 250hp after the manual modifications, which more than doubled the performance potential compared to the previous model. Bristol was again on the way to becoming a sports car manufacturer. The switch to American engines was problematic. This step was not without a model: Facel Vega from France had already taken this route a few years earlier, and the British competitor Jensen was about to do the same. The conservative British clientele was nevertheless sceptical and, according to Tony Crook, quite a few are said to have seen it as a sin. Most critics, however, were reconciled by the outstanding driving performance of the car. Bristol's long-serving 2.0 litre six-cylinder engine continued to be built for some time after the introduction of the 407. It was primarily supplied to AC Cars, where it was installed in the Ace, Aceca and Greyhound models until the end of 1962. The new V8 engine was mated to a TorqueFlite automatic gearbox as the only transmission option. The transmission had three forward speeds and a torque converter.
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The Bristol 404 and Bristol 405 are British luxury cars which were manufactured by the Bristol Aeroplane Company. The 404 was manufactured from 1953 to 1958, and the 405 from 1955 to 1958. The models were successors to the Bristol 403. The 404 was a two-seat coupé and the 405 was available as a four-seat, four-door saloon and as a four-seat, two-door drophead coupé.
The Bristol 406 was a luxury car produced between 1958 and 1961 by British manufacturer Bristol Aeroplane Co. Their cars were constructed to very high engineering standards and were intended to be long-lasting to justify their very high price. Buyers might arrange considerable changes to the specification of their own particular vehicle. Bristol Aeroplane's car division later became Bristol Cars.
The Bristol 408 is a British luxury car made by Bristol Cars between 1963 and 1966. Unusually for Bristol, a slightly revised version was launched during the middle of the model's production run in 1965 and known as the 408 Mark II.
The Bristol 409 was the third series of cars from British manufacturer Bristol Cars powered by Chrysler V8 engines. It was actually introduced before the older Bristol 408 went out of production and only gradually supplanted that model after a year.
The Bristol 410 was the fourth series of Chrysler V8-engined models from British manufacturer Bristol Cars. It was the last Bristol to use the 5.2-litre (318 cubic-inch) engine originally found in the Bristol 407.
The Bristol 412 is a car which was produced by British manufacturer Bristol Cars from 1975 to 1986. Variants were produced as the Bristol Beaufighter, from 1980 to 1993, and as the Bristol Beaufort, from 1984 to 1994.
The Chrysler CM Valiant is an automobile that was produced in Australia by Chrysler Australia from 1978 to 1980 and subsequently by Mitsubishi Australia from 1980 to 1981. It was a facelifted and revised version of the Chrysler CL Valiant, which it replaced. It was the last Australian Chrysler Valiant.
The Bristol 406 Zagato is a British-Italian sports car that combines the technology of the Bristol 406 Saloon with a body designed and built by Zagato. This special model, often considered eccentric, was commissioned by Bristol dealer Tony Crook and was produced in very limited quantities. It is known for being lighter, smaller, and faster than the factory-bodied base car. In addition, some older Bristol chassis also subsequently received similar Zagato bodies. Today, the 406 Zagato is considered one of the most expensive classics within the brand’s lineup.
