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BMW 3.0 CSL

The BMW New Six CS (internal name BMW E9) was a two-door coupé built for BMW by Karmann from 1968 to 1975. It was developed from the New Class-based BMW 2000CS coupé, which was enlarged to hold the BMW M30 straight-6 engine used in the E3 sedan.

The E9 platform, especially the 3.0CSL homologation special, was very successful in racing, especially in European Touring Car Championship and the Deutsche Rennsport Meisterschaft. This helped to establish BMW's status as a sporty driver's car.

2000C and 2000CS

The BMW 2000C and 2000CS were introduced In 1965. Based on the New Class, the 2000C and CS were Karmann-built coupés featuring the then-new two litre version of the M10 engine. The 2000C had a single carburettor engine that produced 100 horsepower (75 kW), and was available with either manual or automatic trasmission, while the 2000CS had a two carburettor engine that produced 120 horsepower (89 kW) and was available only with a manual transmission.

2800CS

The first of the E9 coupés, the 2800CS, replaced the 2000C and 2000CS in 1968. The wheelbase and length were increased to allow the engine bay to be long enough to accommodate the new straight-six engine code-named M30, and the front of the car was restyled to resemble the E3 sedan. The 2800CS used the 2,788 cc (170.1 cu in) version of the engine used in the E3 sedans. The engine produced 170 horsepower (130 kW) at 6000 revolutions per minute.

3.0CS and variants

The 2800CS was replaced by the 3.0CS and 3.0CSi in 1971. The engine had been bored out to give a displacement of 2,986 cc (182.2 cu in), and was offered with a 9.0:1 compression ratio, twin carburettors, and 180 horsepower (130 kW) at 6000 revolutions per minute in the 3.0CS or a 9.5:1 compression ratio, Bosch D-Jetronic fuel injection, and 200 horsepower (150 kW) at 5500 revolutions per minute in the 3.0CSi.

3.0 CSL

Introduced in May 1972, the 3.0CSL was a homologation special built to make the car eligible for racing in the European Touring Car Championship. The "L" in the designation meant "leicht" (light), unlike in other BMW designations, where it meant "lang" (long). The lightness was achieved by using thinner steel to build the unit body, deleting the trim and soundproofing, using aluminium alloy doors, bonnets, and boot lids, and using Perspex side windows. The five hundred 3.0CSLs exported to the United Kingdom were not quite as light as the others, as the importer had insisted on retaining the soundproofing, electric windows, and stock E9 bumpers on these cars.

Initially using the same engine as the 3.0CS, the 3.0CSL was given a very small increase in displacement to 3,003 cc (183.3 cu in) by increasing the engine bore by one quarter of a millimetre. This was done in August 1972 to allow the CSL to be raced in the "over three litre" racing category, allowing for some increase in displacement in the racing cars. In 1973, the engine in the 3.0CSL was given another, more subtantial increase in displacement to 3,153 cc (192.4 cu in) by increasing the stroke to 84 mm (3.3 in). This final version of the 3.0CSL was homologated in July 1973 along with an aerodynamic package including a large air dam, short fins running along the front fenders, a spoiler above and behind the trailing edge of the roof, and a tall rear wing.The rear wings were not installed at the factory, but were left in the boot for installation after purchase. This was done because the wings were illegal for use on German roads. The full aero package earned the racing CSLs the nickname "Batmobile".

In 1973, Toine Hezemans won the European Touring Car Championship in a 3.0CSL and co-drove a 3.0CSL with Dieter Quester to a class victory at Le Mans. Hezemans and Quester had driven to second place at the 1973 German Touring Car Grand Prix at Nürburgring, being beaten only by Chris Amon and Hans-Joachim Stuck in another 3.0CSL. 3.0 CSLs would win the European Touring Car Championship again in every year from 1975 to 1979.

The first two BMW Art Cars were 3.0CSLs; the first was painted by Alexander Calder and the second by Frank Stella.

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