Simon Alexander, der seinen Blue, 1973, BMW CSL 3,0, für die Adrian Flux Trophy für MRL Historic Touring Cars beim Silverstone Classic 2021 qualifizierte
Introduced in May 1972, the 3.0 CSL was a homologation special built to make the car eligible for racing in the European Touring Car Championship. 1, 265 were built. 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 aluminum alloy doors, bonnet, and boot lid, and using Perspex side windows. The five hundred 3.0 CSLs 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. The CSL was not sold in the United States. Initially using the same engine as the 3.0 CS, the 3.0 CSL 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 to 89.25 mm (3.51 in). 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 3.0 CSL was given another, more substantial increase in displacement to 3, 153 cc (3.2 L; 192.4 cu in) by increasing the stroke to 84 mm (3.31 in), rated at 206 PS (203 hp; 152 kW) at 5600 rpm and 286 N⋅m (211 lb⋅ft) at 4200 rpm of torque This final version of the 3.0 CSL 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". The CSL competed in Group 2 form in the European Touring Car Championships
