The Mini Cooper resulted from a collaboration between BMC and John Cooper, owner of the Cooper Car Company and a constructor of Formula One cars. Issigonis, the Mini's designer, was initially reluctant to develop a performance variant, but after Cooper appealed directly to BMC management, the two men developed the car together. The Austin Mini Cooper and Morris Mini Cooper debuted in September 1961.
The 848 cc engine from the standard Mini was given a longer stroke to produce 997 cc, raising power from 34 to 55 bhp. The car received a race-tuned engine, twin SU carburettors, a closer-ratio gearbox, and front disc brakes — unusual in a small car of the era. An initial production run of one thousand units was commissioned to meet Group 2 rally homologation requirements. The 997 cc engine was replaced by a shorter-stroke 998 cc unit in 1964.
A more powerful variant, the Cooper S, was released in 1963 with a 1071 cc engine featuring a nitrided steel crankshaft and stronger bottom end, along with larger servo-assisted disc brakes. Two additional Cooper S models were produced for circuit racing in the under-1,000 cc and under-1,300 cc classes, with 970 cc and 1,275 cc engines respectively. The smaller 970 cc version was discontinued in 1965 after only 963 units; the 1,275 cc Cooper S remained in production until 1971. From 1966, Cooper S models featured twin fuel tanks as standard.
The Mini Cooper and Cooper S achieved remarkable success in rallying. The performance versions won the Monte Carlo Rally in 1964, 1965, and 1967, cementing the Mini's reputation as a competition car capable of defeating far larger and more powerful machinery. In 1962, Rhodesian John Love became the first non-British driver to win the British Saloon Car Championship, doing so in a Mini Cooper.
Total sales of the original Cooper series: 64,000 Mark I Coopers with 997 cc or 998 cc engines; 19,000 Mark I Cooper S models across the 970 cc, 1,071 cc, and 1,275 cc variants; 16,000 Mark II Coopers; 6,300 Mark II Cooper S; and 1,570 Mark III Cooper S models. There were no Mark III standard Coopers.
Production was also licensed internationally. Innocenti assembled Mini Coopers in Milan from knock-down kits from 1966, and Spain's Authi was licensed to produce the Authi Mini Cooper 1300 from 1973.
The Cooper name was revived in 1990 as the RSP (Rover Special Products) edition before entering full production in late 1991. From 1992, fuel injection was fitted to meet emissions standards, and a multi-point injected engine followed in 1997. The revived Cooper remained in production alongside the standard Mini until the end of original Mini production in October 2000.
From 2001, BMW applied the Mini Cooper name to several models in its revived Mini marque. The Mini Hatch launched in 2001 carried the Cooper designation through four generations, with the fourth generation in 2024 officially adopting MINI Cooper as its primary model name rather than a trim level. The Cooper name was also applied to the Mini Clubman, Mini Countryman, Mini Paceman, Mini Coupe, Mini Roadster, and Mini Aceman under BMW ownership. These modern vehicles are mechanically unrelated to the original BMC Mini but retain the transverse four-cylinder, front-wheel-drive layout.
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