Jaguar XJ13

The Jaguar XJ13 was a prototype racing car developed by engineering director William Heynes to compete at Le Mans in the mid 1960s. It never raced and only one was built. Its mid-mounted 5.0 litre quad-cam V12, which produced 502 horsepower at 7600 rpm, drove the rear wheels through a five-speed ZF transaxle and served as a stressed chassis member. The aluminium body was shaped by aerodynamicist Malcolm Sayer, who had worked on the C-Type and D-Type, using techniques borrowed from the aircraft industry. Work began in 1965 and the car was running by March 1966, with David Hobbs as its main test driver. By the time it was ready, prototype engines were being limited to three litres, and the project never became a company priority.