 TWR purchased the rights to the V64V engine from Austin Rover in 1989 and developed a completely new turbocharged engine, codenamed JV6, under the auspices of Allan Scott, with proportions roughly similar to the V64V, and suitable for Sportcar racing. TWR redesigned all parts of the engine, increasing the displacement to 3.5 litres, and adding two Garrett TO3 turbochargers. The JV6 engine would first be used in the JaguarSport XJR-10 and XJR-11 racing cars; its compact dimensions and low weight made it an ideal candidate for the XJ220. The engine had a 90°bank angle, four valves per cylinder and belt-driven double overhead camshafts. It shares a number of design features with the Cosworth DFV Formula One engine.
