 The JV6 engines used in the Jaguar racing cars were produced by Swiss engineer Max Heidegger , but delivering the number of engines required for the XJ220 program was considered beyond his capacity . TWR formed a division , TWR Road Engines , to manage the design , development , construction and testing of the engines for the production cars . The JV6 engine used in the XJ220 featured little commonality with the engines Heidegger built for use in the XJR racing cars , being specifically engineered to meet performance and in particular , the European emissions requirements , which the race engines didn 't have to meet . 
