The two-seater Jaguar SS100 was powered by a 2.5-litre straight-six engine. The engine was based on a Standard Motor Company unit. It was greatly improved by consultant engineer Harry Weslake, who converted it from side to overhead valve operation. The engine produced 100 horsepower, which provided sporty performance for the Jaguar SS100’s lightweight body.
On the eve of the Birmingham International Motor Show 1988, Jaguar unveiled a stunning prototype sports car, codenamed XJ220. Its body style was boldly contemporary and distinctively Jaguar. The flowing lines were clearly reminiscent of the great Jaguar sports car designs of the past. The body consisted of a unitary frame, constructed in bonded aluminum to achieve high strength and lower weight. A steel roll cage was incorporated within the tub. The outer body panels were also made of aluminum.