 It was developed from the 1962 Lotus 20, with the major differences that it had disc brakes all round, a top link and the 'rubber donut' to the rear suspension and a dry sump engine that was canted over to lower the centre of gravity.Also notable is the smoother bodywork covering the engine, compared to the boxy design of the 20.The 22 is a single-seat race car primarily for the Formula Junior series and most had a Cosworth Mk.IV or Mk.XI engine with about .