Mike Hall, former Cosworth Director and designer of the BDA engine gets together with John and reminisces over old times. Mike shouldered the entire design of the engine as Keith was pre-occupied with F1, this led to Cosworth's first engine to use belt drive to its camshafts. It was based around the Ford Kent cylinder block and combined with four valves per cylinder produced very good gas flow. This set the standard in the 70s which other manufactures took many years to match. The BHP per litre of the BDA is not far short of what can be achieved now with present day technology which is a credit to Mike Hall's design.