 Formula One World Champion Jack Brabham test drove the Mk 1 Dolphin at Riverside International Raceway
Because of the increasingly competitive Formula Junior market, Crosthwaite decided to design a Dolphin Mk 2 in 1961 (also called the Dolphin International).Twenty six were produced.It had a tuned 997cc Ford Anglia 105E engine sourced from Mike Costin of Cosworth in the UK.