In 2010 Cosworth returned as the engine supplier for Williams. They also supplied three new teams; Hispania Racing, Lotus Racing and Virgin Racing. The CA2010 is the same 2.4 litre V8 base of the CA2006 used by Williams. It has been re-tuned from 20,000 rpm to the current 18,000 rpm limit required on all engines. The first engines were shipped to teams in mid-January, 2 weeks prior to first track testing for the year.