They used Cosworth V10 engines until 2006 . Two Formula One teams were supplied with Cosworth engines in 2006 : the Williams team using Cosworth V8 engines , transmissions , and associated electronics ; and the Scuderia Toro Rosso team using rev-limited Cosworth V10s based on 2005 spec engines . The end of the 2006 F1 season marked the end of Cosworth 's remarkable 43 year association with the series , as no team opted to use Cosworth for 2007 .