Cosworth solidified its association with Ford in 1969, by developing a double overhead camshaft (DOHC) 16-valve inline four-cylinder engine for road use in the Ford Escort. As Keith Duckworth was busy designing and developing the DFV, the project was assigned to Mike Hall, who created the 1601 cc BDA on the Ford Kent engine block for homologation purposes. The camshafts were driven by a toothed belt developed for Fiat 124, hence the name BDA, literally meaning "Belt Drive, A type". It was designed for FIA Group 2 and Group 4 on either rallying or touring car racing purpose. The nominal homologation at 1601 cc capacity meant that BDA-engined cars competed in what was usually the top class (1600 cc and up) so were eligible for overall victories rather than class wins.