9 Days in Summer is a promotional documentary film made by Ford that tells the story of the development of the Ford-funded Cosworth DFV and Lotus 49, the title coming from the nine Formula One races the car took part in 1967, which are also extensively featured in the film.Synopsis
The film opens showing Cosworth designer Keith Duckworth silently working away at his drawing board, then cuts to footage of the 1967 Dutch Grand Prix, over which the credits are superimposed, incorporated into a series of stylised gauges and dials. Jim Clark is shown winning the engine's début race.