Unable to make a deal with another major engine manufacturer, Williams used naturally aspirated Judd engines for the season. This left them with a significant performance deficit compared with their turbo-powered rivals. Piquet left Williams to join Lotus who had retained their Honda engines for the 1988 season, helped by having Satoru Nakajima as number 2 driver to Piquet. Williams brought in Italian Riccardo Patrese to replace Piquet. The team did not win a race that season and finished seventh in the Constructors' Championship, scoring 20 points. The highlights of the season were two second-places by Mansell, at the British and Spanish . When Mansell was forced to miss two races due to illness, he was replaced by Martin Brundle and then Jean-Louis Schlesser.