 The fourth team to have a 3L car was Cooper, however, their engine was far from new.The team's first monocoque chassis, the Cooper T81 was fitted with what was in essence Maserati's 1950s engine, which had seen success in the Maserati 250F, bored out to the new capacity limit.BRM's new H16 engine was also slated to appear, but reliability problems resulted in Peter Arundell being forced to withdraw his Lotus-BRM prior to qualifying.