 Englebert started in Formula One at the 1950 Monaco Grand Prix, with French Simca-Gordini drivers Robert Manzon and Maurice Trintignant.During the 1957 Mille Miglia, driver Alfonso de Portago, his co-driver, and nine spectators were killed when de Portago's 4.0-litre Ferrari 335 S lost control after suffering a blown tyre.The Ferrari sailed over an embankment and into the air, where it crashed into the crowd.