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. Englebert, who had supplied the Ferrari's tyres, and Enzo Ferrari himself were all charged with manslaughter by Italian prosecutors in an investigation that lasted until 1961, when both Ferrari and Englebert were cleared of charges.