This is a list of prototype vehicles created by Bugatti that never reached or were never intended for serial production.
The Type 45 racing car's U16 engine was made up of 2 parallel 8-cylinder banks, hence the 8 exhaust runners per side, and had two crankshafts.
Originally designed for private use by Ettore Bugatti as a factory runabout, popular demand from previous customers convinced him to build more examples.
Electric braking was integrated, and both hand- and foot-brakes operated on rear wheel drums.
The Type 64 was an Atlantic-style coupe produced in 1939 with papillon [French for "butterfly"] doors, designed by Jean Bugatti.
Production was begun on three cars, but only one body was finished before Jean Bugatti's death in 1939; a second was completed in 2012.
Much to the chagrin of Bugatti purists, the Type 73 used off-the-shelf hex fasteners rather than the custom-designed parts used in all previous cars.
The use of a de Dion tube rear suspension was also a novelty for the company, though it was in vogue at the time.
The Type 251 was entered in the 1956 French Grand Prix, driven by Maurice Trintignant,[7] but was not competitive and retired after 18 laps.