The Type 30 employed a lengthened version of the Type 23 “Brescia” frame, crowned by a 1,991-cubic centimeter engine fitted with a barrel-type crankcase beneath a pair of fixed-head cylinder blocks, surmounted by a single cambox, in which the overhead camshaft operated the valves by finger-type rockers to the two inlets and a single exhaust valve per cylinder. This engine went on to be used in the cut-cost Type 35A and Type 38. About 600 were built from late 1922 through 1926 in varying specifications. Carburetion was supplied by a pair of Zenith or Solex carburetors, whilst the ignition was initially by magneto; it was switched to a normal coil distributor on later cars. A fine four-speed gearbox with right-hand change lever and mesh gears, shifting through a wet multi-plate clutch, ensured the remarkably rapid gear change for which all Bugatti’s were renowned. The I-beam front axle was new and substantially constructed, and hydraulic front brakes were installed, with the rear drums considerably larger than those at the front.
About 600 were built from late 1922 through 1926 in varying specifications.