The Aurelia used the first production V6 engine, a 60° design developed by Francesco de Virgilio. The engine was an all-alloy pushrod design with a single camshaft between the cylinder banks. During production, capacity grew from 1.8 L to 2.5 L. A hemispherical combustion chamber and in-line valves were used. A single Solex or Weber carburettor completed the engine. Some up rated models were fitted with twin carburettors. At the rear was an innovative transaxle with the gearbox, clutch, differential, and inboard-mounted drum brakes. The front suspension was a continuation of the sliding pillar design, with rear semi-trailing arms replaced by a de Dion tube in the Fourth series. The Aurelia was also the first car to be fitted with radial tires as standard equipment.