In 1929, the Phantom II was unveiled as the successor to the New Phantom, which is now known as the Phantom I in retrospect. Deliveries of the Phantom II commenced in September of the same year. In contrast to its predecessor, which inherited its foundation from the earlier 40/50hp Silver Ghost model, the Phantom II featured an entirely redesigned chassis inspired by the smaller 20hp Rolls-Royce. This new, sleeker frame, available in two wheelbase lengths of 144″ and 150″, had a low-slung profile with the radiator positioned further back. This innovation allowed coachbuilders to create modern and streamlined designs, departing from the upright styles of the past.
The engine of the Phantom II also underwent extensive revisions. While maintaining the same cylinder dimensions and basic layout as the Phantom I, with two blocks of three cylinders and a common aluminum cylinder head, significant changes were made to enhance performance. The combustion chambers were redesigned, and the cylinder head was transformed into a cross-flow design, placing the inlet and exhaust manifolds on opposite sides. The dual ignition system using both a magneto and coil, as seen in the Phantom I, remained unchanged. These modifications resulted in significantly improved performance, especially for the Continental model, and allowed for the accommodation of heavier coachwork.