D32 Racing Car (1921 - 1922)
In 1921 and 1922 D3 cars were modified for racing. They competed on the famous Berlin "Avus" racing circuit and in other ADAC events. The bore of the D32 was 0.5 mm less that that of the D3 and the stroke was the same. But while the D3 delivered just 24 HP the D32 produced 55 HP. How was this extra performance achieved?