The Type 39 was basically identical to the Type 35C except for its engine. This was modified to be smaller at 1.5 L (1493 cc/91 in³) with a shorter-stroked crankshaft. This brought stroke down from 88 mm to 66 mm, and a mix of regular and ball bearings were used. Ten examples were produced. An odd 1.1 L (1092 cc/66 in³) version was also created by reducing the bore of the engine to 51.3 mm.
[SIZE="1"]Source: wikipedia.org[/SIZE]