To comply with the 1.5 litre Grand Prix regulations, Bugatti built the Type 39 which was similar in specification to the larger Type 35C. Only the engine was modified to have a shorter stroke that was reduced by 22mm.
1925 Bugatti Type 39A | Image Courtesy of FavCars
The Type 39 was also available with a supercharger and known as the Type 39A. Some engines were produced with an smaller bore to produce 1092cc.
1925 Bugatti Type 39A | Image Courtesy of FavCars
Keyword: 1925 Bugatti Type 39A