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The Type 51 series succeeded the famous Type 35 as Bugatti's premier racing car for the 1930s. Unlike the dominant Type 35s of the prior decade, the Type 51 (and later Type 53, Type 54, and Type 59) were unable to compete with the government-supported German and Italian offerings.
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Type 51
The original Type 51 emerged in 1931. Its engine was a 160 hp (119 kW) twin overhead cam evolution of the supercharged 2.3 L (2262 cc/138 in³) single overhead cam straight-8 found in the Type 35B. A victory in the 1931 French Grand Prix was a rare case of success for the line. About 40 examples of the Type 51 and 51A were produced. The Type 51 is visually very similar to the Type 35. The obvious external differences of a Type 51 are: the supercharger blow-off outlet is lower the bonnet in the louvered section; one piece cast wheels instead of bolted on rims; twin fuel caps behind the driver and finally the magneto being off-set to the left on the dash. However many Type 35 cars have been fitted with later wheels, so that is not a reliable signal.
Type 54
Grand Prix car of 1931, fitted with a twin overhead-cam 4.9 liter engine delivering 300 hp (223 kW). Four or five were built. Chassis number 54201 was the first type 54 built and was the works car for Achille Varzi , factory number plate 4311-NV1
Type 59
The final Bugatti race car of the 1930s was the Type 59 of 1934. It used an enlarged 3.3 L (3257 cc/198 in³) version of the straight-eight Type 57's engine sitting in a modified Type 54 chassis. The engine was lowered for a better center of gravity, and the frame was lightened with a number of holes drilled in the chassis. The signature piano wire wheels used splines between the brake drum and rim, and relied on the radial spokes to handle cornering loads. 250 hp (186 kW) was on tap, and eight were made.