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Alfa Romeo 6C1750 Gran Sport 4a Serie

1930

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1923: Enzo Ferrari, at that time working at Alfa's race division, convinced Vittorio Jano (engineer with FIAT) to come over and join Alfa, where he developed the fabulous P2 race mechine and the 6C 1500, the production model that was derived from it.

The two were due to work together again in the 50's, but this is another story.

In 1929 the 6C 1500 was succeeded by the 6C 1750 GS with twin overhead camshaft and 85 bhp, the first with a classic open coachwork with two seats produced by Zagato. This model pre-eminently associated with the pre-war sporty Alfa cars.

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The 6C 1750 model, which was massproduced from 1929 to 1932 in the Turismo, Sport or Gran Turismo, Super Sport or Grand Sport (like the one here described), should be regarded as a considerable improvement over the previous 6C 1500 model.

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Alfa Romeo 6C 1750 Gran Sport spider 4th and 5th serie.

The 6C 1750 car was formally presented at the 2nd Rome Motor Show in January, 1929. The sport debut took place at the 3rd Mille Miglia in 1929, and it can be stated that the car dominated in all Sport Category races in terms of overall or class results until 1931. Overall and class successes were also obtained by customers in Italy as well as abroad thanks to the car's extreme handling ease.

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The 1750 GS engine and gearbox. The main difference between 4th (and following) series with the previous ones is on the engine, which adopted a warm-air device in the intakes via the exhaust gas. Moreover, for the Gran Sport tires were specced at 28 x 5,25 and final drive ratio at 12/51.

Although similar structural features and almost equal weight had been maintained, a considerable torque increase was obtained for the 6C 1750 engines, in addition to an increase in output resulting in better pick-up opportunities. In standard engines, autput was only increased by 10-15%, while for the enhanced racing engines over 100 HP (58 HP per liter) was obtained. Considerable improvements were also made on the chassis assembly in order to ensure maximum reliability in both standard types and special racing cars.

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The 1750 GS was available without or with lobe supercharger, delivering resp. 64 and 85 hp at 4500 rpm.

Price was at 53k Italian Lire for the n/a car and 59k for the supercharged one (roughly the equivalent of 55k€ in 2020 for the most expensive one ... quite a bang for the buck!).

The number of 1750 GS of 4th and 5th series produced was 213.