Alfa Romeo P3 Tipo B 50007

Car producer : 

Alfa Romeo


P3 Tipo B 50007





Alfa Romeo technical director, Vittorio Jano, first produced a centreline single-seater for Grand Prix racing with his Tipo A Monoposto design of 1931. But that model proved a demanding beast, powered as it was by two parallel 6C-1750 6-cylinder inline engines, each one driving via a separate gearbox to a single rear wheel via an individual propeller shaft. The cars won the Coppa Acerbo road race at Pescara, but that was a long way from establishing Grand Prix domination, as Jano's smaller, lighter, more svelte – and single-engined – Tipo B replacement would achieve come 1932.


New regulations dropped the old insistence upon two-seat-wide bodywork for Grand Prix racing cars, and Jano was free to perfect his Tipo B as a true Monoposto, initially built as narrow as could be within the constraint of accommodating a full-size grown man and all normal mechanical assemblies within its chassis and body panelling. Jano developed a full-house Grand Prix racing version of his already very-successful, straight-8, twin-overhead-camshaft supercharged 8C-2300 engine. He retained the 65mm bore size of the 2300 unit but stretched the stroke dimension from 88mm to 100mm for a swept volume of 2,654cc. With around 10.6lbs per square inch boost, Alfa Romeo claimed 215bhp at 5,600rpm.


This engine drove via a gearbox mounted in unit with the engine, while the output end of the gearbox carried a differential mechanism from which a vee-drive splayed rearwards to an individual bevel box driving each rear wheel. The two rear hubs were linked by a lightweight axle tube, and the vee-drive system minimised un-sprung weight and removed the tendency a live-axle with centreline crown wheel-and-pinion has of lifting the inside rear-wheel while cornering under power. This improved tyre adhesion and traction, and proved most effective in service.

The Alfa Romeo P3, P3 monoposto or Tipo B was a classic Grand Prix car designed by Vittorio Jano, one of the Alfa Romeo 8C models. The P3 was first genuine single-seat Grand Prix racing car and Alfa Romeo's second monoposto after Tipo A monoposto (1931). It was based on the earlier successful Alfa Romeo P2. Taking lessons learned from that car, Jano went back to the drawing board to design a car that could last longer race distances.

The P3 was the first genuine single seater racing car, and was powered by a supercharged eight-cylinder engine. The car was very light for the period, weighing just over 1,500 lb (680 kg) despite using a cast iron engine block.

The P3 was introduced in June, halfway through the 1932 Grand Prix season in Europe, winning its first race at the hands of Tazio Nuvolari, and going on to win 6 races that year driven by both Nuvolari and Rudolf Caracciola, including all 3 major Grands Prix in Italy, France and Germany.

The 1933 Grand Prix season brought financial difficulties to Alfa Corse so the cars were simply locked away and Alfa attempted to rest on their laurels. Enzo Ferrari had to run his breakaway 'works' Alfa team as Scuderia Ferrari, using the older, less effective Alfa Monzas. Alfa procrastinated until August and missed the first 25 events, and only after much wrangling was the P3 finally handed over to Scuderia Ferrari. P3s then won six of the final 11 events of the season including the final 2 major Grands Prix in Italy and Spain.

The regulations for the 1934 Grand Prix season brought larger bodywork requirements, so to counteract this the engine was bored out to 2.9 litres. Louis Chiron won the French Grand Prix at Montlhery, whilst the German Silver Arrows dominated the other four rounds of the European Championship. However the P3s won 18 of all the 35 Grands Prix held throughout Europe.

By the 1935 Grand Prix season the P3 was hopelessly uncompetitive against the superior German cars in 6 rounds of the European Championship, but that didn't stop one final, legendary works victory. The P3 was bored out to 3.2 litres for Nuvolari for the 1935 German Grand Prix at the Nürburgring, in the heartland of the Mercedes and Auto-Union empire. In the race, Nuvolari punctured a tyre early on while leading, but after the pitstop he carved through the field until the last lap when Manfred von Brauchitsch, driving the far superior Mercedes Benz W25 suffered a puncture, leaving Nuvolari to win the race in front of 300,000 stunned Germans.

The P3's agility and versatility enabled it to win 16 of the 39 Grands Prix in 1935. The P3 had earned its place as a truly great racing car.

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