Alfa Romeo P1
The Alfa Romeo P1 was Giuseppe Merosi’s attempt to build a purpose-designed Grand Prix racing car — Alfa Romeo’s first — and its failure ended Merosi’s career at Alfa and opened the door to Vittorio Jano. Originally designated the GPR (Gran Premio Romeo) at Nicola Romeo’s express request, the car was designed quickly in 1923 for a new 2-litre engine category introduced for the European Grand Prix at Monza in September of that year. Three cars were constructed. The P1 used a 2,000 cc straight-6 DOHC engine (bore 65 mm × stroke 100 mm) producing 95 bhp at 5,000 rpm — a respectable specification, but the car was naturally aspirated at a time when supercharging was becoming decisive, and Merosi had no experience with forced induction. Two cars were entered at Monza, for Antonio Ascari and Ugo Sivocci.
On 8 September 1923, during practice for the Italian GP at Monza, Ugo Sivocci — who had won the 1923 Targa Florio for Alfa Romeo earlier that year — crashed at what is now known as the Ascari bend. He was killed instantly. His car bore the number 17, considered unlucky in Italy; the number was subsequently banned from Italian racing cars. Crucially, Sivocci’s P1 did not carry the Quadrifoglio Verde — the four-leaf clover he had painted on his winning RLTF at the 1923 Targa Florio, which had by then become Alfa Romeo’s racing talisman. Many at the Alfa Romeo works took the symbol’s absence as deeply meaningful, and after Sivocci’s death the open side of the triangle framing the modern quadrifoglio emblem is sometimes said to represent his absence. Antonio Ascari and the entire Alfa team withdrew immediately from the Italian Grand Prix.
The P1 programme was cancelled. Nicola Romeo and the management concluded that Merosi’s design approach was insufficient for the new era of supercharged Grand Prix racing. Luigi Bazzi — Alfa Romeo’s chief test engineer, who had come from Fiat — recommended bringing in his former Fiat colleague Vittorio Jano. Enzo Ferrari, then working at Alfa’s Milan depot, helped facilitate the approach and the negotiation. Jano was hired in autumn 1923 and immediately began designing the Alfa Romeo P2 from scratch. As a transitional step, in early 1924 one surviving P1 engine was fitted with a Roots-type supercharger — among the first drawings made by Jano at Alfa Romeo (one dated 29 December 1923), demonstrating the precise competence that Merosi had lacked. The P1 was only retroactively named “P1” once the P2 existed. Its failure was the pivot on which all of Alfa Romeo’s subsequent racing greatness turned.
Connections
- Giuseppe Merosi — designed, 1923, source: wikipedia.org
- Ugo Sivocci — primary test driver; killed at Monza during P1 practice, 8 September 1923, source: wikipedia.org
- Antonio Ascari — second entered driver; withdrew after Sivocci’s death, source: wikipedia.org
- Alfa Romeo — manufactured_by; P1 programme abandoned 1923, source: wikipedia.org
- Vittorio Jano — hired as replacement after P1 failure, source: wikipedia.org
- Luigi Bazzi — recommended Jano after P1 proved insufficient, source: speedholics.com
- Enzo Ferrari — facilitated Jano recruitment, source: wikipedia.org
- Alfa Romeo P2 — direct successor; Jano’s design that fulfilled what P1 could not, source: wikipedia.org
- Quadrifoglio Verde — P1 did NOT carry the clover; Sivocci’s death on unadorned P1 reinforced the symbol’s significance, source: wikipedia.org