Makes › Alfa Romeo › P1 · Factory competition · 1923 Ultra Rare
Alfa Romeo
P1
First Alfa Romeo GP car; withdrawn after Sivocci's fatal crash at Monza
Contents
01Overview
At a glance
- Built
- 3 Built
- Years
- 1923
- Engine
- Inline six
- Power
- 70.8 kW / 96.3 PSFactory: 95 hp · converted
- Top speed
- Not yet verified
- Body
- Not yet verified
- Designer
- Giuseppe Merosi
- In this archive
- Not yet verified
- Surviving
- Not yet verified
Sources and any conflicting figures are in the sections below.
Why it matters
The P1 was Alfa Romeo's first car designed specifically for Grand Prix racing and the last work of its first chief designer, Giuseppe Merosi. It never started a race: it was abandoned after the death of Ugo Sivocci in testing in 1923, and the P2 designed by Vittorio Jano took over.
How rare is it?
Six separate kinds of rarity – never combined into one number.
Each kind of rarity is rated separately and never combined.
02Production & history
Production
Every figure says what it counts.
| What is counted | Figure | Basis | Status |
|---|---|---|---|
| Total model productionP1 cars built ('One of the three built was destroyed in a practice run for the Italian Grand Prix') | 31 | Factory production | Independently researched |
Independent counts (e.g. engine and colour) are never combined into a calculated figure. Surviving examples are never presented as original production.
History
The car was built at the wish of Nicola Romeo for the new 2-litre category introduced at the Italian Grand Prix at Monza in September 1923. Merosi designed it in a few months and three cars were built. It was first called G.P.R. (Gran Premio Romeo) and renamed P1 once Jano's P2 arrived in 1924.
On 8 September 1923 Sivocci crashed fatally in a test drive at Monza and Alfa Romeo withdrew from the race. In 1924 one of the cars received a Roots compressor and became the P1 Compressore.
Variants
How each version differs from the standard P1.
No variants documented yet. Have a source? Contribute it.
03Specifications
Technical specifications
Engine
| Engine family | Not yet verified |
|---|---|
| Engine code | Not yet verified |
| Layout | Inline six2 Independently researched |
| Cylinders | 62 Independently researched |
| Displacement | Not yet verified |
| Bore | 65 mmFactory: 65 mm2 Independently researched |
| Stroke | 100 mmFactory: 100 mm2 Independently researched |
| Compression ratio | Not yet verified |
| Valvetrain | DOHC, 2 valves per cylinder2 Independently researched |
| Fuel system | Two vertical monobloc carburettors2 Independently researched |
| Induction | Naturally aspirated (1923); Roots compressor fitted to one car in 19242,3 Independently researched |
| Power | 70.8 kW / 96.3 PSFactory: 95 hp · converted2 Independently researched |
| Power at | 5,000 rpm2 Independently researched |
| Torque | Not yet verified |
Transmission & drivetrain
| Gearbox | Not yet verified |
|---|---|
| Gears | Not yet verified |
| Driven wheels | Not yet verified |
Chassis, body & dimensions
| Chassis | Not yet verified |
|---|---|
| Front suspension | Rigid axle, semi-elliptic leaf springs2 Independently researched |
| Rear suspension | Rigid axle, semi-elliptic leaf springs2 Independently researched |
| Brakes | Drum brakes on all four wheels2 Independently researched |
| Steering | Not yet verified |
| Body construction | Not yet verified |
| Wheelbase | Not yet verified |
| Length | Not yet verified |
| Width | Not yet verified |
| Height | Not yet verified |
| Front track | Not yet verified |
| Rear track | Not yet verified |
| Kerb weight | Not yet verified |
| Dry weight | Not yet verified |
Performance
| Maximum speed | Not yet verified |
|---|---|
| 0–100 km/h | Not yet verified |
| Fuel tank | Not yet verified |
“Not yet verified” means no source has been checked for that value yet. Nothing is estimated to fill a gap.
04Colours & options
Factory colours & interiors
Original paint and trim, with the number of cars in each where a source gives it.
Not yet documented. Have a source? Contribute it.
Factory options & codes
Codes are shown exactly as written by the manufacturer.
Not yet documented. Have a source? Contribute it.
05Individual cars
Chassis register
Every documented car, with its colours, history and where it is now. Open a row for the full record. Known chassis are not automatically authenticated originals.
Not yet documented. Have a source? Contribute it.
Competition history
Every race result of the individual cars, in date order. Click a chassis number to open its full record in the register.
Not yet documented. Have a source? Contribute it.
Auction & sale history
Documented public sales of the individual cars. Click a chassis number to open its full record in the register.
Not yet documented. Have a source? Contribute it.
See one in person
Museums where an example of this car can be seen.
No example is documented on public display yet. Have a source? Contribute it.
06Reference
Identification guide
How to tell an original from a replica or later conversion.
Being verified against factory or registry sources before it is published. Have a source? Contribute it.
Sources
Each number links to the exact facts it supports.
-
1
Heroic GP failures – Motor Sport, February 1997 Level C
- 3 P1 cars built ('One of the three built was destroyed in a practice run for the Italian Grand Prix')
-
2
Ugo Sivocci, a giant at Portello Level C SpeedHolics
- Straight-6 engine
- Bore x stroke 65 x 100 mm
- two overhead camshafts, two valves per cylinder
- two vertical monobloc carburettors
- naturally aspirated
- 95 HP at 5000 rpm
- rigid axles and semi-elliptical leaf springs
- drum brakes on the four wheels
-
3
Premio Romeo 1923 (P1) Level D soltanto-alfaromeo.nl · 2012-02-23
- Roots-compressor ... P1 Compressore 1924
Keep exploring
More from Alfa Romeo
-
Alfa Romeo · 1988
164 ProCar
1 Built
-
Alfa Romeo · 1941
8C 2900B "Balena"
1 Built
-
Alfa Romeo · 1938
8C 2900B Le Mans Berlinetta (Touring)
1 Built
-
Alfa Romeo · 1968
Carabo (Bertone)
1 Built
See all 212 cars by Alfa Romeo →
More from Italy
-
Auto Avio Costruzioni
815
Production not yet verified
-
Lancia · 1970–1973
Fulvia Coupé 1600 HF (second series)
3,690 Built
-
De Tomaso
Pantera Group 4 (1972)
8 Built
-
Pagani
Huayra Codalunga
5 Built
62 other makes from ItalyAbarthACM AutomobiliAres DesignATSAuto Avio CostruzioniAutobianchiAznomB EngineeringBandiniBertoneBizzarriniBrixia-ZüstCagivaCarrozzeria Touring SuperleggeraCeiranoChiribiriCisitaliaCizetaColoniCoviniDallaraDe TomasoDiattoF.I.A.L. LegnanoFerrariFervesFiatFissoreFlorentiaGhiaInnocentiIntermeccanicaIsoIsotta FraschiniItalaItaldesignLaffiteLamborghiniLanciaMaseratiAll makes →