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Ferrari 312 P
Competition sports car From Wikipedia, the free encyclopedia
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The Ferrari 312 P was a Group 6 Prototype used for racing in 1969 and 1970. It used a V12-engine derived from the F1 car Ferrari 312, detuned for endurance.
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When the F1 car was fitted with a flat-12 engine with lower center of gravity, called boxer and marked Ferrari 312B, also the new 1971 version of the sports prototype came with the boxer engine, thus the Ferrari 312 PB is the successor.
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History
After boycotting sports car racing in 1968 to protest a rule change that also banned their 4-litre 330 P4, Ferrari built a 3000cc prototype in 1969, the 312 P. It was hardly more than a 3-litre F1 Ferrari 312 with open Barchetta, and later the closed top Berlinetta.
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The first registered race was at the 12 Hours of Sebring in 1969. Ferrari (short on money) started only one 312 P (chassis no. 0868). Mario Andretti got pole position, and with Chris Amon, he managed to finish second. This raised hopes for a prospective Ferrari victory.[1] At the ensuing test weekend at Le Mans, a different car, chassis no. 0870, disappointed, and it was clear that better aerodynamics (with a closed coupe) were necessary. The 0870 also raced at the BOAC 500 in Brands Hatch, where Amon and Pedro Rodríguez finished fourth (behind three Porsche 908-01).[2] At 1000km Monza, Chris Amon took the pole with the 312 P spider, ahead of Jo Siffert's 908-01, but had to retire. The 312 P was not entered in the second Italian race, the Targa Florio, and had to retire in the German 1000 km Nürburgring. At the 1000 km Spa race, the 312 P of Rodriguez and David Piper was second behind the Siffert/Redman 908-01LH.[3] Two 312 Ps were entered in the 1969 24 Hours of Le Mans, now as low-drag Berlinettas. They were fifth and sixth on the grid, but didn't finish.
During the 1969 season, the appearance of the Porsche 917 had made clear that only a similar new prototype-like 5-litre "sports car" would be able to challenge it until the loop hole expires after 1971. Since mid-1969, Ferrari spent some of the millions earned in the Fiat deal for the construction of the required series of 25 new 5-litre V12 Group 5 sports cars which accordingly was called 512S.
At the end of the 1969 season the two remaining 312 Ps were sold to Luigi Chinetti's North American Racing Team, since the European branch of Ferrari racing would rely on the Ferrari 512S in 1970 - and only in 1970, abandoning it to focus on the 1971 Ferrari 312 PB that would be raced for three seasons. The 312 Ps returned to Europe for the 1970 24 Hours of Le Mans, where one of them was raced (as opposed to eleven 512s). The car was among the 16 cars still running at the end.
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Specifications
- Top speed: 320 km/h(198.8mph)
- Engine
- Type: rear, longitudinal V12 60°
- Bore/stroke: 78.5 x 51.5 mm
- Unitary displacement: 249.25 cc
- Total displacement: 2991.01 cc
- Compression ratio: 11,5:1
- Maximum power: 331 kW (450 hp) at 10.800 RPM[4]
- Power per litre: 150 hp/l
- Valve actuation: Twin overhead camshaft per bank, four valves per cylinder
- Fuel feed: Lucas indirect injection // Ignition = Single spark plug per cylinder, electronic
- Lubrication: Dry sump
- Clutch: Multi-plate
- Chassis
- Frame: tubular steel
- Front and rear suspension: Independent, unequal-length wishbones, coil springs, telescopic shock absorbers, anti-roll bar
- Brakes: Discs
- Transmission: 5-speed + reverse
- Steering: Rack-and-pinion
- Fuel tank: Capacity 117 litres[4]
- Front tyres: 9-22-13
- Rear tyres: 13-26-15
- Bodywork
- Type: Two-seater spider
- Length: 3500 mm
- Width: 1880 mm
- Height: 956 mm
- Wheelbase: 2220 mm
- Front track: 1425 mm
- Rear track: 1400 mm
- Weight: 585 kg (with liquids)[4]
References
External links
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