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Ferrari 312PB

Ferrari 312P
Category Sports car prototype
Constructor Scuderia Ferrari
Designer Mauro Forghieri
Team Scuderia Ferrari
Drivers 22px-Flag of Sweden.png Ronnie Peterson
22px-Flag of Belgium (civil).png Jacky Ickx
20px-Flag of Switzerland.png Clay Regazzoni
22px-Flag of the United Kingdom.png Brian Redman
22px-Flag of the United States.png Mario Andretti
3dflagsdotcom italy2bs.gif Arturo Merzario
3dflagsdotcom italy2bs.gif Sandro Munari
22px-Flag of Australia.png Tim Schenken
Chassis Aluminium central monocoque with steel spaceframe front and rear.
Front suspension Double wishbone, outboard coil spring/damper.
Rear suspension Single top-link, reversed lower wishbone, twin radius arms, outboard spring/damper.
Engine name Ferrari
Capacity 2991 cc
Configuration dohc flat-12,
Turbo/NA naturally aspirated
Engine position mid-mounted
Gearbox name Ferrari
Gears 5-speed
Type manual
Differential
Fuel Shell
Tyres Firestone/Goodyear
Debut 1971 1000 km Buenos Aires
Races
Wins
Cons champ 1 (1972 WSC)
Drivers champ
Poles
Fastest laps

This article is about the sportscar raced from 1971-1973. For the ealier 1969 car, see Ferrari 312P.


The Ferrari 312PB was a sportcar prototype racing car of the early 1970s. It was officially designated the 312P, but often known as the 312PB to avoid confusion with a previous car of the same name. It was part of the Ferrari P series of sports prototypes.

In 1970, a change in the regulations for sportscar racing for 1972 was announced. The loophole for the big 5L sports cars (such as the Porsche 917 and Ferrari 512) was closed, and the minimum weight of the 3L prototypes was raised to 650kg.

Porsche considered this too heavy as their Porsche 908/03 were 100kg lighter, and this advantage would have been lost. On the other hand, their aircooled two-valve engine was low on power with 370hp, and the development of a new engine would have been necessary. Thus, Porsche did not enter world championship sports car races after 1971 and sold the 908s to customers who would have to add weight to them. Matra and Alfa Romeo were willing and able to compete, but only in selected seasons or events. Also, Ford's successful Formula 1 Cosworth-V8 engine was available for independent chassis builders, but vibrations made it unreliable for endurance racing.

After having been beaten by the Porsche 917 in 1970, Ferrari abandoned further development of the Ferrari 512M, leaving the 512 to customer teams like Penske Racing, which had some success with their improved 512M in 1971, though. Penske, probably not very happy about the lack of support from the factory, joined Porsche for their Can-Am effort with the turbocharged Porsche 917/10.

Carlos Pace driving a 312PB at the Nürburgring in 1973.

Instead, in 1971, Ferrari focused on a new 3.0L prototype based on the 180° flat-12 boxer from the 312B F1 car. Officially this design was known as 312P, the motorsports press appending the B to avoid confusion with the earlier 312P V12 cars. This design was similar to the traditional Porsche engine layout with its low center of gravity, but Ferrari used water-cooling and 4-valve heads. The car was promising, but did not win, while the similar Alfa Romeo 33 scored two wins against Porsche's dominance.

In 1972, with only Alfa answering the challenge, the 312PB was very successful and won all World Sportscar Championship races in which it was entered. Ferrari skipped the 1972 24 Hours of Le Mans, though, as the F1-based engine would not last 24 hours and surely spoil their otherwise perfect record.

In 1973, Matra which had previously focused on Le Mans also challenged for the championship while Alfa was absent. As Matra won several races, Ferrari needed to enter in the 1973 24 Hours of Le Mans, with an improved yet still doubtful engine. One car was used as a "hare" which supposed to lure the Matras into driving faster laps than they intended, to test their reliability. Ironically it was only the "hare" Ferrari which survived the 24 hours, finishing a respectable second behind a Matra. The championship saw the same order, with only two Italian wins compared to five French. In addition, despite the absence of the Matras, the 312PB could not defend the 1972 win of the Targa Florio as the prototypes of Ferrari and Alfas failed and a Porsche 911 collected a surprise win.

At the end of the 1973 season, Ferrari abandoned sports car racing to focus on F1 again, as the F1 team had even skipped GP races in 1973 due to lack of competitiveness.