Alfa Romeo 12C

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Alfa Romeo 12C
Car Musee Enzo Ferrari 0045.JPG
An Alfa Romeo 12C-36
Overview
Manufacturer Alfa Romeo
Production1936-1937
Designer Vittorio Jano
Body and chassis
Class Grand Prix 750 kg
Layout FR layout
Powertrain
Engine Roots supercharged 4.1 L 4064 cc 60° V12
370 bhp at 5800 rpm (12C-36) [1]
Roots supercharged 4.5 L 4475 cc 60° V12
430 bhp at 5800 rpm (12C-37)
Transmission 4-speed manual transmission
Dimensions
Curb weight 818 kg (1804 lb) (12C-36)
808 kg (1782 lb) (12C-37)
Chronology
Predecessor Alfa Romeo 8C-35
Successor Alfa Romeo Tipo 308
Alfa Romeo Tipo 312
Alfa Romeo Tipo 316

The Alfa Romeo 12C or Tipo C was a 12-cylinder Grand Prix car. The 12C-36 made its debut in Tripoli Grand Prix 1936, and the 12C-37 in Coppa Acerbo 1937. The 12C-36 was a Tipo C fitted with the new V12 instead of the 3.8 litre straight-eight of the 8C-35. The 12C-37 was a new car, with a lower chassis and an engine bored and stroked to 4475 cc, now with roller- instead of plain bearings and two smaller superchargers instead of a single large one. The car suffered poor handling, which could not be cured in time for the 1937 Italian GP, and thus was not successful. This is given as the reason for Vittorio Jano's resignation from Alfa Romeo at the end of 1937. [2] The 12C-36 used the existing six Tipo C chassis. Four examples of the 12C-37 were built, although only two were actually assembled for the 1937 Coppa Acerbo and Italian GP. Early in 1938, the Tipo C (8C-35, 12C-36) chassis were modified into 308s, with the straight-eight engine fitted lower in the chassis and a completely new body. The four 12C-37 chassis were instead assembled into 312 (V12 downsized to 3-litre) and 316 (V16 obtained from two 158 engines fitted to a common crankcase) formula race cars.

Contents

Main victories

Alfa Romeo 12C-37 Alfa Romeo 159 Goodwood.jpg
Alfa Romeo 12C-37

*All with 12C-36

Technical Information

The table below lists the main differences and similarities between the two versions.

Alfa Romeo 12C-36 Alfa Romeo 12C-37
engine 12 cylinder V 60º engine
displacement 4064 cc / 248 cu in 4495 cm³ / 274.3 cu in
bore × stroke 70mm × 88mm 72mm × 92mm
compression ratio 7.1 : 1 7.3 : 1
Power at 1/min 370 hp (276 kW) at 5800 430 hp (321 kW) at 5800
valve control two overhead camshaftn / 2 valves per cylinder
mixture preparation 2 Weber-50-DCO Carburetor, Roots blower 2 Weber carburetors, dual Roots blower
cooling Water
transmission 4 speed transmission, not synchronized (rear wheel drive)
brakes Hydraulic drum braken on all wheels
Front suspension Crank axle, coil springs,
hydraulic shock absorbers
Cross arms, coil springs,
hydraulic dampers
rear suspension pendulum axle, transverse leaf spring,
friction and hydraulic dampers
pendulum axle, semi-elliptical transverse leaf springs,
hydraulic telescopic dampers, friction dampers
body and frame Aluminum body on ladder frame
Wheelbase 2750mm 2800mm
Track width front / rear 1350mm / 1350mm 1370mm / 1430mm
front tire size 6.5 × 18
Rear tire size 6.5 × 19
Dimensions L × W × H 4200mm × 1520mm × 1215mm 4240mm × k. A × 1130 mm
curb weight (without driver) 820 kg 810 kg
tank capacity 170 l
fuel consumption
top speed 290 km/h (180 mph) 310 km/h (193 mph)

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References

  1. Borgeson, Griffith (1990). The Alfa Romeo Tradition. ISBN   0-85429-875-4.
  2. "CARS (PART 1) ALFA ROMEO". kolumbus.fi/leif.snellman. Archived from the original on 19 April 2007. Retrieved 2007-04-26.