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Mario Andretti, winner of the 1971 South African Grand Prix



Model

312 B2


Type


Formula 1 racing car.

Years of activity


1971/1972/1973.

First race


Brands Hatch Champions Race of 21.3.1971.

Engine


Type 001/1. 12 cylinders in 180° V derived from the 001, light alloy cylinder block and head, press-fitted aluminium wet cylinder liners, 112 mm connecting rod, water cooled.

Bore and stroke


80 x 49.6 mm.

Unitary and total capacity


249.317 / 2,991.802 cc.

Compression ratio


11.5:1.

Max. power output


470 bhp at 12,600 rpm.

Timing gear


4 valves per cylinder, 2 overhead camshafts per bank of cylinders, rear geared drive.

Fuel feed


Lucas indirect injection.

Ignition


Single. Marelli Dinoplex electronic capacitive discharge with coil ignition unit.

Lubrication


Pressurised with radiator. Dry sump.

Transmission


Rear. Borg & Beck multi-plate clutch. 621 gearbox with 5 speeds + reverse, rear longitudinal overhanging gearbox . Multi-plate self-locking differential.

Gear ratios


Variable depending on racing circuit.

Frame


Type 621/A. Stress-bearing body, aluminium panels riveted on a steel tube structure. Partially stress-bearing engine.

Front suspension


Double wishbones: upper rocker arm, lower triangle, inboard spring/damper units and anti-roll bar.

Rear suspension


Double wishbones: double triangles, one upper strut, horizontal spring/damper units above the differential.

Steering


Rack and pinion.

Brakes


Lockheed discs and callipers. Rear inboard. Separate adjustable hydraulic circuits on the two axles.

Tyres


Front 8.6-20-13, rear 13.5-24.0-15. Firestone.

Rims


Cast light alloy. Front 10x13, rear 15x15.

Wheelbase


2,378 mm.

Front/rear track


1,482 / 1,475 mm.

Length


4,020 mm.

Width


742 mm.

Height


956 mm.

Weight with water and oil


558 kg.

Fuel tank


233 litres. Side mounted in canvas/Pirelli rubber.

Battery


12 Volt Safa.

Bodywork


Aluminium single-seater body with composite elements.