  Mario Andretti, winner of the 1971 South African Grand Prix |
 Model 312 B2
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 8.6-20-13î, rear 13.5-24.0-15î. Firestone.
Rims Cast light alloy. Front 10x13î, rear 15x15î.
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.
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