  Buenos Aires, 13 January 1974: Niki Lauda, second in the Argentinian Grand Prix |
 Model 312 B3 - 1974
Type Formula 1 racing car.
Years of activity 1974/1975.
First race Argentine Grand Prix of 13.1.1974.
Engine Type 001/12. 12 cylinders in 180° V, rear-mounted, light alloy cylinder block and heads, press-fitted wet cast iron cylinder liners, 112 mm connecting rod, water cooled.
Bore and stroke 80 x 49.6 mm.
Unitary and total capacity 249.317 / 2,991.801 cc.
Compression ratio 11.5:1.
Max. power output 490 bhp at 12,500 rpm.
Timing gear 4 valves per cylinder, 2 overhead cams per bank of cylinders, gear drive at rear of engine.
Fuel feed Lucas indirect injection.
Ignition Single. Magneti Marelli Dinoplex capacitive discharge electronic.
Lubrication Pressurised. Dry sump.
Transmission Rear. Borg & Beck multi-plate clutch. 627 gearbox with 5 speeds + reverse, positioned longitudinally with overhang, in block with self-locking differential.
Gear ratios Variable depending on racing circuit.
Frame Type 628/B. Stress-bearing body. Aluminium panels riveted to a steel tube structure.
Front suspension Double wishbones: double triangles, inboard spring-damper units, anti-roll bar.
Rear suspension Double wishbones: upper arm, lower trapezium, one upper strut and anti-roll bar.
Steering Rack and pinion.
Brakes Discs with Lockheed callipers. On wheels at front. Inboard at rear. Independent hydraulic circuits on the 2 axles.
Tyres Front 9.2/20.0/13î, rear 14.0/26.0/13î. Goodyear.
Rims Cast in light alloy. Front 10x13î, rear 18x13î.
Wheelbase 2,500 mm.
Front/rear track 1,606 mm / 1,604 mm.
Length 4,335 mm.
Width 2,056 mm.
Height 900 mm.
Weight with water and oil 582 kg.
Fuel tank (litres) 230. 2 side tanks. (Petrol: NO 98/100).
Battery 12 Volt ìSafaî.
Bodywork Aluminium single-seater body with composite components.
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