Le Castellet, 1 July 1973: Jacky Ickx, fifth in the French Grand Prix
312 B3 - 1973
Formula 1 racing car.
Years of activity
Spanish Grand Prix of 29.4.1973.
Type 001/11. Rear-mounted. 12 cylinders in 180° V, derived from 001/1. 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 / 2,991.801 cc.
Max. power output
485 bhp at 12,500 rpm.
4 valves per cylinder, 2 overhead camshafts per bank of cylinders, gear drive on rear of engine.
Lucas indirect injection.
Single. Magneti Marelli Dinoplex electronic capacitive discharge.
Pressurised. Dry sump.
Rear. Borg & Beck multi-plate clutch, 628 gearbox with 5 speeds + reverse, rear longitudinal with overhang, in block with self-locking differential.
Variable depending on racing circuit.
Type 628. Stress-bearing monococque in boxed aluminium sheet.
Double wishbones: double triangles, inboard spring/damper units and anti-roll bar.
Double wishbones: upper arm, lower trapezium, one upper strut and anti-roll bar.
Rack and pinion.
Lockheed discs and callipers. Inboard at rear. Separate hydraulic circuits, edjustable for the 2 axles.
Front 9.0-20.0-13î, rear 14.0-26.0-13î. Goodyear.
Cast light alloy: front 10x13î, rear 16x13î.
1,625 / 1,604 mm.
Weight with water and oil
230 litres. 2 side-mounted tanks (Petrol NO 98/100).
12 Volt Safa.
Aluminium single-seater body with composite elements.