  Le Castellet, 1 July 1973: Jacky Ickx, fifth in the French Grand Prix |
 Model 312 B3 - 1973
Formula 1 racing car.
Years of activity 1973.
First race Spanish Grand Prix of 29.4.1973.
Engine 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.
Compression ratio 11.5:1.
Max. power output 485 bhp at 12,500 rpm.
Timing gear 4 valves per cylinder, 2 overhead camshafts per bank of cylinders, gear drive on rear of engine.
Fuel feed Lucas indirect injection.
Ignition Single. Magneti Marelli Dinoplex electronic capacitive discharge.
Lubrication Pressurised. Dry sump.
Transmission Rear. Borg & Beck multi-plate clutch, 628 gearbox with 5 speeds + reverse, rear longitudinal with overhang, in block with self-locking differential.
Gear ratios Variable depending on racing circuit.
Frame Type 628. Stress-bearing monococque in boxed aluminium sheet.
Front suspension Double wishbones: double triangles, inboard spring/damper units and anti-roll bar.
Rear suspension Double wishbones: upper arm, lower trapezium, one upper strut and anti-roll bar.
Steering Rack and pinion.
Brakes Lockheed discs and callipers. Inboard at rear. Separate hydraulic circuits, edjustable for the 2 axles.
Tyres Front 9.0-20.0-13î, rear 14.0-26.0-13î. Goodyear.
Rims Cast light alloy: front 10x13î, rear 16x13î.
Wheelbase 2,500 mm.
Front/rear track 1,625 / 1,604 mm.
Length 4,335 mm.
Width 2,056 mm.
Height 900 mm.
Weight with water and oil 603 kg.
Fuel tank 230 litres. 2 side-mounted tanks (Petrol NO 98/100).
Battery 12 Volt Safa.
Bodywork Aluminium single-seater body with composite elements.
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