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Le Castellet, 1 July 1973: Jacky Ickx, fifth in the French Grand Prix



Model

312 B3 - 1973


Type


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 9.0-20.0-13, rear 14.0-26.0-13. Goodyear.

Rims


Cast light alloy: front 10x13, rear 16x13.

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.