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Dijon, 20 May 1984 - René Arnoux, 4th in the French Grand Prix.



Model

126 C4

Type


Formula 1 racing car.

Years of activity


1984.

First race


Brazilian Grand Prix of 25.3.1984.

Engine


Type 031. 6 cylinders in 120° V, rear-mounted. Light alloy cylinder block and heads, press-fitted aluminium cylinder liners. Water cooled.

Bore and stroke


81 x 48.4 mm.

Unitary and total capacity


249.4 / 1,496.43 cc.

Compression ratio


6.7:1.

Max. power output


In a race 660 bhp at 11,000 rpm. Max. pressure 3.2 bar.

Timing gear


4 valves per cylinder, 2 overhead cams per bank of cylinders. Gear drive at rear.

Fuel feed


2 KKK central upper turbos and Lucas-Ferrari or digital Weber-Marelli indirect injection plus Emulsistem.

Ignition


Single. Magneti Marelli electronic.

Lubrication


Forced. Dry sump.

Transmission


Rear. Multi-plate clutch. 633 gearbox with 5 speeds + reverse, transverse in block with self-locking differential.

Gear ratios


Variable depending on racing circuit.

Frame


Type 633. Monococque in Kevlar-carbon fibre composite.

Front suspension


Double wishbones: double overlapping triangles, pull-rod spring control.

Rear suspension


Double wishbones: upper trapezium, lower triangle, pull-rod spring control.

Steering


Rack and pinion.

Brakes


Ventilated cast iron discs, Brembo 4-piston cast aluminium callipers .

Tyres


Front 25.0-9.0-13, rear 26.0-15.0-13 - Goodyear.

Rims


Multi-piece. Front 12.5x13, rear 16.5x13.

Wheelbase


2,600 mm.

Front/rear track


1,768.4 mm / 1,680.2 mm.

Length


4,115 mm.

Width


2,125 mm.

Height


1,080 mm.

Weight with water and oil


540 kg.

Fuel tank (litres)


220. Mid-mounted. Fuel 102 octane RON.

Bodywork


Composite, only for side panelling of systems.