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 Model 553 F1 - 554 F1
Formula 1 racing car.
Years of activity 1954/1955.
First race Siracusa Grand Prix of 11.4.1954.
Engine Type 106. 4 cylinders in line, aspirated, front-mounted, light alloy cylinder block and head, 138 mm connecting rod, steel cylinder liners, water cooled.
Bore and stroke 100 x 79.5 mm.
Unitary and total capacity 624.39 / 2,497.56 cc.
Compression ratio 13:1.
Max. power output 260 bhp at 7,200 rpm.
Timing gear 2 valves per cylinder, 2 overhead camshafts with tappets and rollers, gear drive at front.
Fuel feed 2 horizontal Weber 50 DCOA-3 twin-choke carburettors.
Ignition Double with 2 Marelli magnetos.
Lubrication Forced with dry sump.
Transmission Rear. Multi-plate clutch, gearbox with 4 speeds + reverse, in block with self-locking differential.
Gear ratios Variable depending on racing circuit.
Frame Type 553. Steel tube frame.
Front suspension Double wishbones: double triangles, transverse lower leaf spring, anti-roll bar and Houdaille hydraulic lever dampers.
Rear suspension De Dion live axle, two longitudinal struts, transverse lower leaf spring and Houdaille hydraulic lever damper.
Steering Worm and sector.
Brakes Finned bimetallic drums with independent hydraulic control for front and rear wheels.
Tyres Front 5.25/5.50x16", rear 7.00x16".
Rims Spoked, front 3.50/4.00x16", rear 5.50x16".
Wheelbase 2,160 mm.
Front/rear track 1,278 mm / 1,250 mm.
Length 3,988 mm.
Width 1,427 mm.
Height 1,020 mm.
Weight with water and oil 590 kg.
Fuel tank (litres) N. a. Mixture. 2 side tanks.
Bodywork Aluminium single-seater body with 2 side fuel tanks.
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