gear gear gear

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In the first half of the 1930s FIAT intensified the study of air-cooled radial engines, developing various new models. Presented in 1934, the A 70 showed a whole of various refined technical characteristics, not common in small and medium-sized engines of that time. The A 70 features compact size and high-level constructive quality, observable in very thin cooling fins over both cylinders and heads, and good mass-to-power ratio, also obtained thanks the supercharging system. Despite its excellent performance, improved in the more powerful A 70 S version in 1936, the engine gained no noticeable spread and its production was limited to a few units.

Technical specifications

ManufacturerFIAT, Torino, 1934
TypeA 70
Descriptionsingle-row 7-cylinder radial engine, crankcase, heads and pistons made of aluminium-alloy, streel-made cylinders screwed into the heads, hemispherical combustion chambers
Stroke115 mm
Bore115 mm
Displacement8.4 litres
Compression ratio5.75
Power205 CV a 2200 rpm
Specific fuel consumption250 g/CV/h
Specific power24.5 CV/litre
Valvetrain system2 overhead valves per cylinder, operated by pushrods and rocker arms
Fuel feeding systemwith one single-barrel gasoline FIAT carburetor, placed upstream of the compressor with air-fuel mixture preheating
Supercharging systemwith a single-stage centrifugal compressor, driven by the crankshaft by means of a spur gears drive
Ignition systemtwo spark plugs per cylinder fed by two independent magneto distributors
Cooling systemair-fed
Lubrication systemforced by gear pumps
Mass167 kg
Mass-to-power ratio0.81 kg/CV


FIAT G. 5 bis, Breda 42, Cantieri Caproni Bergamasca PS. 1, Nardi FN 305 D etc.

Testi e immagini di Giuseppe Genchi
Sito realizzato da Pasquale Pillitteri