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FIAT A 80 RC 41 Nembo
1935 - primi anni '40



The FIAT A 80 is a twin-row, radial aircraft engine with 18 cylinders, with a max. power of 1000 hp. Before the 1930’s FIAT mainly developed liquid-cooled aircraft engines so the FIAT A 74 and the FIAT A 80 have been the first high power air-cooled airplane engines produced by FIAT. These engines, produced in vaious versions, have been derived from a Pratt and Whitney model and have been then developed by FIAT with several original design improvements. Despite they have been produced in a large number up to the first part of the 1940’s, due to several reasons, only few specimen survived up to nowadays. These engines have been widely used for many Italian military aircrafts up to the 1940’s. The FIAT A 80 was also employed by the Japanese imperial army that used the FIAT B.R.20 bombers during the Second Sino-Japanese War (1937-1945). Before the war few exemples have been also used in some liner aircrafts.

Technical specifications

ManufacturerFIAT Aviazione, Turin, Italy, from 1935 up to early 1940s
TypeA 80 RC 41 Nembo
Descriptiontwin-row 18-cylinder radial engine, crankcase, heads and pistons made of aluminium-alloy, streel-made cylinders screwed into the heads, hemispherical combustion chambers, crankshaft composed of two parts connected by bolts
Stroke165 mm
Bore140 mm
Displacement45720 cm³
Compression ratio6.70
Power1000 hp (standard output) at 2100 rpm, at 4100 m with an absolute intake manifold pressure of 0.98 bar
Specific fuel consumption270 g/hp/h at maximum power; 220-230 g/hp/h at 6/10 of maximum power
Specific power21.9 CV/litre
Valvetrain system2 overhead valves per cylinder, operated by pushrods and rocker arms, with exhaust sodium-cooled valves
Fuel feeding systemwith one twin-barrel gasoline FIAT carburetor, placed upstream of the compressor and equipped with pressure limiter and air-fuel mixture preheating
Supercharging systemwith a single-stage centrifugal compressor, driven by the crankshaft by means of a spur gears drive with a speed ratio of 9.37:1, for a full-throttle height of 4100 m
Ignition systemtwo spark plugs per cylinder fed by two independent Marelli MF 18 magneto distributors
Cooling systemair-fed
Lubrication systemforced by gear pumps
Starting systemcompressed air type with a 12 litres tank at a max. pressure of 15 bar (sufficient for 2 starts) and a Garelli air compressor for re-charging
Diameter1335 mm
Length1620 mm
Weight725 kg
Mass-to-power ratio0.73 kg/hp
Propeller speed ratio0.625:1 by means of a Farman-type bevel gear epicyclic reducer


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Breda Ba.82 (bomber)

CANT Z.509 (seaplane postal and passenger transport)

Caproni Ca.135 (bomber)

Fiat B.R.20 Cicogna (bomber)

FIAT G.18 V (airliner)

Savoia-Marchetti SM79 Sparviero (bomber and torpedo bomber)

Savoia-Marchetti S.M.87 (seaplane airliner)

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Testi e immagini di Giuseppe Genchi
Sito realizzato da Pasquale Pillitteri