The Info List - Fiat A.74

The Fiat
A.74 was a two-row, fourteen-cylinder, air-cooled radial engine produced in Italy in the 1930s as a powerplant for aircraft. It was used in some of Italy's most important aircraft of World War II.


1 Design and development 2 Variants 3 Applications 4 Specifications (A.74)

4.1 General characteristics 4.2 Components 4.3 Performance

5 See also 6 References

Design and development[edit] The A.74 was important in that it marked a transition for Fiat
from liquid-cooled inline engines, to large air-cooled radial engines. Fiat had made a number of smaller radial air engines over the years but the A.74 marked a major increase in power and size. The A.74 family was widely produced and spawned a number of related engines such as the A.76, A.80, and A.82. Each successive generation being larger and more powerful than the previous. The entire series grew from 14 cylinders to 18 cylinders with a power output of 870 hp to 1,400 hp. Variants[edit]

A.74 R.C.18 With reduction gear and supercharger, rated altitude 1,800 m (5,900 ft). A.74 R.C.38 With reduction gear and supercharger, rated altitude 3,800 m (12,500 ft). A.74 R.C.38D A.74 R.C.38S A.74 R.I.C.38 With reduction gear, fuel injection and supercharger, rated altitude 3,800 m (12,500 ft). A.74 R.C.42 With reduction gear and supercharger, rated altitude 4,200 m (13,800 ft).


CANSA FC.20 Fiat
CR.42 Fiat
G.50 Fiat
RS.14 Ikarus Orkan Macchi C.200

Specifications (A.74)[edit] Data from A.74 engine manual General characteristics

Type: 14-cylinder air-cooled radial Bore: 140 mm (5.512 in) Stroke: 145 mm (5.709 in) Displacement: 31.25 L (1,906.9 cu in) Length: 1,044mm (41.13 in) Width: 653mm (25.71 in) Height: 1,195 mm (47.05 in) Dry weight: 565 kg (1,246 lb)


Valvetrain: One intake and one sodium-cooled exhaust valve per cylinder Fuel system: 1 Stromberg carburettor Fuel type: 87 octane Cooling system: air-cooled


Power output: 870 cv (858 hp, 640 kW) at 2,520 rpm at sea level (take-off power); 960 cv (947 hp, 706 kW) at 2520 rpm at 3,000 m (Emergency power) [1] Compression ratio: 6.7:1 Power-to-weight ratio: 1.1 kW/kg (0.67 hp/lb)

See also[edit]

Comparable engines

BMW 801 Bristol Hercules Pratt & Whitney R-1830 Wright R-2600 Gnome-Rhône 14N Mitsubishi Kinsei Nakajima Sakae Shvetsov ASh-82

Related lists

List of aircraft engines


Wikimedia Commons has media related to Fiat


^ A.74 engine manual

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aircraft engines

Piston engines

A.10 A.12 A.14 A.15 A.18 A.20 A.22 A.24 A.25 A.30 A.50 A.53 A.54 A.55 A.58 A.59 A.60 A.70 A.74 A.76 A.78 A.80 A.82 AN.1 AS.2 AS.3 AS.5 AS.6 AS.8 SA8/75 S.55

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