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Fiat A.74


Fiat A.74 RIC38


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 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.


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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)
Compression ratio: 6.7:1
Power-to-weight ratio: 0.67 hp/lb



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