Fiat A.74

The Fiat A.74 was a two-row, fourteen-cylinder, air-cooled radial engine product 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.

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 840hp to 1,400hp.

pecifications (A.74)

pistonspecs

type=14 cylinder air cooled radial
bore=140 mm (5.512 in)
stroke=145 mm (5.709 in)
displacement=31,249.42 cc (1,906.96 cu in)
length=1,044mm (41.13 in)
diameter=

width=653mm (25.71 in)
height=1,195mm (47.05 in)
weight=565kg (1245.6 lb)
valvetrain=One intake and one sodium-cooled exhaust valve per cylinder
supercharger=
turbocharger=
fuelsystem=1 stromberg carb
fueltype=87 octane
oilsystem=
coolingsystem=air cooled
power=840hp @ 2,400RPM
specpower=
compression=6.70:1
fuelcon=
specfuelcon=
oilcon=
power/weight=1.48lb/hp @ cruise speed

Applications

;ITA:
*CANSA FC.20
*Fiat CR.42
*Fiat G.50
*Fiat RS.14
*Macchi MC.200

Comparable engines

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

References

* [http://www.oldengine.org/members/diesel/Duxford/data01.htm oldengine.org]