View source for Fiat A.74

{{short description|1930s Italian piston aircraft engine}}
{|{{Infobox Aircraft Begin
 |name= A.74 
 |image = File:Fiat A.74 RIC38.jpg
 |caption = Preserved Fiat A.74 R.I.C.38 engine
}}
{{Infobox Aircraft Engine
 |type= [[Radial engine]]
 |national origin = [[Kingdom of Italy]]
 |manufacturer= [[Fiat]] 
 |first run=  1937
 |major applications= [[Fiat CR.42 Falco]]<br>[[Fiat G.50 Freccia]]<br>[[Macchi C.200 Saetta]]
 |number built = 
 |developed from = 
 |developed into = [[Fiat A.80]]
 |variants with their own articles = 
}}
|}

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.

==Design and development==
The A.74 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&nbsp;hp to 1,400&nbsp;hp.

==Variants==
;A.74 R.C.18: With reduction gear and supercharger, rated altitude {{convert|1800|m|ft|abbr=on}}.
;A.74 R.C.38: With reduction gear and supercharger, rated altitude {{convert|3800|m|ft|abbr=on}}.
;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 {{convert|3800|m|ft|abbr=on}}.
;A.74 R.C.42: With reduction gear and supercharger, rated altitude {{convert|4200|m|ft|abbr=on}}.

==Applications==
*[[CANSA FC.20]]
*[[Fiat CR.42]]
*[[Fiat G.50]]
*[[Fiat RS.14]]
*[[Ikarus Orkan]]
*[[IMAM Ro.57]]
*[[Macchi C.200]]

==Specifications (A.74)==
{{pistonspecs
|<!-- If you do not understand how to use this template, please ask at [[Wikipedia talk:WikiProject Aircraft]] -->
<!-- Please include units where appropriate (main comes first, alt in parentheses). If data are missing, leave the parameter blank (do not delete it). For additional lines, end your alt units with </li> and start a new, fully formatted line with <li> -->
|ref=[http://issuu.com/icar2011/docs/fiat_a.74_mr_parte_1 A.74 engine manual]
|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)
|diameter=1,195 mm (47.05 in)
|height=
|weight=590 kg (1,246 lb)
|valvetrain=One intake and one sodium-cooled exhaust valve per cylinder
|supercharger=
|turbocharger=
|fuelsystem=1 [[Bendix-Stromberg pressure carburetor|Stromberg]] carburettor
|fueltype=87 octane
|oilsystem=
|coolingsystem=air-cooled
|power=870 [[Horsepower#CV and cv|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) <ref>[http://issuu.com/icar2011/docs/fiat_a.74_mr_parte_1 A.74 engine manual]</ref>
|specpower=
|compression=6.7:1
|fuelcon=
|specfuelcon=
|oilcon=
|power/weight=1.2 kW/kg (0.73 hp/lb)
}}

==See also==
{{aircontent
<!-- other related articles that have not already linked: -->
|see also=

<!-- designs which were developed into or from this aircraft: -->
|related=
* [[Fiat A.80]]
<!-- aircraft that are of similar role, era, and capability as this design: -->
|similar aircraft=

<!-- relevant lists that this aircraft appears in: -->
|lists=
*[[List of aircraft engines]]
<!-- For aircraft engine articles.  Engines that are of similar to this design: -->
|similar engines=
* [[Alfa Romeo 135]]
* [[BMW 801]]
* [[Bristol Hercules]]
* [[Gnome-Rhône 14N]]
* [[Mitsubishi Kinsei]]
* [[Nakajima Sakae]]
* [[Piaggio P.XI]]
* [[Piaggio P.XIX]]
* [[Pratt & Whitney R-1830 Twin Wasp]]
* [[Shvetsov ASh-82]]
* [[Tumansky M-88]]

<!-- See [[WP:Air/PC]] for more explanation of these fields. -->
}}

==References==
{{commons category}}
* [http://www.oldengine.org/members/diesel/Duxford/data01.htm oldengine.org] {{Webarchive|url=https://web.archive.org/web/20070314003852/http://www.oldengine.org/members/diesel/Duxford/data01.htm |date=2007-03-14 }}
<references />

{{Fiat aeroengines}}

[[Category:Aircraft air-cooled radial piston engines]]
[[Category:Fiat aircraft engines|A.74]]
[[Category:1930s aircraft piston engines]]