The Fiat A.70 was an air cooled radial engine with seven cylinders developed by the Italian engineering company Fiat Aviazione in the 1930s. The engine powered a number of Italian light competition and prototype aircraft.

The A.70 was developed by Fiat Aviazione, part of Fiat S.p.A., as one of a number of related small radial engines.^[1] It debuted at the Challenge International de Tourisme 1934, powering a number of the competitors.^[2] The engine had seven cylinders of square design, with a bore and stroke of 115 mm (4.5 in), arranged around a crankshaft in a single row.^[3] It was connected to the propeller by direct drive, often through a NACA cowling.^[4]

• Breda Ba.42^[5]
• Caproni PS.1^[4]
• Fiat G.5^[6]
• Nardi FN.305^[7]
• Nardi FN.310^[7]

Data from NACA Technical Memorandum No.760.^[3]

• Type: 7-cylinder, single row, air cooled radial engine
• Bore: 115 mm (4.5 in)
• Stroke: 115 mm (4.5 in)
• Displacement: 9.35 L (571 in³)
• Dry weight: 168 kg (370 lb)

• Valvetrain: Two valves per cylinder
• Fuel type: Gasoline
• Cooling system: Air-cooled
• Reduction gear: Direct drive

• Power output: 200 hp (149 kW) at 2,300 rpm (max); 180 hp (134 kW) at 2,100 rpm (rated)
• Compression ratio: 5.8:1
• Power-to-weight ratio: 0.81 kg (1.8 lb) per hp

Comparable engines

• Armstrong Siddeley Lynx
• Siemens-Halske Sh 14
• Warner Super Scarab

Related lists

• List of aircraft engines

• Bridgman, Leonard (1950). Jane's All the World's Aircraft 1950-1951. London: Sampson Low, Marston.
• Gunston, Bill (2006). World Encyclopedia of Aero Engines. Stroud: Sutton Publishing. ISBN 0-7509-4479-X.
• Schulz, R.; Pleines, W. (1934). NACA Technical Memorandum No.760: Technical Aspects of the 1934 International Touring Competition (Rundflug). Retrieved 17 November 2019.
• Thompson, Jonathan (1963). Italian Civil and Military Aircraft, 1930-1945. Los Angeles: Aero Publishers. ISBN 1-2584-4296-5.