Alfa Romeo 110

Alfa Romeo 110
Alfa Romeo 110
Type	Piston aircraft engine
Manufacturer	Alfa Romeo
First run	1930s
Number built	~500

Last updated November 11, 2025

The Alfa Romeo 110 was an Italian four cylinder air-cooled inverted inline engine for aircraft use, mainly for trainers and light aircraft. The Alfa Romeo 110 was based on the de Havilland Gipsy Major, with approximately 500 units produced. Derivatives of the 110 include the -1, ter and Alfa Romeo 111^[1] (possibly a mis identification of the 110-1).

Variants

Alfa 110-1: 97 kW (130 hp) at 2,350 rpm
Alfa 110ter: 108 kW (145 hp) at 2,350 rpm
Alfa 111: 116 kW (155 hp)^[1]

Applications

Specifications (110-1)

Data fromJane's All The World's Aircraft 1938,^[2]Italian Civil and Military aircraft 1930–1945,^[1]and Aircraft Engines of the World 1945^[3]

General characteristics

Type: Four-cylinder inverted air-cooled inline engine
Bore: 118 mm (4.65 in)
Stroke: 140 mm (5.51 in)
Displacement: 6.125 L (373.8 cu in)
Length: 1,642 mm (64.6 in)
Width: 498 mm (19.6 in)
Height: 825 mm (32.5 in)
Dry weight: 136 kg (300 lb)
Frontal Area: 6.1 sq ft (0.6 m²)

Components

Valvetrain: Two valves per cylinder, operated by pushrods and rocker arms
Oil system: Dry sump with one pressure and three scavenge pumps, 276–310 kPa (40–45 psi)
- Oil consumption: 0.01095 kg/(kW h) (0.018 lb/(hp h))
Cooling system: Air-cooled
Starter: Eclipse inertia starter
Ignition: 2 x Marelli SA-4 magnetos

Performance

Power output:
- Maximum power: 97 kW (130 hp) at 2,350 rpm
- Normal: 89 kW (120 hp) at 2,100 rpm
- Cruising: 67 kW (90 hp) at 1,500 rpm
Compression ratio: 5.5:1
Specific fuel consumption: 0.32 kg/(kW h) (0.52 lb/(hp h)) (take-off)
Power-to-weight ratio: 0.71 kW/kg (0.43 hp/lb)

Notes

1 2 3 Thompson, Jonathan W. (1963). Italian Civil and Military aircraft 1930–1945. USA: Aero Publishers Inc. p. 295. ISBN 0-8168-6500-0. LCCN 63-17621.{{cite book}}: ISBN / Date incompatibility (help)
↑ Bridgman, Leonard, ed. (1938). Jane's All The World's Aircraft 1938. London: Sampson Low and Marston Co. Ltd. pp. 67d –68d.
↑ Wilkinson, Paul H. (1945). Aircraft engines of the World 1945 (2nd ed.). New York: Paul H. Wilkinson. pp. 282–283.

References

Bridgman, Leonard, ed. (1938). Jane's All The World's Aircraft 1938. London: Sampson Low and Marston Co. Ltd. pp. 67d –68d.
Gunston, Bill (1986). World Encyclopedia of Aero Engines. Wellingborough: Patrick Stephens. p. 9.

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[Thompson-1] 1 2 3 Thompson, Jonathan W. (1963). Italian Civil and Military aircraft 1930–1945. USA: Aero Publishers Inc. p. 295. ISBN 0-8168-6500-0. LCCN 63-17621.{{cite book}}: ISBN / Date incompatibility (help)

[JAWA38-2] Bridgman, Leonard, ed. (1938). Jane's All The World's Aircraft 1938. London: Sampson Low and Marston Co. Ltd. pp. 67d –68d.

[Wilkinson1946-3] Wilkinson, Paul H. (1945). Aircraft engines of the World 1945 (2nd ed.). New York: Paul H. Wilkinson. pp. 282–283.

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