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The Alfa Romeo 115 series of engines closely follows the original de Havilland Gipsy Six engines in having 1-piece Elektron casting crankcases with cover plates, steel cylinders, finned for cooling, and detachable aluminium alloy cylinder heads. The 6-throw 1-piece counterbalanced crankshaft is carried in seven plain journal bearings and the propeller is driven directly by the crankshaft.
Manufacturer: Alfa Romeo
Developed: 1930s
Type: six-cylinder inverted air-cooled inline engine
Bore:
– 115: 118 mm (4.65 in)
– 116-1: 120 mm (4.72 in)
Stroke: 140 mm (5.51 in)
Displacement:
– 115: 9.187 liters (560.63 in³)
– 116-1: 9.5 liters (579.73 in³)
Length: 1,642 mm (64.65 in)
Width: 498 mm (19.61 in)
Height: 825 mm (32.48 in)
Dry weight:
– 115-1: 210 kg (462.97 lb)
– 115ter: 223 kg (491.63 lb)
Frontal Area: 0.35 m2 (3.8 sq ft)
Components:
– Valvetrain: Two valves per cylinder, sodium-cooled exhaust valves
– Fuel system: Two Mona-hobson AI48D downdraught carburettors with mixture control
– Fuel type: 73 octane
– Oil system: 275.8–310.3 kPa (40–45 psi), dry sump with one pressure and three scavenge pumps.
– Oil grade (viscosity): 20.5 cs (100 S.U. secs)
– Oil consumption: 0.01095 kg/kW/hr (0.018 lb/hp/hr)
– Cooling system: Air-cooled
– Reduction gear: Direct drive
– Starter: Hand starter
– Ignition: 2x Marelli magnetoes, 2x 14 mm (0.55 in) short reach spark plugs per cylinder.
Maximum Power output:
– 115-1: 152.87 kW (205 hp) at 2,350 rpm
– 115bis: 145.41 kW (195 hp)
– 115ter: 167.78 kW (225 hp) at 2,350 rpm with 100/130 Octane fuel
– 116-1: 164.05 kW (220 hp) at 2,360 rpm
Normal Power output:
– 115-1: 145.41 kW (195 hp) at 2,200 rpm
– 115ter: 160.33 kW (215 hp) at 2,100 rpm with 100/130 Octane fuel
– 116-1: 156.60 kW (210 hp) at 2,250 rpm
Cruising Power output:
– 115-1: 104.40 kW (140 hp) at 1,500 rpm
Compression ratio: 6.5:1
Specific fuel consumption: 0.322 kg/kW/hr (0.53 lb/hp/hr) (take-off)
Power-to-weight ratio: 0.727 kW/kg (0.4425 hp/lb)
Variants:
– 115-1 (115-I)
– 115bis (115-2 / 115-II)
– 115ter (115-3 / 115-III)
– 116-1 (116-I): The 115 bored out to 120 mm (4.72 in) developing 220 hp at 2,360 rpm, otherwise similar.
Applications:
|
– Ambrosini SAI.2S (115-1) – Ambrosini SAI.3 – Ambrosini S.7 (115ter) – Bestetti BN.1 (one prototype) – Breda Ba.75 (prototypes) – Breda Ba.79S – CANT Z.1012 (or 110) – Caproni Ca.164 – Caproni Ca.309 Ghibli (115bis) |
– Fiat G.46-1B (115bis) – Fiat G.46-3B (115bis) – Fiat G.46-4B (115bis) – Fiat G.46-A (115ter) – Fiat G.46-3A (115ter) – Fiat G.46-4A (115ter) – Nardi FN.305 – Nardi FN.315 – Saiman 200 |
Sources:
Bridgman, Leonard (ed.) (1938). Jane's All The World's Aircraft 1938. London: Sampson Low and Marston Co. Ltd.
Gunston, Bill (1986). World Encyclopedia of Aero Engines. Wellingborough: Patrick Stephens.
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