CNA C.II

The CNA C.II was a small, air-cooled, two cylinder horizontally opposed aircraft engine designed and built in Italy in the late 1930s.

C.II
Type	Horizontally opposed air-cooled twin
National origin	Italy
Manufacturer	Compagnia Nazionale Aeronautica (CNA)
Produced	1937-41

Design

The low power, unsupercharged C.II had offset cylinders with special steel barrels and light alloy cylinder heads. The pistons were light alloy castings; the connecting rods were heat treated chrome-nickel steel, with split big ends. The CN.II had a one piece chrome-nickel steel crankshaft running in two roller bearings, with a ball thrust bearing. The crankcase was a one piece light alloy casting.^[1]

Applications

Data from Erickson^[2]

• Alaparma AM-8
• Alaparma AM-9
• Alaparma AM-10
• Partenavia P.53 Aeroscooter

Specifications

Data from Jane's All the World's Aircraft 1938^[1]

General characteristics

• Bore: 90 mm (3.54 in)
• Stroke: 110 mm (4.33 in)
• Displacement: 1.4 L (85.4 cu in)
• Length: 478 mm (18.81 in)
• Width: 856 mm (33.70 in)
• Height: 526 mm (20.71 in)
• Dry weight: dry 42 kg (92.6 lb)

Components

• Valvetrain: Large diameter overhead valves, one inlet and one exhaust per cylinder. Enclosed rocker gear operated by push-rods driven off upper crankcase camshaft.
• Oil system: Wet sump; crankshaft fed pressurised oil by pump.
• Cooling system: Air

Performance

• Power output: rated 28 kW (38 hp) at 2,700 rpm at sea level