Agusta GA.70

GA.70
Type	4-cylinder, air-cooled, horizontally opposed engine
National origin	Italy
Manufacturer	Agusta
First run	1955

The Agusta GA.70 was a 4-cylinder, air-cooled, horizontally opposed engine developed in Italy for light aircraft and helicopter use. The GA.70/V featured a bottom sump for vertical applications and was rated at 158 hp. It was produced in the 1950s and 1960s.

Variants

GA.70/0

Horizontal mounting for light aircraft.

GA.70/V

Vertical mounting for helicopters.

Applications

• Agusta A.103
• Bölkow Bo 103
• de Bernardi M.d.B. 02 Aeroscooter
• Phoenix Minor
• Phoenix Major

Specifications (GA.70)

Data from Jane's All the World's Aircraft 1962-63

General characteristics

• Type: 4-cylinder air-cooled horizontally opposed aircraft piston engine, (G.A.70/V - vertically mounted helicopter engine)
• Bore: 92 mm (3.62 in)
• Stroke: 86.5 mm (3.41 in)
• Displacement: 2.300 L (140.35 cu in)
• Length: 760 mm (29.92 in), (G.A.70/V - 470 mm (18.50 in))
• Width: 750 mm (29.53 in), (G.A.70/V - 540 mm (21.26 in))
• Height: 450 mm (17.72 in), (G.A.70/V - 470 mm (18.50 in))
• Dry weight: 80 kg (176 lb) dry
• Designer: M. Ginnini

Components

• Valvetrain: pushrod operated overhead valve, 2x inlet + 2x exhaust per cylinder
• Fuel system: Stromberg NAS 3 carburettor
• Fuel type: 80/87 octane
• Oil system: Pressure lubrication with a gear driven pump
• Cooling system: Air-cooled

Performance

• Power output: 53.69 kW (72 hp) at 3,100rpm, (G.A.70/V - 61.15 kW (82 hp) at 3,300rpm)
• Specific power: 23.352 kW/l (0.513 hp/cuin), (G.A.70/V - 26.6 kW/l (0.584 hp/cuin))
• Power-to-weight ratio: 0.671 kW/kg (0.408 hp/lb), (G.A.70/V - 0.765 kW/kg (0.465 hp/lb))

References

• Taylor, John W.R. FRHistS. ARAeS (1962). Jane's All the World's Aircraft 1962-63. London: Sampson, Low, Marston & Co Ltd.
• Erickson, Jack. Horizontally-Opposed Piston Aero Engines