In 1938, Continental introduced the A50, an improved version of their ground-breaking A40 of 1931. In early 1939, the A65 introduced refinements that allowed increased horsepower for the same displacement.
The military designation for the A65 was the O-170.

models

• A50: 50 hp ( kW) @ 1,900 rpm
• A65: 65 hp (48 kW) @ 2,300 rpm
• O-170-3: 65 hp (48 kW) @ 2,300 rpm

specifications

• 4-cylinder, horizontally-opposed, air-cooled piston engine
• Displacement: 171 cubic inches (2.8 litres)
• Bore x stroke: 3.875 x 3.625 inches
   

used by

• Erco 415 Ercoupe
• Luscombe Silvaire 8
• Piper J-3 Cub