page_title: Continental O-170
section_title: Variants
hierarchical_section_title: Continental O-170 / Variants
caption_attribution_description: English: A Continental A-50 on display at the Air Zoo at Kalamazoo/Battle Creek International Airport in Portage, Michigan (United States).
context_page_description: The Continental O-170 engine is the collective military designation for a family of small aircraft engines, known under the company designation of A50, A65, A75 and A80. The line was designed and built by Continental Motors commencing in the 1940s. It was employed as the powerplant for civil and military light aircraft.
  The horizontally opposed, four-cylinder engines in this family are all identical in appearance, bore, stroke, dry weight, and piston displacement. All feature a bottom-mounted updraft carburetor fuel delivery system. The higher power variants differ only in compression ratio and maximum allowable rpm, plus minor modifications. The lower power versions are fully convertible to the higher rated versions.
context_section_description: A50
  50 hp (37 kW), Compression ratio 5.4:1, max rpm 1,900, fuel consumption at cruise 3.8 US gph
  A50-1
  A50-2
  A50-3
  A50-4
  A50-5
  A50-6
  A50-7
  A65
  65 hp (48 kW), Compression ratio 6.3:1, max rpm 2,300, fuel consumption at cruise 4.4 US gph. The exhaust valves have stellite faces. The pistons have three rings, although some early production A65s had four piston rings.
  A65-1
  A65-2
  A65-3
  A65-4
  A65-5
  A65-6
  A65-7
  A65-8
  A65-8F
  A65-9:
  A65-12
  A75
  75 hp (56 kW), Compression ratio 6.3:1, max rpm 2,600, fuel consumption at cruise 4.8 US gph. The exhaust valves have stellite faces and the connecting rods have a 0.125 in (3 mm) hole drilled in the rod cap to improve lubrication. The pistons have three rings and smaller piston pins.
  A75-1
  A75-2
  A75-3
  A75-4
  A75-5
  A75-6
  A75-14
  A80
  80 hp (60 kW), Compression ratio 7.55:1, max rpm 2,700, fuel consumption at cruise 5.2 US gph. The connecting rods have a 0.125 in (3 mm) hole drilled in the rod cap to improve lubrication. The pistons have five rings and smaller piston pins.
  A80-1
  A80-2
  A80-3
  A80-4
  A80-5
  A80-6
  A80-8
  O-170
  Military designation for the A50, A65, A75, A80 family of engines.
  O-170-1
  O-170-3
  O-170-5
  O-170-7
caption: A50 on display at the Air Zoo
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