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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 horsepower versions are fully convertible to the higher rated versions.
Design and development
In all models of this family of engines the cylinder heads are of aluminum alloy, screwed and shrunk onto steel barrels. Spark plug inserts and intake valve seats are made from aluminum-bronze alloy, while the exhaust valve seats are steel. The engines all employ hydraulic tappets which operate in aluminum guides that are machined into the crankcase. The tappets are built from four parts, a cam follower body, cup, cylinder and piston and operate with clearances of Template:Convert to Template:Convert. The pushrods are steel and feature pressed-in ball ends.
Lubricating oil is delivered under pressure from the Template:Convert oil sump to the drive bearings and the crankpins though the crankshaft. The cylinder walls and pistons are spray lubricated. Normal operating oil pressure is 35 psi, with minimum idle oil pressure 10 psi.
- Template:Convert, Compression ratio 5.4:1, max rpm 1900, fuel consumption at cruise 3.8 US gph
- Template:Convert, Compression ratio 6.3:1, max rpm 2300, 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.
- Template:Convert, Compression ratio 6.3:1, max rpm 2600, fuel consumption at cruise 4.8 US gph. The exhaust valves have stellite faces and the connecting rods have a Template:Convert hole drilled in the rod cap to improve lubrication. The pistons have three rings and smaller piston pins.
- Template:Convert, Compression ratio 7.55:1, max rpm 2700, fuel consumption at cruise 5.2 US gph. The connecting rods have a Template:Convert hole drilled in the rod cap to improve lubrication. The pistons have five rings and smaller piston pins.
- Aeronca KCA, 50C, 50TC, S50C
- Luscombe 8
- Piper J-3
- Piper J-4
- Porterfield CP50
- Porterfield CP55
- Taylorcraft BC
- Taylorcraft BCS
- Aeronca S65C, S65CA
- Aeronca 65F, 65CA, New Chief
- Aeronca Champion
- Ercoupe 415C
- Interstate SIA Cadet
- Luscombe 8A
- Piper J-3
- Piper J-4A
- Porterfield CP65
- Rearwin Skyranger 165
- Taylorcraft BCS, BCS12, 65
- Tayorcraft BC, BC1265, BCT, DC, L2
- Taylorcraft Tandem
- Culver LCA
- Luscombe 8C, 8D
- Piper J-4E
- Piper J-5
- Porterfield 75C
- Rearwin Skyranger 175
- Stinson HW75
Specifications (O-170-3 or A-65-8)
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 1.9 Christy, Joe: Engines for Homebuilt Aircraft & Ultralights, pages 43-52. TAB Books, 1983. ISBN 0-8306-2347-7
- ↑ 2.0 2.1 Teledyne Continental Motors: Continental Aircraft Engine Operator's Manual, pages 4-5. Teledyne Continental Motors, FAA Approved December 1980. Continental Form No. X30012
- ↑ 3.00 3.01 3.02 3.03 3.04 3.05 3.06 3.07 3.08 3.09 3.10 3.11 3.12 3.13 3.14 3.15 3.16 3.17 3.18 3.19 3.20 3.21 3.22 3.23 3.24 3.25 3.26 Wooden props (2008). Fahlin Propellers. Retrieved on 2008-12-13.
- Donald, David (1995). American Warplanes of World War II. New York: Barnes & Noble Books. ISBN 0-7607-2274-9.
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It uses material from the Wikipedia article "Continental O-170".