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      • The Continental R-670 (factory designation W670) was a seven-cylinder four-stroke radial aircraft engine produced by Continental displacing 668 cubic inches (11 litres) and a dry weight of 465 lb (211 kg). Horsepower varied from 210 to 240 at 2,200 rpm. The engine was the successor to Continental's first radial engine, the 170 hp Continental A-70. This engine was used on many aircraft in the 1930s and 1940s. The R-670 was widely used in the PT-17 Stearman primary training aircraft of the U.S. military.
      In addition to being used in aircraft, the R-670 was used in a number of light armored vehicles of World War II.


      Variants


      Data from: Jane's All the World's Aircraft 1938
      Variants of the W670 included:

      W670-K
      carburetor, 5.4:1 compression, 65 Octane, front exhausts and 225 hp (168 kW)
      W670-L
      carburetor, 5.4:1 compression, 73 Octane, rear exhausts and 225 hp (168 kW)
      W670-M
      carburetor, 6.1:1 compression, 80 Octane, front exhausts and 240 hp (179 kW)
      W670-N
      carburetor, 6.1:1 compression, 80 Octane, rear exhausts and 240 hp (179 kW)
      W670-K1
      fuel injection, 5.4:1 compression, 73 Octane, front exhausts and 230 hp (172 kW)
      W670-L1
      fuel injection, 5.4:1 compression, 73 Octane, rear exhausts and 230 hp (172 kW)
      W670-M1
      fuel injection, 6.1:1 compression, 80 Octane, front exhausts and 250 hp (186 kW)
      W670-N1
      fuel injection, 6.1:1 compression, 80 Octane, rear exhausts and 250 hp (186 kW)


      Applications




      = Aircraft

      =
      American Airmotive NA-75
      Boeing-Stearman Model 75 (PT-17, N2S)
      CallAir Model A
      Cessna 190
      Eagle Aircraft Eagle 220
      Fairchild PT-23
      Funk F-23
      G class blimp
      Grumman G-164 Ag Cat
      Kellett K-2A, K-4
      Morane-Saulnier MS.317
      Timm N2T Tutor
      Waco 240-A
      Waco Standard Cabin series (UEC, UIC, UKC, UKC-S, UKS, VKS)
      Waco Custom Cabin series (UOC, VQC)
      Waco A series (UBA, ULA)
      Waco F series (UBF, UMF, UPF)


      = Armored fighting vehicles

      =
      T2 Combat Car
      T4 Combat Car
      M1 Combat Car
      M2 Light Tank
      M3 Stuart
      Landing Vehicle Tracked (LVT-2, -4; LVT(A)-1, -2, -4, -5)


      Specifications (R-670-K)



      Data from Jane's 1938


      = General characteristics

      =
      Type: Seven cylinder air-cooled radial
      Bore: 5+1⁄8 in (130.2 mm)
      Stroke: 4+5⁄8 in (117.5 mm)
      Displacement: 668 cu in (10.95 L)
      Length: 34+3⁄16 in (868.4 mm)
      Diameter: 42+1⁄2 in (1,079.5 mm)
      Dry weight: 450 lb (204.1 kg)


      = Components

      =
      Valvetrain: 1 inlet and 1 exhaust valve per cylinder
      Fuel system: 1 Stromberg NA-R6 Carburetor
      Fuel type: 65 octane
      Oil system: Dry sump, one pressure pump, one scavenge pump, enclosed valve-train
      Cooling system: Air-cooled


      = Performance

      =
      Power output: 225 hp (168 kW) at 2,175 rpm
      Specific power: 0.337 hp/in3
      Compression ratio: 5.4:1
      Fuel consumption: 13 US Gal/hr (49 L/hr) at cruising rpm
      Specific fuel consumption: 0.54 lb/hp/hr (0.328 kg/kW/hr) - at rated rpm
      Oil consumption: 0.4 US Gal/hr (1.5 L/hr) at cruising rpm
      Power-to-weight ratio: 0.49 hp/lb at cruising rpm


      See also



      Comparable engines

      Jacobs R-755
      Lycoming R-680
      Related lists

      List of aircraft engines


      References




      = Notes

      =


      = Bibliography

      =


      External links



      https://web.archive.org/web/20070807212519/http://www.oldengine.org/members/diesel/Duxford/usaero1.htm

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