title: Kinner B-5
text: # Kinner B-5
  
  The Kinner B-5 was a popular five cylinder American radial engine for light general and sport aircraft of the 1930s.
  
  ## Design and development
  
  The B-5 was a development of the earlier K-5 with slightly greater power and dimensions. The main change was the increase in cylinder bore from 108 mm (4.25 in) to 117 mm (4.625 in) and a corresponding increase in displacement from 372 cu in (6.1 liters ) to 441 cu in (7.2 liters ). One difference the B-5 had from radial engines of other manufacturers was that each individual cylinder had its own camshaft, a system also used by the contemporary Soviet-built, 8.6 litre-displacement Shvetsov M-11 five cylinder radial, while most other radial engine designs used a "cam ring" for the same purpose, connected to every cylinder's valves. The B-5 was a rough running but reliable engine. The B-5 and its derivatives were produced in the thousands, powering many World War II trainer aircraft; its military designation was R-440. The B-5 was followed by the R-5 and R-55.
  
  ## Applications
  
  * Fleet Fawn
  * Fleet Finch
  * Kinner Sportster
  * Kinner Sportwing
  * Lincoln AP
  * Monocoupe 125
  * Redfern DH-2
  * Ryan PT-22 Recruit
  * Savoia-Marchetti S.56
  
  ## Specifications (Kinner B-5)
  
  Data from Jane's all the World's Aircraft 1938
  
  ### General characteristics
  
  * Type: Five-cylinder, air-cooled, radial
  * Bore: 4.625 in (117.5 mm)
  * Stroke: 5.25 in (133 mm)
  * Displacement: 441 cu in (7.23 L)
  * Length: 32.325 in (821.1 mm)
  * Diameter: 45.375 in (1,152.5 mm)
  * Dry weight: 295 lb (134 kg)
  
  ### Components
  
  * Valvetrain: 1 Inlet and 1 Exhaust valve per cylinder, individual camshafts for each cylinder
  * Fuel system: 1x Holley or Stromberg Carburetor
  * Fuel type: 73 Octane
  * Oil system: Circulating dry sump system
  * Cooling system: Air-cooled
  
  ### Performance
  
  * Power output: 125 hp (93 kW) at 1,925 rpm max; 89 hp (66 kW) at 1,725 rpm cruise
  * Compression ratio: 5.25:1
  * Specific fuel consumption: 0.60 lb/hp hr (0.365 kg/kw hr)
  * Oil consumption: 0.025 lb/hp hr (0.0152 kg/kw hr)
  * Power-to-weight ratio: 0.42 hp/lb at cruise
  