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Continental R-670 / W-670

 

 Cont-W670
Continental W-670

 

The Continental R-670 (factory designation W-670) was a seven cylinder four-cycle radial aircraft engine produced by Continental displacing 668 cubic inches (11 litres) and a dry weight of 465 lb (211 kg). First run in 1934, horsepower varied from 210 to 240 at 2,200 rpm. The engine was the successor to Continental's first radial engine, the 170hp 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 armoured vehicles of World War II.

 

Variants:

W-670-K
carburettor, 5.4:1 compression, 73 Octane, front exhausts and 225 hp (168 kW)

W-670-L
carburettor, 5.4:1 compression, 73 Octane, rear exhausts and 225 hp (168 kW)

W-670-M
carburettor, 6.1:1 compression, 80 Octane, front exhausts and 240 hp (179 kW)

W-670-N
carburettor, 6.1:1 compression, 80 Octane, rear exhausts and 240 hp (179 kW)

W-670-K1
fuel injection, 5.4:1 compression, 73 Octane, front exhausts and 230 hp (172 kW)

W-670-L1
fuel injection, 5.4:1 compression, 73 Octane, rear exhausts and 230 hp (172 kW)

W-670-M1
fuel injection, 6.1:1 compression, 80 Octane, front exhausts and 250 hp (186 kW)

W-670-N1
fuel injection, 6.1:1 compression, 80 Octane, rear exhausts and 250 hp (186 kW)

W670-6A (military R-670-5)
W670-6N (military R670-4, -11A)
W670-17 (military R-680-8)

 

Applications:
American Airmotive NA-75
Boeing Stearman
CallAir Model A
Cessna 190
Fairchild PT-23
G class blimp
M1 Combat Car
M2 Light Tank
M3 Stuart
LVT-4 Water Buffalo
Timm N2T Tutor
Waco 240-A
Waco UEC and UIC
Waco VKS-7
Waco QCF-2

 

Specifications:

R-670-K
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 kg (992.1 lb)
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, encoesed valve-train
Cooling system: Air-cooled
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

 

 


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