The Continental R-670 (factory designation W-670) was an air-cooled, seven-cylinder radial engine. This model was a successor to the first radial engine presented in 1929 by Continental, the A-70 with a displacement of 8.91 liters and developing 170 hp. Main production of the company in 1944-1945, this thruster could, with some minor adaptations, be mounted either on training aircraft, or on light tanks (U.S. Army) and also on amphibious vehicles ( LVT, Landing Vehicle Tracked) employed by the U.S. Navy. This reliable and versatile engine was widely manufactured (about 40,000 copies?).
The R-670 had a displacement of 10.94 liters The bore was 11.75 cm, for a stroke of 13.02 cm. The dry weight reached about 210 kg. The dimensions were, a diameter of 1.079 m, for a length of 86.84 cm. The power developed ranged from 210 to 240 hp. A Model K delivered 225 bhp at 2,175 rpm, a Model M delivered 240 bhp at 2,200 rpm. The fuel consumption was for these two types, in cruise mode, 49/57 liters per hour, that of oil 1.5 liters per hour.
The aluminum pistons were forged with heat treatment. They carried four segments (three of compression and a scraper, the third). The engine cases were made of two aluminum alloy castings. The timing comprised two valves per cylinder, actuated by tappets and rocker arms. The exhaust valves were made of chrome-nickel steel and were sodium cooled. The lubrication system consisted of a main and a recovery pump. The ignition included two spark plugs per cylinder and was powered by two Scintilla MN7-DF magnetos. For the carburettor-fed models, the latter was a single Stromberg NA-R6D mounted vertically and feeding the cylinders via a distributor ring cast into the rear crankcase. The drive of the propeller was done without reducer.
The Continental R-670 engine was mounted primarily on the Boeing Stearman PT-17 Kaydet training biplane. It was also mounted on some Cessna, Fairchild (model PT-23), and various Waco. In addition to air use, these engines equipped, in different versions, armored vehicles or light military tanks for the U.S. Army (M1 Combat Car, M2 Light Tank, M3 Stuart, for example) and various machines for the U.S. Navy (LVT-4 Water Buffalo).
The Continental R-670 (factory designation W-670) was an air-cooled, seven-cylinder radial engine. This model was a successor to the first radial engine presented in 1929 by Continental, the A-70 with a displacement of 8.91 liters and developing 170 hp. Main production of the company in 1944-1945, this thruster could, with some minor adaptations, be mounted either on training aircraft, or on light tanks (U.S. Army) and also on amphibious vehicles ( LVT, Landing Vehicle Tracked) employed by the U.S. Navy. This reliable and versatile engine was widely manufactured (about 40,000 copies?).
The R-670 had a displacement of 10.94 liters The bore was 11.75 cm, for a stroke of 13.02 cm. The dry weight reached about 210 kg. The dimensions were, a diameter of 1.079 m, for a length of 86.84 cm. The power developed ranged from 210 to 240 hp. A Model K delivered 225 bhp at 2,175 rpm, a Model M delivered 240 bhp at 2,200 rpm. The fuel consumption was for these two types, in cruise mode, 49/57 liters per hour, that of oil 1.5 liters per hour.
The aluminum pistons were forged with heat treatment. They carried four segments (three of compression and a scraper, the third). The engine cases were made of two aluminum alloy castings. The timing comprised two valves per cylinder, actuated by tappets and rocker arms. The exhaust valves were made of chrome-nickel steel and were sodium cooled. The lubrication system consisted of a main and a recovery pump. The ignition included two spark plugs per cylinder and was powered by two Scintilla MN7-DF magnetos. For the carburettor-fed models, the latter was a single Stromberg NA-R6D mounted vertically and feeding the cylinders via a distributor ring cast into the rear crankcase. The drive of the propeller was done without reducer.
The Continental R-670 engine was mounted primarily on the Boeing Stearman PT-17 Kaydet training biplane. It was also mounted on some Cessna, Fairchild (model PT-23), and various Waco. In addition to air use, these engines equipped, in different versions, armored vehicles or light military tanks for the U.S. Army (M1 Combat Car, M2 Light Tank, M3 Stuart, for example) and various machines for the U.S. Navy (LVT-4 Water Buffalo).
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