Continental R-670

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. 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
 * W670-L:carburetor, 5.4:1 compression, 73 Octane, rear exhausts and 225 hp
 * W670-M:carburetor, 6.1:1 compression, 80 Octane, front exhausts and 240 hp
 * W670-N:carburetor, 6.1:1 compression, 80 Octane, rear exhausts and 240 hp
 * W670-K1:fuel injection, 5.4:1 compression, 73 Octane, front exhausts and 230 hp
 * W670-L1:fuel injection, 5.4:1 compression, 73 Octane, rear exhausts and 230 hp
 * W670-M1:fuel injection, 6.1:1 compression, 80 Octane, front exhausts and 250 hp
 * W670-N1:fuel injection, 6.1:1 compression, 80 Octane, rear exhausts and 250 hp

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)