The 177 cu in (2.9 L) side-valve four of the Model T, 20 hp in the car and cooled by thermosyphon, built from September 1908 to August 1941. Carden-Loyd used it in the Mark VI tankette at 22.5 bhp, and Italy kept it in the licence-built CV-29.
The 3.3-litre four of the GAZ-AA truck, the Ford Model A engine built at Gorky under the 1929 agreement with Ford, of about 40 hp. It powered the T-27 tankette.
The water-cooled Praga four of 30 hp (22 kW) that replaced the Ford in Czechoslovakia's licence development of the Carden-Loyd, the Tančík vz. 33. Its capacity is not published in the source.
The Meadows engine of the Vickers-Carden-Loyd 1934 artillery tractor supplied to Belgium: 3.3 litres and 51 hp. The source describes it as a five-cylinder, an unusual layout for Meadows, and the figure has not been confirmed elsewhere.