It's 'Tsentralniy Institut Aviatsionnogo Motorostroeniya' or the Central Institute for the Development and Construction of Aeronautical Engines. Sometimes simply referred to as IAM.

- Bessonov was the one who designed an engine at the Center, the MM-1, with 250/300 hp and general lines similar to the DeHavilland Gipsy Six. Year 1936.

“MM-1”

- The MM-2, was an inverted, air-cooled V12 giving 450 hp.

- The VAD-2 and VAD-3, delivered 30 hp and 45 hp respectively. They were small geared, air-cooled engines with inverted inline 4 and 6 cylinders.

There were other lesser-known projects, such as a 24-cylinder H-engine around 1931.

More recently, there are projects such as the IZh engine from the TsIAM Motiv group, known as the 700, giving 60 hp.

It had two water-cooled, in-line cylinders.

According to a publication it has a reduction gear, although it is not visible.

From the same group, the DD-700/45R model is known, a 45 hp engine with two air-cooled, horizontally-opposed cylinders.

“D-700/45R engine”