Internal combustion engines as a technology of energy conversion, their great variety and a huge number of modifications. The annex contains the most common engine engines, various in layout and structure. Car engines are complex and unusual as well as the simplest and most common. From the application you will learn about an unusual airplane engine, and that a car’s engine is not only in-line, but also that the engines of cars vary in volume and power. The application has a history of creation and the principles of the internal combustion engine. The application will be interesting to those who want to find out how the structure of engines developed, how different layouts of engine pistons differ and so on. We hope our application will be interesting to you.