Abstract
In the paper the author presents some researches and practical results concerning the conversion of some engines on the heavy power motor vehicles used into a hydrotechnics buildings site from the electric starting system to the pneumatic systems. Researches demonstrates that the recommended system is the injector-valve system, which is very compact and robust. The complete unit needs an engine driven compressor and an air bottle for 18-32 bar. If the engine driven compressor doesnt exist than is needed a stationary electric-driven compressor and an air storage tank to feed, when needed , the air bottles on the vehicle.
The applied technical solution have given very good economicaly results and reveals the present interest of the idea. Taking into consideration the actual potential of the technique we can hope to a rapid spread of these systems, especially due to the environmental impact.