Abstract
This paper presents some theoretical and experimental aspects of a CI (Compression Ignition) engine fuelled by separate circuits of gasoil and methanol. The double injection fuelling method has been revealed to be the optimum one, comparing to those of diesel-carburetor and diesel-methanol mixtures, because of the possibility of using higher methanol substitute ratios, and assuring a safe and stabile engine running corresponding to different load-parts and revolution speeds regimes. This work tries to answer several questions referring to the main methanols influences on the development of the general combustion process inside the engines cylinder.