After NDF tests have been completed, the adapted carburetor, which main features are given above, was mounted through the intake manifold of the engine. Also, as shown in Fig. 2, a small water tank, a scaled glass bulb and a flexible pipe were used to introduce water into intake air and to measure it. Any other adaptation on the engine and on the experimental system was not done. Also, the engine mainly operates due to diesel principle. Experimental procedure applied in the present study is given briefly in the following paragraphs