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The design of the injector tips is the primary factor of influence the fuel delivery system on parameters of a diesel engine. The location of the entrance edges spraying holes of injector tips is one of the most significant design data. In modern diesel engines, the injector tips are used with entrance edges of spraying holes are located in a volume of a cavity under a needle of an injector tip or on locking cone of the needle saddle. In this paper, the two different locations of the entrance edges of spraying holes are considered. Two real injector tips where selected for analyses and tests with different location of the entrance edges of spraying holes. The selected injector tips where modeled by using finite elements method and also these injector tips where installed on diesel and diesel characteristics where received. For selected injector tips, the three dimensional model of the injector tip parts was created.

One of the basic problems of improving the transport diesel parameters (the fuel economy and decreasing the exhaust gases pollution) is the perfection processes of fuel dispersion and fuel-air mixture creation. The difficulty of estimating the quality of these processes is caused by the complexity of the process in the diesel combustion chamber when the fuel is injected and evaporated. This paper offers a new method of estimating the quality of creating the fuel-air mixture in a high-speed diesel engine. The method is based on the results of non-motor tests. According this method, in a customary stand, used for test the diesel engines fuel-delivery equipment, an extra sensor is added to record the force of hydro-dynamic pressure of a fuel jet on a sensitive surface of the sensor. This sensor is created on the basis of a piezoelectric element, which has high sensitivity and good frequency characteristics (measuring range of frequencies up to 90 kHz).

It has become more urgent to use alternative fuels in diesels with growth of the world prices on petroleum and reduction of petroleum stocks. It is also important the reduction of emissions of carbonic gas concerning to group of “greenhouse gases”. Therefore, the vegetable raw material fuels represent the interest to use in a diesel. One of the most perspective alternative bio-fuels is the colza-oil. A number of problems are arising at work of diesel on the colza oil. The problems are eliminated by using mixes of colza-oil with diesel fuel. However, these mixes have increased density, viscosity, and superficial tension in comparison with standard diesel fuel. It results in deterioration of the fuel spray and mix-creation. It is offered the design of an injector, ensuring improvement of fuel spray and mix-creation in a highspeed diesel engine working on mixes of diesel fuel with colza oil. The researches of the offered injectors are carried out at a four cylinder diesel engine.