Assessment of the Stellite Valve Clearance in a Dual-Fuel CI Engine Powered by Natural Gas and Diesel

An analysis of the literature on the use of natural gas shows a significant increase in the number of natural gas-powered vehicles, both in road and sea transport, and diesel-fueled vehicles adapted to run on natural gas. Due to its combustion parameters, natural gas has a much more degrading effect on the exhaust valve seat than conventional liquid fuels. Such development forces the constant development of engines in vehicles fueled with natural gas, which means that the direction of research related to the improvement of engines and their modification is necessary and current. In addition to new vehicles, consumers relatively often decide to adapt used vehicles powered by diesel or gasoline to the requirements of natural gas-fired engines. Modifications to engines must take into account the properties of the new fuel. Specifically chemical combustion processes, determine the properties of the environment (temperature, pressure, etc.) where elements work. Modifications to power units must take into account the properties of the new fuel. Fuel, and more specifically chemical combustion processes, determine the properties of the environment (temperature, pressure, etc.) where this elements works. In this way, they affect the condition of structural elements, determining their durability and the time of their safe use. It was considered important to recognize the properties of natural gas in terms of its impact on the operational properties of the seat of exhaust valves as selected elements of the drive unit The article presents the measurement of valve clearance in dual-fuel engine powered by diesel and natural gas. The tests were carried out on an engine dynamometer.