Experimental evaluation of small changes in mechanical losses under bench test conditions

Expanding the range of energy-saving automotive lubricants in the Russian market, as well as the desire of internal combustion engine manufacturers to improving their fuel economy by means of macro and microprofiling or by using special coatings of rubbing surfaces in piston assemblies, stimulates seeking effective, simple, and informative methods for evaluating mechanical losses. This paper substantiates the need for the new methods of analysis of small changes in mechanical losses. An experimental method for determining temperature fields in the cylinder is presented. Its advantages over the conventional scrolling technique are discussed. The applicability of this method for assessing the influence of antifriction properties of motor oils, high-speed mode, and the piston skirt profile on the mechanical losses is verified experimentally.

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