• MECHANIZATION IN AGRICULTURE

    Research of combustion engine oil quality over exploitation period

    Mechanization in agriculture & Conserving of the resources, Vol. 68 (2022), Issue 1, pg(s) 7-10

    Different types of oil are used widely in all over the world. It is used for lowering friction force at the contact zones, e. g., bearings, gears and other areas where at least one element is moving in relation to another one. Several types of oils find place in automotive industry: mineral, semi-synthetic and synthetic. Over the time oil characteristics were improved by enriching with different additives. Special additives can reduce friction forces, present better wash of abrasion products, extend oil life, etc.
    This article deals with the research of degradation of oil lubrication quality in vehicle combustion engine over the exploitation period.
    Quantity of contaminating particles in oil sample was determined by optical microscopy. Oil film strength test was performed with oil samples used after various exploitation periods.

  • MACHINES

    THE INFLUENCE OF LUBRICATION OILS AND FILTERS ON THE OILS PRESSURE, TEMPERATURES AND FLOW DURING ENGINE WARM-UP AT SUMMER CONDITION

    Machines. Technologies. Materials., Vol. 10 (2016), Issue 10, pg(s) 13-16

    The key issue to an automotive engine’s reliability and its durability is the quality of the lubrication system. The primary task of the lubrication system is to provide a continuous supply of filtered oil between two sliding surfaces. By using adequate lubrication oils will reducing friction between moving mechanical parts. Rheological characteristics of lubricating oil directly caused the friction losses due to internal engines mechanisms (piston group, valve train, fuel pump, crankshaft, bearings and seals, etc.). The main components of lubrication system has a poor lubrication during cold start up process of an IC diesel engine and thus is necessary a proper lubricating oil to full fit the complex demands of all engine components and subassemblies. The aim of this paper is experimental investigating of the influence for different classes lubricating oils characteristics and oil filters which are present in market of Republic of Kosovo, especially those with lower prices on engine oil pressure, temperature and flow during start up until the oil warms up some. The obtained results are taken from measuring device which is installed into Fiat passenger car with Spark Ignition Engine for different working regimes.