This is an experimental work done to develop a test engine to evaluate high performance diesel engine oil for soot related oil thickening properties. This work aims to modify the various engine hardware parameters which effects the soot formation, to make the engine ready to deliver nearly about 5% soot levels. Experiments were conducted in three phases of 150 hours, 150 hours and 252 hours each respectively, with each phase increasing in test severity from the previous. This resulted in 16 oil samples and showed increase in soot values from 0.2% to 4.58% with increasing phases. The test severity was generated in order to match real time environment by modifying the various engine hardware parameters like air throttling, maximum retarded injection timing and increase fuel delivery from the fuel injection pump, auxiliary air supply, auxiliary oil sump unit, increased piston-ring clearance and change in injector pressures. Experiments were also conducted at these varying parameters individually, to study the effects of these parameters on oil viscosity and total base number. Experiments with different operating temperatures i.e., @ 75oC and 90oC were also conducted. The results obtained confirms that the oil viscosity increases with increase in soot levels and the total base number slightly decreases with increase of soot in lubricating oil. The results obtained were analysed using thermo gravimetric analyses (TGA) technique, to determine significance of variables on soot values, oil viscosity and total base number
Dec 01, 2013 - Jun 30, 2014