From my literature, there are 3 types of soot measurement, i.e. soot in exhaust emission, soot deposited in cylinder wall and soot in lubrication oil. But which one is more significant to the further study?
Soot deposited in cylider and soot formed due to contamination of lub oil are the causes and formation of soot in the exhaust system is the result. The objective of studies is to control the pollutant. Hence formation of soot in the combustion (which depends of quality of fuel, density of fuel C/H ratio of fuel composition, viscosity, which affects the injection pattern of fuel spray in cylinder, volatility of fuel, engine parameters such as injection timing, injection pressure, compression ratio, etc) is to be taken care of..
Prof. Krishna gave the complete answer. I just would like to add pieces of information. Generally, soot in the engine exhaust gaseous is composed mainly of carbonaceous elements (elemental or organic), soluble organic part dispersed within the porous of carbonaceous compounds (mainly of heavy oils and non-vaporized fuel aerosols), metal compounds (from erosion and wear of moving engine elements) and finally gaseous part that fill the all porous. Thus it would be useful to investigate the soot composition in the exhaust gaseous. The other two mentioned types of soots will be included in that detected in the exhaust gaseous.
Engine Wear depends on the load, speed, soot formation, temperature.In a lubricated diesel engine system, cylinder wall soot are washed away by lubricating oil. if the lub oil contaminated,the engine performance( thermal efficiency) is decreased.
I also agree with the above comments and indeed exhaust soot is the most significant to study in engine wear. My PhD work was related to soot wear but I have used carbon black as stimulant to soot and you can view my papers if you like.
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