Dnipro University of Technology — Compliance with the Time
ContentsSTUDY ON COMPONENT WISE FRICTIONAL POWER OF A SMALL SPARK IGNITED ENGINE C Ramesh Kumar, M Senthil Kumar Automotive Research Center, VIT University, India Abstract. During the process of engine downsizing or modification knowledge of friction power is required to determine the actual power produced inside the combustion chamber of an engine. Though lubricating oils are used for avoiding direct contact of moving and rotating components, the friction is inevitable in engines. It is a very well known fact that an internal combustion engine consumes around 20 % of the indicated power. Efforts are being made by researchers around the world to reduce the energy consumed by friction by exploring various methods. But all these methods are inclined towards reduction in fuel consumption there by reducing the carbon footprint instead of component wise analysis for longer life and overall engine performance. In this current investigation, a detailed study is carried out on contribution by each and every component towards frictional power. This will shed light on analyzing frictional power in an enhanced way. The total engine friction is evaluated initially by fuelling the engine. To account for the total engine friction measured, component wise friction analysis is carried out by stripping down one component at a time and running the engine with the help of a prime mover. Frictional loss in piston and rings is expected to be around 40 to 50% of the total frictional power loss and the rest by valve train, about 20 to 30% and the remaining 20 to 30% is accounted by rest of the relatively moving components. In addition to the study mentioned above the effect of lubricating oil temperature and percentage of friction modifier in lubricating oil is also explored and presented. Keywords: Frictional power, component friction.
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