In engines pistons are very important parts to produce power. Piston fail mainly due to mechanical stresses and thermal stresses. An analysis of thermal stress and damages due to application of temperature is presented and analysed in this work. Aluminium alloy have been selected for thermal analysis of piston. Results are shown and a comparison is made to find the most suited design Analysis of piston crown is done with boundary conditions, which includes pressure on piston head during working condition and uneven temperature distribution from piston head to skirt. There are four types of piston crown that has been analysed in this project. The CAD model is created using CATIA software. CAD model is then imported into ANSYS software for geometry and meshing purpose. Complete design is imported to ANSYS 15 software then analysis is performed. I. INTRODUCTION The modern trend is to develop IC Engine of increased power capacity. One of the design criteria is the endeavor to reduce the structures weight and thus to reduce fuel consumption. This has been made possible by improved engine design. These improvements include increased use of lightweight materials, such as advanced ultra-high tensile strength steels, aluminum and magnesium alloys, polymers, and carbon-fiber reinforced composite materials. The integration of lighter weight materials is especially important if more complex parts can be manufactured as a single unit. In the next 10-20 years, an additional 20-40% reduction in overall weight, without sacrificing safety, seems to be possible. Withstand loads tending to elongate. In other words, compressive strength resists compression. Compressive strength is often measured by universal testing machine. In this work Eutectic Al Alloy (Si 11-13%) was taken as piston material. Initially thermal and structural analysis was performed on Al Alloy piston without silicon nitride crown and then with silicon nitride crown using the software ANSYS. Then the results obtained are compared. The comparison of results indicated that the piston which is arranged by silicon nitride crown is better to withstand high thermal and structural stresses than the piston which is not arranged by silicon nitride crown. The present work has been undertaken with the following objective, To design an IC engine (piston and piston ring) by using CATIA V5 R20 software, To perform the thermal analysis (of piston and piston ring) using ANSYS 15 software. Engine pistons are one of the most complex components among all automotive and other industry field components. The engine can be called the heart of a vehicle and the piston may be considered the most important part of an engine. There are lots of research works proposing, for engine pistons, new geometries, materials and manufacturing techniques, and this evolution has undergone with a continuous improvement over the last decades and required thorough examination of the smallest details. Notwithstanding all these studies, there are a huge number of damaged pistons. In this analysis project we...

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Due to the growing importance of environmental issues in modern society, the global economy has been compelled to refocus further towards eco-friendly, low-pollution technologies based on waste recycling. Furthermore, these technologies not only offer economic value to products at the end of their life cycle, but they have the ability to address the issue of inadequate waste storage in landfills. At the same time, given the growing trends in the number of vehicles, the demand for lubricants is also increasing, which involves the generation of larger and larger amounts of used engine oil. Being included in the category of hazardous waste, it requires management based on sustainable principles, and recycling is recommended as a preferred method of treatment, as it still has a high economic value. This article aims to present some of the technologies that have been effectively implemented on a global scale for the recycling of used engine oil, as well as a series of advantages that these processes present, both ecologically and from an economic perspective.

Abstract. This paper presents three methods for reduce thermal losses in the intake system with improvement of airflow and thermal protection. In the experiment are involved two patented devices conceived by the author and one PhD theme device: 1-Dynamic device for air transfer, 2-Integrated thermal deflector, and, 3-Advanced thermal protection. The tests were carried on different vehicle running in real traffic and in the Internal Combustion Engines Laboratory, within the specialization "Road vehicle" belonging to the Faculty of Engineering Hunedoara, component of Politehnica University of Timişoara. The results have been processed and compared whit the ones obtained without these devices. Air temperature influence on fuel consumption and exhaust emissionsRecent studies show significant differences in fuel consumption and exhaust emissions depending on the temperature of the intake air. It is well accepted that the combustion and emissions characteristics are highly rely on the oxygen availability and fuel properties. The excess of oxygen resulted in very lean mixture that lead to the instable combustion and misfire. In fact, lean mixture tends to promote a longer ignition delay and a slower burning rate resulted in longer combustion duration. This condition creates longer time for heat transfer from combustion to the end gas that lead to the knocking phenomenon. However, the engine operates with deficiency of oxygen resulted in rich mixture that leads to the higher unburned gaseous fuel due to shorter ignition delay and faster burning rate.Therefore, it is vital to make sure the charged air entered into the combustion chamber was sufficient of oxygen in order to promote complete combustion. The previous researches also showed that the air intake temperature has a significant role to increase the combustion efficiency, stability and reduced exhaust emissions [1][2][3].Based on previous study, fuel economy can be improved through several strategies such as introduce electronic devices into the gasoline engine. In general, lower fuel consumption and less emission can be achieve by having complete combustion in the combustion chamber. The increased oxygen availability in the combustion chamber can promotes complete combustion and oxidation of both CO and HC emissions. Controlled air intake temperature is one of the possible methods to promote higher combustion efficiency and improved combustion stability. Air intake temperature is important to ensure higher amount of fuel involves in the combustion process. Besides that, air intake temperature will also control the exhaust emissions and combustion process [1].