This paper presents the results of practical mechanical tests of motor oils, their specifications and characteristics and the effect of their physical and chemical properties on the performance of the engine. The performance of the engine has a strong relation with the engine oil type and efficiency. The degree of stability of oils properties is very important because if oil or lubricants lose their properties, mechanical and chemical excessive corrosion of the motor metals may occur. Consequently, damage occurs to one or more parts of the engine, thereby the system is breaking down where the cost of downtime is too expensive. It has been found that a higher viscosity value is not the optimum as it increases temperature and energy consumption due to frictional losses. The values required for viscosity is the ideals that gives the stable results regardless temperature variations under any conditions of operation, at which the power losses are minimal and the fuel economy is optimal.
This paper presents analysis for the slipping phenomenon in automobiles; the parameters affects slipping of automobiles are discussed. An analytical equation is constructed to relate all factors affect slipping ratio. Some relations are predicted to show the factors affect the slipping in automobiles. It is found that the parameters affect slipping can be summarized as: radius of curvature of the curve, angle of the curve (slope), RPM of the tire, radius of the tire in addition to the nature of the road. It is found that: as the normal acceleration increases the slipping ratio decreases, as the RPM of the tire increase the slipping ratio increases and as the radius of the tire increases the slipping percent increases. It is obvious that as the path slope (tan θ) increases the slipping value decreases. It is noticed that: as the radius of curvature increase the slipping % decrease which is logic, since the slipping on straight dry path is nearly close to zero. Also it is noticed that: as the tire radius decreases the slipping % increases.
This paper presents the role of E-commerce and E-technology in simplifying operations of preparing quotations and contracts of supporting engineering and scientific laboratories by required equipments and tools at Jordanian universities. The experimental and practical sides of education in scientific colleges in Jordanian universities is very important, so many quotations and contacts are performed and required each year, and E-commerce also offers the required information and specifications to persons responsible to do such contacts by using Business-to-Consumer, Consumer-to-Consumer or Business-to-Business principles. By searching about such equipments using search engines, many companies present their products and their specifications and give you the opportunity to select the suitable devices and tools depending on their specifications and prices. Case studies are discussed for some devices to show how much E-commerce simplifies this operation. It was found that E-commerce and E-technology reduces both time and efforts required to support both engineering and scientific labs with their needs from equipments, catalogs and tools required to such devices.
This paper presents a suggested injector test bench construction, and also testing of its performance and application, because there is no device for testing the workability for this kind of injectors. Also, service dealers in Jordan and Middle East replace all injectors of any equipment, equipped with this kind of injectors when an overhaul for the engine is needed, which means at least eight injectors are replaced even if not all of them are not working properly. So, this bench will save a lot of money if the properly working injectors are not replaced; knowing that each single injector costs around $1900. When testing the injector, it could be known from the problem existed after analysis, the type of maintenance needed for this injector.
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