Minor Project.docx - Minor Project – Engine Block 1 INTRODUCTION The two stroke engine was first constructed in the early 1860s by German inventor

Minor Project.docx - Minor Project – Engine Block 1...

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Minor Project – Engine Block 1 I NTRODUCTION The two stroke engine was first constructed in the early 1860s by German inventor Siegfried Marcus [1]. It was the first of many developments that make it what it is today. Two stroke engines are commonly found in domestic power tools such as lawn mowers and line trimmers. Motorcycles in developing nations have moved to four stroke engines from the previous two stroke counter-part [2]. This is because waste emissions from two strokes are predominantly larger than four strokes. This is due to the nature of the geometry of two stroke engines. Two stroke engines contain vital parts and components that work together to function it properly. The most important is the engine block. The block mainly houses the crankshaft, piston, connecting rod and sparkplug. The block has passages such as the inlet and outlet ports as well as the transfer port. These passages allow the flow of oil, air/fuel mixtures, and exhaust. Due to high strength and low costs, cast iron alloys were used in the early manufacturing of engine blocks [3]. Aluminium alloys were then introduced as a lighter alternative to cast iron alloys. They can be used for lighter applications. Compacted Graphite Cast Iron is the most recent advancement for materials selection in making an engine block. The mentioned metal alloys can be casted by applying the Green Sand Moulding process, as well an alternative, Lost Foam Casting. 2 A NALYSIS The purpose of the engine block is to house components and parts that interact with each other to sustain the process of internal combustion. It is the core component of an engine, so it should be (at a minimum): Abrasion resistant High temperature resistant Tough (absorbing energy from vibrations) Pressure resistant during combustion The working requirements of the block include: Durability for the life of the vehicle Maintenance and ease of service Housing of parts and components Allowing flow of intended fluids and gases The material selection is the main attribute when it comes to the working requirements and functions of the engine block. Accuracy of the surface finish as well as the integrity depend on the casting process done. Lost Foam Casting excels in these areas over the Green Sand Moulding process.
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  • Three '17
  • Alloy, Sand casting, Tensile strength, Cast iron, Raffi Jamgotchian

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