The growth of the automotive industry has made the market demand for motor vehicle spare parts soar, especially motorcycles, including the demand for cylinder blocks. Procedure of this research was carried out to analyze the product of 4 stroke motor cylinder block castings, which include; manufacture of casting product designs, manufacture of gating systems and riser systems. Results and Discussion based on the results of the shrinkage simulation test that has been carried out through the type of sand casting casting with the casting material, namely FCD-600-3 cast iron (1290oC) and the impression material used is silica sand (20oC) with a gravity casting type of casting, it can be concluded that the results of design testing 1 (one) obtained a filling velocity of 1.111 m/s, with a filling time of 3.8 seconds and a required solidification time of 6 minutes. In design 1 (one) there is a shrinkage defect due to shrinkage located on the sprue and riser of 0.336%. While the test results from design 2 (two) obtained a filling velocity of 1.09 m/s, with a filling time of 3.9 seconds and a required solidification time of 5 minutes. In design 2 (two) there is a shrinkage defect due to shrinkage located on the riser and in the cast product of 0.404%. The conclusion of the test results on both designs, it was found that design 1 (one) is the most optimal design for cylinder block casting planning.
The Energy Efficient Car Contest - Kontes Mobil Hemat Energi (KMHE) is an annual national level fuel efficient car competition organized by the National Achievement Center - Pusat Prestasi Nasional (Pusprenas) of the Indonesian Ministry of Education, Culture, Research and Technology in collaboration with one of the universities in Indonesia as the host. One of the categories of competition in KMHE is the Urban Concept type, which is a four-wheeled vehicle that looks like a car in general and is suitable for driving on the road with an internal combustion motor driven with alcohol as an alternative fuel. Vehicle weight is a major obstacle in efforts to save fuel. Vehicles must be designed in such a way that they are light in weight but without compromising their ability to drive. The weight of the Urban Concept vehicle is contributed by the engine, powertrain, body, chassis and driver's weight. The engine used must use an engine on the market (using premium/pertalite/pertamax fuel), so that weight reduction can only be done in other components. On this occasion, the students of SMK Negeri 1 Sambi, Boyolali, Central Java were given the concept of how to design a chassis and powertrain that meets the needs of a vehicle but is light in weight.
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