Saat ini semakin banyaknya jenis kendaraan umum seperti sepeda motor membuat pengendara dapat memilih alternatif jenis bahan bakar pertamina untuk motor bensin antara lain premium, pertalite dan pertamax. Performa mesin motor dipengaruhi oleh beberapa faktor, diantaranya adalah jenis bahan bakar yang digunakan. Penelitian ini bertujuan untuk mengetahui perbedaan performa motor terhadap penggunaan variasi bahan bakar bakar premium, pertalite dan pertamax dengan melakukan pengujian daya dan torsi. Pengujian masing-masing jenis bahan bakar diuji pada mesin motor injeksi 115 cc tahun 2013 dengan menggunakan dynotest, yang terhubung dengan komputer. pada komputer akan mencatat grafik hasil perubahan daya dan torsi dari masing-masing jenis pengujian bahan bakar. Hasil penelitian menunjukkan torsi maksimum pada pertamax sebesar 9,86 N.m pada putaran mesin 3500 rpm dan torsi maksimum pada pertalite yaitu 9,91 N.m pada putaran mesin 3500 rpm. Sedangkan torsi tertinggi yang dihasilkan pada premium sebesar 9,67 N.m pada putaran mesin 3000 rpm. Sedangkan daya maksimum yang dihasilkan oleh premium, pertalite dan pertamax diuputaran mesin yang sama yaitu 7000 rpm untuk premium daya tertinggi sebesar 9,3 hp dan pertalite daya maksimum yang dihasilkan yaitu sebesar 9,3 hp. Sedangkan daya tertinggi yang dihasilkan pertamax sebesar 9,4 hp. Kata kunci : Daya dan Torsi, premium, pertalite, pertamax ABSTRACT Currently, more public vehicles such as motorbikes are use several choices of Pertamina fuel types for gasoline including premium, pertalite and pertamax. Motor engine performance is influenced by several factors, including the type of fuel used. This study aims to determine the difference of motor performance with the use of variations in premium fuel, pertalite and pertamax by testing power and torque. Testing of each type of fuel was tested on a 115 cc injection motorbike engine in 2013 using dynotest, which was connected to a computer. on the computer will record a graph of the changes in the power and torque of each type of fuel test. The results showed that the maximum torque at pertamax was 9.86 N.m at engine speed 3500 rpm and maximum torque at pertalite which was 9.91 N.m at engine speed 3500 rpm. While the highest torque produced at the premium is 9.67 N.m at 3000 rpm engine speed. While the maximum power produced by premium, pertalite and pertamax is supplied by the same engine which is 7000 rpm for the highest premium power of 9.3 hp and the maximum power pertalite produced is 9.3 hp. While the highest power produced by pertamax is 9.4 hp.
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