Abstract
It is generally known that exhaust system or commonly called muffler is a vital/main part of a motor cycle. Therefore in the automotive sector/field, this product is progressing rapidly and increasing the customer. Exhaust functions are to increase to speed, to beautify the shape and to acquire the good sound hearing. But infect, many people disregard to improve/increase engine performance by utilizing the exhaust gas itself. Related to exhaust gas issue and focus on back pressure that occurs during disposal process, some exhaust products with different size of header diameter are taken and analyzed to determine the amount of back pressure generated. The analysis using ANSYS R15.0 program and the direct test using DYNOJET Model 250.The simulation result show the amount of back pressure that occurs in the header exhaust for each type of exhaust. The first type of exhaust (muffler type 1) the largest/the most back pressure is 3172.04 Pa, for the second type of exhaust (muffler type 2) the pressure is 2775.66 Pa, the third type of exhaust (muffler type 3) produce 1138.39 Pa back pressure and the fourth type of exhaust (muffler type 4) produce the smallest back pressure is 562.64Pa.The result of the four stroke 135cc motor cycle for each type of muffler using the Dynojet show that the muffler type 1 on the 7340 rpm max torque 0.89 kg.m (8.73 N.m) on round of 8150 rpm generating a max power 9.26 PS (6811 watt). For muffler type 2 on around 7160 rpm produce max torque 1.05 kg.m (10.3 N.m) and max power 10.57 PS (7774.21 watt). For muffler type 3 at the around 7250 rpm produce max torque 1.13 kg.m (11.08 N.m) and max power 11.50 PS (8458.22 watt). And for muffler type 4 at around 7240 rpm produce max torque 0.95 kg.m (9.31 N.m) and at the around 8520 rpm obtained the max power is 10.26 PS (7546.21 watt). Torque and the biggest power generated by the muffler type 3 while torque and smallest power generated by the muffler type 1.
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