OPTIMASI PENYETELAN CELAH KATUP TERHADAP EMISI GAS BUANG PADA SEPEDA MOTOR MATIC

The development of the number of motorized vehicles in Indonesia is increasing rapidly every year, most motorized vehicles can produce bad exhaust emissions, either due to inadequate maintenance or bad driver behavior. Air pollution that has occurred so far is largely due to the presence of motorized vehicles as a means of transportation. Most of the air pollution is caused by motor vehicle emissions. Motor vehicles emit harmful gases which can have a negative impact, both on human health and the environment. This research method is experimental with a research data collection design namely Optimization of valve clearance adjustments on vehicles, then the results of the settings that have been observed with differences in valve clearance adjustments with lower exhaust emissions of CO and HC. This study was then given the treatment of IN valve clearance adjustment of 0.03 mm, 0.04 mm, 0.05 mm 0.06 mm, 0.07 mm, 0.08 mm,
0.09 mm and EX valve; 0.05 mm, 0.06 mm, 0.07 mm, 0.08 mm, 0.09 mm, 0.10 mm,
0.11 mm at each rotation of 900rpm, 1400rpm, 2000rpm and 2100rpm with the aim of knowing exhaust gas characteristics that come out of the vehicle into the environment. With the experimental results of optimizing the IN valve gap of 0.04 mm, the EX valve 0.06 mm gets 0.04% CO, 28ppm HC at 900rpm rotation, 1400rpm CO 0.11% rotation. HC 156ppm, 2000rpm rotation. CO 0.09%. HC 26ppm, and for 2100rpm rotation. CO 33%. HC 44ppm. Referring to the Regulation of the Minister of Environment Number: 05 of 2006, it can be concluded that the exhaust emissions resulting from optimization are categorized as environmentally friendly.
Keywords: valve clearance adjustment, exhaust emissions.