Abstract
This study was conducted on a motorcycle engine that already has bi-fuel, with liquid phase LPG injection. However, when conducting experiments on the concentration of substances in the exhaust gas, the results show that the concentration of hydrocarbon in the tests has different effects. It is possible to see a sudden high hydrocarbon concentration at some point in time. Over time, the nozzle tip will gradually form ice around the nozzle due to LPG evaporation and heat collection. When forming large lumps, this ice will break off and move into the combustion chamber. A part of ice has not yet mixed with the air to create an explosive mixture, and the combustion process is not completed. The solution proposed is to use the method of heat transfer to the nozzle body by an electronic heating device. The experiment measured brake power at the wheel, fuel consumption, and concentration of pollutants in the exhaust gas according to each controlled temperature to supply to the nozzle body. With this result, a suitable nozzle supply temperature is selected to ensure that the engine achieves the most optimal power and fuel consumption and eliminates the phenomenon of abnormal hydrocarbon concentration. From the test results, 30OC is the most suitable temperature when adjusting the heating device around the nozzle.
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