This research examines the effect of installing a Turbo Cyclone on a 4 stroke gasoline engine on fuel consumption and exhaust emissions. This research is a quantitative study using experimental research methods. The 4 stroke petrol engine used is the Yamaha Jupiter MX 135 cc. The data were processed in several stages of analysis using the mean formula, fuel consumption, the percentage formula, and comparing the results of data analysis from each treatment. From the results of data analysis, it was found that the installation of the Turbo Cyclone had an effect on fuel consumption and exhaust emissions from the 4 stroke engine. The best effect is obtained from the installation of the Turbo Cyclone after the carburetor, fuel consumption shows a decrease of up to 8%, exhaust emissions show a decrease in HC levels by 9% and an increase in CO2 levels by 1%.  Penelitian ini mambahas pengaruh pemasangan Turbo Cyclone pada mesin bensin 4 Tak terhadap konsumsi bahan bakar dan emisi gas buang. Penelitian ini  merupakan penelitian kuantitatif dengan metode penelitian eksperimen. Mesin bensin 4 Tak yang digunakan adalah Yamaha Jupiter MX 135 cc. Data diolah dengan beberapa tahapan analisis menggunakan rumus  mean, konsumsi bahan bakar,  rumus persentase, dan membandingkan hasil analisis data dari masing-masing perlakuan. Dari hasil analisis data didapatkan adanya pengaruh dari pemasangan Turbo Cyclone terhadap konsumsi bahan bakar dan emisi gas buang dari mesin 4 Tak tersebut. Pengaruh yang paling baik didapat dari pemasangan Turbo Cyclone setelah karburator, konsumsi bahan bakar menunjukkan penurunan mencapai 8%, emisi gas buang menunjukkan penurunaan kadar HC sebesar 9% dan peningkatan kadar CO2 sebesar 1%.

The Velocity Air Intake System is an important component in a motor vehicle engine, particularly in a 155cc engine. Its function is to optimize the airflow process to the throttle body or carburetor. However, many users or people tend to overlook the significance of improving engine performance by varying the model or replacing the velocity air intake system itself. One common issue is the diameter and shape of the airflow model, which can affect the power, torque, and exhaust emissions produced. Installing a velocity air intake system is one approach to achieve an efficient air delivery process into the combustion chamber. In our research conducted using a dyno test on a 155cc four-stroke engine, the results showed that using a 46 mm size yielded the highest power of 11.03 Hp and produced a torque of 12.39 N.m. Using a 47 mm size resulted in 11.02 Hp and decreased the torque to 12.28 N.m. With a 48 mm size, there was a decrease in power to 11.00 Hp and an increase in torque to 12.72 N.m, while using a 45 mm size led to a decrease in power to 10.09 Hp and produced a torque of 11.31 N.m.

Bio-additives are elements derived from plants that are utilized as additives to improve fuel quality. Lemongrass fragrant oil is one of the types used as bio-additives that are volatile and soluble into fuels. The purpose of using this bio-additive is to improve the performance of the machine, but the resulting emissions must be in permissible regulations. This research was conducted by experimental methods, some of the tested samples consisted of gasoline (Pertalite), then the development was done by adding the element of lemongrass aromatic bio-additive on the fuel with a ratio of 1.5:1000 ml, 2.0:1000 ml, 2.5:1000 ml, 3.0:1000 ml, and 3.5:1000 ml. The sample test was carried out to measure engine performance, exhaust emissions, using Sportdevice Dyno and Emission Tester. Also, fuel consumption testing is carried out to determine the efficiency of fuel consumption. The results of this study the use of a fragrant lemongrass bio-additive can improve the performance of the motorcycle, maximum power increased by 3.11% at a ratio of 3.0:1000 ml and optimum torque are achieved at 2.03% at a ratio of 2.0:1000 ml. Then the result of exhaust emission measurement of HC and CO elements arising from the use of lemongrass bio-additives is still environmentally friendly In addition to the testing, fuel consumption measurement is also done by generating a savings of 20.93%, mileage 69.9 Km/L ratio using a ratio of 3.5:1000 ml.

Citronella is a variety of bioadditives that are easily soluble and evaporate into fuel. The use of Bioadditives in fuel aims to improve engine performance and fuel economy. The method used in this research is an experiment with RON 90 Gasoline samples, and a mixture of Citronella Bioadditives with a ratio of S1-1.5%, S2-2.0%, S3-2.5%, S4-3.0%, and S5-3.5%. Engine performance testing using Sportdevice Dyno and impacted engine performance increased by 3.11% on the S4-3.0% type, and maximum torque increase reached 2.03% on the S2-2.0% ratio. The fuel economy test based on the distance traveled with 1000 ml of fuel volume per sample at an average speed of 40-60 km/h was able to achieve a savings of 20.93% on the S5-3.5% sample with a distance of 69.9 Km/l. This is different from RON 90 gasoline without citronella mixture can only be traveled as far as 57.8 km / l. Serai Wangi merupakan ragam bioaditif yang bersifat mudah larut dan menguap ke dalam bahan bakar. Pemakaian Bioaditif dalam bahan bakar bertujuan untuk meningkatkan performa mesin dan penghematan bahan bakar. Metode yang dipakai dalam riset ini adalah eksperimen dengan sampel Bensin RON 90, dan campuran Bioaditif Serai Wangi dengan rasio S1-1,5%, S2-2,0%, S3-2,5%, S4-3,0%, dan S5-3,5%. Pengujian performa mesin mengunakan Sportdevice Dyno dan memberi dampak prestasi mesin meningkat sebesar 3,11 % pada jenis S4-3,0%, dan kenaikan torsi maksimum mencapai 2,03 % pada rasio S2-2,0%. Uji Penghematan bahan bakar berdasarkan jarak yang ditempuh dengan 1000 ml volume bahan bakar setiap sampel pada kecepatan rata-rata 40-60 km/jam mampu meraih penghematan sebesar 20,93% pada sampel S5-3.5% dengan jarak tempuh sejauh 69,9 Km/l. Hal ini berbeda dibandingkan dengan bensin RON 90 tanpa campuran serai wangi hanya mampu ditempuh sejauh 57,8 Km/l.