Anggono, W., Ichiyanagi, M., Saito, R., Gotama, G.J., Cornelius, C., Kreshna, R. and Suzuki, T. 2021. Airflow Characteristics Investigation of a Diesel Engine for Different Helical Port Openings and Engine Speeds. Journal of Engineering and Technological Sciences. 53, 3 (Jun. 2021), 210306. DOI:https://doi.org/10.5614/j.eng.technol.sci.2021.53.3.6.