Paenpong C, Pratoomchai N. Performance evaluation of a small spark-ignited engine with an electromagnetic intake valve . J. Res. Appl. Mech. Eng. [internet]. 2020 Dec. 22 [cited 2025 May 14];9(1):JRAME-21. available from: https://ph01.tci-thaijo.org/index.php/jrame/article/view/240996