Shahid Rajaee Teacher Training University (SRTTU) Journal of Computational & Applied Research in Mechanical Engineering (JCARME) 2228-7922 13 2 2024 03 01 Effect of exhaust gas recirculation and constant pre-heated air temperature on the homogeneous charge compression ignition combustion engine with diesel and WPPO 20 blend 157 167 2018 10.22061/jcarme.2023.8413.2135 EN R. Jyothu Naik Mechanical Engineering, Rayalaseema University College of Engineering Kurnool, Andhra Pradesh, 518007, India K. Thirupathi Reddy Mechanical Engineering RGMCET, Nandyal, Andhra Pradesh,518501, India S. Vishal Narayanrao Mechanical Engineering, Sandip University, Mahiravani, Trimbak Road, Nashik (MS), 422 213, India Journal Article 2021 09 16 This article describes an experimental study on fueling the port fuel injection homogeneous charge compression ignition (PFI-HCCI)  combustion engine with plastic oil that is generated from waste plastics through the pyrolysis method. The study tested different exhaust gas recirculation (EGR) levels of 0%, 5%, 10%, and 15% using a modified PFI-HCCI computerized 4-stroke, single-cylinder, water-cooled, direct injection Kirloskar diesel engine connected to an eddy current dynamometer. Furthermore, an engine running at 1500 rpm and a constant preheated air temperature (PHAT) of 140°C were assessed. In this experiment, fuel, 20% biodiesel waste plastic pyrolysis oil (WPPO), and continuous PHAT 140°C are used. The testing results show that the cylinder peak pressure and heat release rate for WPPO 20 with 15% EGR were attained at 39.70% and 15.09%, respectively. Additionally, port fuel injection with PHAT and WPPO 20% without EGR is reported to have a 45% higher brake thermal efficiency at full load in comparison to PFI-HCCI Diesel (D100). But when employed at full load with 15% EGR, the WPPO 20 blend also reduced smoke opacity by 30.74% and Oxides of Nitrogen (NOx) emission by 52.17%. On the other hand, compared to the PFI-HCCI (D100), there are higher emissions of  carbon monoxide (CO) (22.07%) and unburnt hydrocarbon (UHC) (54.14%) with 15% EGR. Consequently, WPPO can be used for the PFI-HCCI engine. https://jcarme.sru.ac.ir/article_2018_f9949fbdb87a6c0cd662ee5db1999b07.pdf