Supramono, Nur Fadilah Rizky (2026) KARAKTERISTIK PHYSICAL CHEMICAL DAN LAJU PERTUMBUHAN DEPOSIT PADA MESIN DIESEL BERBAHAN BAKAR CRUDE PALM OIL (CPO) DAN B35 DALAM JANGKA PANJANG. Undergraduate thesis, Universitas Pembangunan Nasional “Veteran” Jawa Timur.
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Abstract
During long-term engine operation, differences in fuel characteristics can lead to deposit formation in diesel engines. Uncontrolled deposit accumulation has the potential to adversely affect engine performance. This study investigates the performance, emissions, and deposit growth rate of a Kubota RD 65 DI-NB diesel engine fueled with preheated Crude Palm Oil (CPO) and compares the results with those obtained using conventional diesel fuel. The experimental program consisted of three phases: (i) diesel engine performance testing conducted every 4 hours over 300 hours of operation; (ii) exhaust emission measurements and evaluation of deposit growth rate performed every 100 hours during the 300-hour operation period; and (iii) functional group analysis of deposits on each diesel engine component carried out after 300 hours of endurance testing.The performance test results indicate that B35 provides superior performance, with increases in brake power, brake torque, and brake thermal efficiency of 11%, 9.83%, and 27.54%, respectively, compared to CPO, along with lower brake specific fuel consumption. These differences are attributed to the physical and chemical properties of B35, which are more favorable for the combustion process. In terms of emissions, CPO produces higher levels of CO, SO₂, H₂, and particulate matter (PM), whereas B35 exhibits lower emissions of these parameters but shows a 51% increase in NOₓ emissions due to higher combustion temperatures. Deposit analysis reveals that CPO forms greater residues on the injector, cylinder head, piston crown, and valves, primarily due to its higher viscosity, sulfur content, and impurities, which lead to incomplete combustion.Overall, the results demonstrate that the use of Crude Palm Oil (CPO) increases the deposit growth rate on engine components, degrades combustion quality, increases brake specific fuel consumption, and affects exhaust emissions. Therefore, the application of Crude Palm Oil requires optimization of deposit growth control strategies to minimize its impact on engine performance and emissions during long-term operation.
| Item Type: | Thesis (Undergraduate) | ||||||||
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| Subjects: | T Technology > TJ Mechanical engineering and machinery | ||||||||
| Divisions: | Faculty of Engineering > Departement of Mechanical Engineering | ||||||||
| Depositing User: | Nur Fadilah Rizky Supramono | ||||||||
| Date Deposited: | 24 Feb 2026 07:07 | ||||||||
| Last Modified: | 25 Feb 2026 02:52 | ||||||||
| URI: | https://repository.upnjatim.ac.id/id/eprint/49741 |
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