Uludamar, ErinçÖzcanlı, MustafaÇelebi, KerimcanAydın, Kadir2025-01-062025-01-0620192587-111010.26701/ems.564849https://doi.org/10.26701/ems.564849https://search.trdizin.gov.tr/tr/yayin/detay/338587https://hdl.handle.net/20.500.14669/626Noise is a very important phenomena for passenger comfort in a vehicle. Engine of the vehicles producedisturbing noises in different frequencies. In the application of acoustic, there are different filters to predict thesound pressure level and disturbing noises. The aim of the present study is to investigate the noise characteristicof a compression ignition engine at different weighting filters. In the experiments, the engine was fuelled withlow sulphur diesel and sunflower biodiesel fuels and it run at different engine speeds ranging from 1200 to 2400rpm, with steps of 300 rpm. The results indicated that noise characteristic of compression engine with enginespeed shows different trends at A- weighting filter than C- and Z- weighting filters especially at 1500 rpm.Moreover, in the study, it was cleared that the SPL decrease with the addition of biodiesel fuel regardless of itsratio.eninfo:eu-repo/semantics/openAccessMühendislikMakineAkustikArticle913883385873