The current research is to investigate the performance and exhaust emission of variable compression ratio (VCR) of diesel engine by using 50 ppm α-Al2O3 catalyst with each blend of chicken fat CF5 (5% chicken fat and 95% diesel), waste cooking oil WC5 (5% waste cooking oil and 95% diesel) and combined chicken fat with waste cooking oil CF&WC5 (2.5% chicken fat + 2.5% waste cooking oil and 95% diesel). Biodiesel’s performance and emissions parameters are analyzed at CR = 17 & 18, considering the load varies from 25% to 100%, compared with pure diesel. The results show that the 75% and 100% loading CF&WC5 have maximum brake thermal efficiency of 25.49% and 24.72%, respectively, for CR = 17 with BSFC of 0.35 kg/kWh. However, as CR = 18 increases, CF&WC5 develops a BTE of 25.66% with BSFC of 0.33 kg/kWh at 100% loading conditions. This indicates that the CF&WC5 reduces BSFC by 5.71%, resulting in a higher CR of 18. The novelty of the experiment is to reduce the NOx emission of 498 ppm and the COx emission of 0.12 volume at full load condition for CR = 18. Thus, a higher compression ratio reduces about 14% of volume compared to pure diesel CO emission. It is also observed that the HC emission of CF&WC5 reduces 39% of vol. with smoke opacity up to 3% of vol.
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