Due to the danger of depletion of world petroleum reserve and environmental concerns the “Philippines Biofuels Act of 2006” (Republic Act No. 9367) was established to develop and strengthen the use of local sustainable fuels, particularly the use of Coconut Methyl Ester (CME) biodiesel blends in the country. As of 2015, with respect to biodiesel in the Philippines only 2% of biodiesel is required to be blended in commercially available fuels. The National Biofuels Board of the Philippines is planning to increase the percentage of the blend within the next 5 years however only few studies are conducted to prove the effectiveness of the increase in percentage. Also in pursuant to “Philippine Clean Air Act of 2009” (Republic Act No.8749) The Department of Environmental and Natural Resources (DENR) issued an administrative order with regards to the implementation of EURO 4/IV Emission Limits within the country. This study investigates the influence of various CME Biodiesel blends in a light duty automotive CRDi engine without any engine modifications through evaluation of performance and emission characteristics, The emission characteristics will be also be investigated if it meets the EURO 4/IV emission limits set by DENR. Five fuel blends B2 (2% CME, 98% Neat Diesel), B5 (5% CME, 95% Neat Diesel), B10 (10% CME, 90% Neat Diesel), B15 (15% CME, 85% Neat Diesel) and B20 (20% CME, 80% Neat Diesel) were used and their results is compared to B0 (Neat). This will also The tests were performed at the University of the Philippines Vehicle Research and Testing Laboratory at steady state conditions, a naturally aspirated water cooled four cylinder Common Rail Direct Injection Diesel (CRDi) engine, with varying speeds from 800 to 4000 RPM at an interval of 400 RPM while maintaining the throttle 100% wide open. As a result of the investigation at typical engine speed range (1200–2400 RPM) no significant differences for biodiesel blends vs. neat diesel were observed for torque, power, CO2 and NOx emissions. However, a decrease of HC and CO was observed. Meanwhile, at 2800–4000 RPM, an increase in torque, power, CO2 and NOx, but no significant differences in HC and CO emissions. However, the engine does not normally run at the higher speed range (1800–2400 RPM) for a long period of time. With respect to biodiesel blends, torque, power, CO2, and NOx emissions generally increase with increasing biodiesel blend, while CO and HC emissions generally decreased with increasing biodiesel blend.

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