Engine-out characterisation using speed-load mapping and reduced test cycle for a light-duty diesel engine fuelled with biodiesel blends

► Effects of palm, coconut and soy biodiesel on engine outputs were investigated. ► Phase I examined how speed/load affects emissions and performance of biodiesel. ► Phase II appraised performance of biodiesel blends under a steady-state test cycle. ► Biodiesel with lower degree of unsaturation reduces UHC, NO and smoke opacity. ► Both NO-smoke reduction achieved with at least 1 vol.% PME or 50 vol.% CME in diesel.