Influence of ultra injection pressure with dynamic injection timing on CRDI engine performance using Simarouba biodiesel blends

This paper presents an experimental investigation carried out on a "single cylinder diesel engine upgraded with a common rail direct injection (CRDI) system. Tests were conducted by fuelling high-speed diesel (HSD) and Simarouba biodiesel (SOME) blends to study the influence of injection pressure (IPR) and injection timing (ITG) on the performance and emissions. Four unique IPR of 400 bar, 600 bar, 800 bar and 1000 bar with four different ITG of 10°, 13°, 15° and 18° before top dead center (bTDC) combinations were taken for study with the engine loading varied from 25% to full load. Critical performance parameter like brake thermal efficiency (BTE) and brake specific fuel consumption (BSFC) were calculated, while, the primary emission parameters of the diesel engine, the NOx and smoke opacity were recorded. From the results it is concluded that the given engine recorded favourable results at IPR- ITG combination of 800 bar and 13° bTDC for all fuels tested at higher load conditions specifically at 75% load to full load. Among the different fuels investigated SOME30 yielded the best performance and moderate emission at this combination of IPR- ITG.