Biodiesel impact on diesel engine high pressure pump plunger pairs
2016
Birkavs, A., Latvia Univ. of Agriculture, Jelgava (Latvia) | Kakitis, A., Latvia Univ. of Agriculture, Jelgava (Latvia) | Dukulis, I., Latvia Univ. of Agriculture, Jelgava (Latvia)
Biodiesel is increasingly used as an additive to fossil diesel fuel. For summer periods it is compulsorily in Latvia to use diesel fuel with 5 % biodiesel fuel mix. Under certain circumstances fossil diesel can be purchased blended with biodiesel up to 10 %. Using such fuel can cause problems, for example, with fuel freezing in cold weather, reduced energy density, and degradation of fuel under storage for prolonged periods. This study was carried out to determine biodiesel and its blend with fossil diesel fuel impact on high pressure fuel pump plunger pairs, if vehicles are idle for over 6 months. In order to determine with what force the plunger will move after long-term idle time, six different fuel samples were used: pure diesel fuel, diesel fuel with 5 %, 7 % and 10 % mix of biodiesel, pure rapeseed oil, and pure biodiesel. The obtained results show that increasing the biodiesel content in fuel blend with fossil diesel the agglutination force increases. As the agglutination force is much more less than the plunger spring force it allows the plunger to make a full stroke and the high-pressure fuel pump operation will not be disturbed.
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