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SMAT2008E20EXAUST EMISSIONS OF DIFFERENT BLENDS OF BIODIESEL ANDPETRODIESEL IN A MONOCYLINDRICAL DIESEL ENGINETutunea DRAGOS, Bica MARINAbstract: Biodiesel is a renewable, alternative diesel fuel of domestic origin derived from a variety of fats and oilsby a transesterification reaction; thus, it consists of the alkyl esters, usually methyl esters, of the fatty acids of theparent oil or fat. An advantage of biodiesel is its potential to significantly reduce most regulated exhaust emissions,including particulate matter (PM), with the exception of nitrogen oxides (NO x ). In this work, two types of biodiesel andtheir blends with petrodiesel were selected for exhaust emissions testing in a monocylinder diesel engine. The exhaustemission of biodiesel blends (CO, CO 2 , HC) were compared to normal petrodiesel. The emissions follow trendsestablished by previous research.Keywords: biodiesel, petrodiesel , exhaust emissions ,diesel engine.SMAT2008E21ANALYSIS OF NOISE LEVEL INTO A MONOCYLINDRICAL DIESELENGINE WHEN IS FUELED WITH DIFFERENT BLENDS OF BIODIESELAND PETRODIESELTutunea DRAGOS, Bica MARINAbstract: In this paper we analyzed the performance of different blens of biodiesel and petrodiesel on amonocylindrical diesel engine. Biodiesel reduces the classic diesel engine "knocking" noise. Biodiesel has a highercetane number, which means that biodiesel fuel will ignite more easily in a diesel engine while alsoreducing engine noise. Common first impressions when using a high-ratio blend of biodiesel include reduced enginenoise and a smoother engine. For this we use two type of fuel at different blends measuring the level of noise in fourdistinct points at 1 m of the engine with a sonometerKeywords: noise, ,biodiesel, petrodiesel, sonometer, cetan number;51