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Previous issue date: 2011-01-31 === The aim of this study was investigate the consolidation of the biodiesel fuel used in (a) engines of urban and intercity bus companies, (b) a stationary engine. It was necessary to investigate and analyze, technologically, if the biodiesel fuels were presenting troubleshooting relative to wear of parts lied to fuel and to evaluate the consumption fluctuations of this fuel. The urban and intercity bus companies, localized in Natal, Rio Grande do Norte state, Brazil, had 41 and 12 vehicles, respectively. It were analyzed datasheet of each one vehicle during three years, since 2008 until 2010 and were interviewed the management of the maintenance team of bus companies relative to aspects concerning the substitution of the diesel fuel by the B5 biodiesel. The second aim of this study was visually inspect the wear of the parts directly lied to combustion process. For this reason, it was investigated a stationary engine, manufactured by Branco BD5, 5 HP of power, fueled by (a) diesel, (b) biodiesel B5, (c) biodiesel B20 and (d) diesel or biodiesel, both contaminated by distilled water. In this engine, its power utilizing biodiesel B5 versus diesel was lower about 5.2% and, in the investigated case of B20 versus diesel, it was lower around 11.5% === Investigou-se a consolida??o do uso do biodiesel em (a) motores de duas frotas de ?nibus, uma urbana e uma intermunicipal e (b) um motor estacion?rio. Entende-se serem necess?rios estudos para se observar, do ponto de vista tecnol?gico, se o uso do biodiesel apresenta problemas quanto ao desgaste das pe?as diretamente envolvidas com o combust?vel e tamb?m observar as flutua??es, para mais ou para menos, do consumo espec?fico desse combust?vel.
As frotas de ?nibus urbana e intermunicipal, sediadas em Natal RN - Brasil, possu?am 41 e 13 ve?culos, respectivamente. Foram analisadas as planilhas de cada ve?culo no per?odo de tr?s anos, de 2008 a 2010 e entrevistados os respons?veis pela manuten??o e condu??o da frota para observar os relatos dos mesmos quanto aos aspectos resultantes da substitui??o do ?leo diesel pelo B5. O segundo objetivo deste estudo foi inspecionar visualmente o desgaste das pe?as diretamente envolvidas no processo da combust?o. Para isso, utilizou-se um motor estacion?rio da marca Branco BD5, pot?ncia de 5 CV, abastecido por (a) diesel, (b) biodiesel B5, (c) biodiesel B20 e (d) diesel ou biodiesel contaminado com ?gua destilada. Nesse motor, sua pot?ncia utilizando B5 versus diesel demonstrou ser inferior em 5,2% e, no caso investigado de B20 versus diesel, inferior em 11,5%
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