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RESUMEN en los ultimos siglos, el hombre se ha visto obligado a recurrir a diversas fuentes para garantizar sus necesidades energeticas. es por esto, que a traves de los anos ha desarrollado tecnologias para explotar los combustibles fosiles, sin tener en cuenta el deterioro generado en el medio ambiente. esta explotacion indiscriminada ha llevado a los recursos naturales al borde de su agotamiento, lo cual ha impulsado el estudio de alternativas energeticas “amigables” con el medio ambiente. en este sentido, los biocombustibles se presentan como una alternativa viable a los combustibles fosiles. Este articulo esta enfocado en el estudio de los biocombustibles liquidos (bioetanol y biodiesel) por medio de una revision bibliografi ca detallada con el proposito de establecer el estado actual de esta tecnologia en Colombia. ademas, se han estudiado los impactos que su uso genera en los motores de combustion interna, especifi camente los de ciclo Otto y Diesel. Palabras clave: energia renovable, Biocombustibles, Bioetanol, Biodiesel, Motores. Liquid biofuels in colombia and its impact on internal combustion engines. A review ABSTRACT in the last centuries, the human being has been forced to use different sources in order to guarantee his energetic demand. it is for this reason that through the time technologies to exploiting fossil fuels have been developed, without taking into account the environment deterioration. furthermore, this indiscriminate exploitation has brought natural resources to their depletion. these factors have promoted the study of energies environmentally “friendly”. in this sense, biofuels seem to be a viable alternative to fossil fuels. this article is focused on the study of liquid biofuels in Colombia (bioethanol and biodiesel) by means of a detailed bibliographic revision. it is done to establish the state of the art of this technology. Moreover, the consequences of using them in internal combustion engines, particularly on those based on Otto and Diesel principles, are assessed. Keywords: Renewable energy, Biofuels, Bioethanol, Biodiesel, engines.

BIOCOMBUSTIBLES LÍQUIDOS EN COLOMBIA Y SU IMPACTO EN MOTORES DE COMBUSTIÓN INTERNA. UNA REVISIÓN