Available online at www.academicpaper.org Academic @ Paper ISSN 2146-9067 International Journal of Automotive Engineering and Technologies Vol. 2, Issue 4, pp. 104 – 110, 2013 Original Research Article Effect of cottonseed oil methyl ester on the performance and exhaust emissions of a vehicle Ali Kahraman 1 , Hidayet Oguz 2 , Ilker Ors 3* , Ozgur Solmaz 4 1 Selcuk University, Faculty of Technology, Mechanical Engineering Department, 42003, Konya, Turkey 2 Necmettin Erbakan University, Faculty of Engineering and Architecture, 42060, Konya, Turkey 3 Aksaray University, Aksaray Technical Sciences Vocational High School, 68100, Aksaray, Turkey 4 Selcuk University, Faculty of Technical Education, Mechanical Education Department, 42003, Konya, Turkey Received 22 April 2013; Accepted 23 July 2013 ABSTRACT The present work investigates the impact on vehicle performance and exhaust emissions from vehicle when using 100% diesel with petroleum origin (fossil diesel), compared to a mixture of 2-5- 100% cottonseed oil methyl ester (COME) in fossil diesel fuel (B2, B5, B100). For the accomplishment of this work an assessment was made using some primary tests on a chassis dynamometer, measuring vehicle performance and emissions. The results demonstrate that the use of biodiesel has a negative effect on vehicle's performance. The increase in average fuel consumption was approximately 1.44 fold for usage of B2, B5 and B100 at forth gear. According to results of exhaust emissions from vehicle, the decrease in average CO emission was approx. 47.2% for usage of B100. Keywords: Cottonseed oil methyl ester; Vehicle performance; Exhaust pollutant emissions. *Corresponding author Tel: +90 382 288 25 03; fax: +90 382 215 31 51 E-mail address: ilkerors@hotmail.com