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Neat castor oil poses problems when used in CI engine. Problems are reduced to minimum by subjecting the castor oil to transesterification. Castor oil was converted to bio diesel and blended by 5%, 10%, 15% and 20% in quantity (by volume) with high-speed mineral diesel (HSD) fuel. This fuel was used on a single-cylinder compression-ignition, four-stroke diesel engine. The blended fuel gave lower emissions of CO but resulted in higher values of CO2 and NOx. Results showed that engine brake power, thermal efficiency for blended bio diesel fuel were lower than pure mineral diesel, because of lower calorific value of blended fuel. The maximum value of thermal efficiency was observed at 13% substitution of castor oil methyl ester [CME] in diesel. However, higher engine exhaust temperatures were obtained with blended fuel in comparison with that of pure mineral diesel. Chi square (X2) statistical test was applied. The value for 2 (CME) 0.0524 was observed. The value concluded that there is no effect of fuel type on fuel consumption within the given range. Overall castor oil bio diesel blends fared well in terms of engine performance.  Ozet: Saf hintyagi out CI (sikistirma ateslemeli) motorlarda sorunlara neden olmaktadir. Sorunlar hintyagi otunun transesterifikasyona tabi tutulmasi ile en aza indirilmektedir. Hintyagi otu biyodizele donusturulmustur ve (hacimsel olarak) %5, %10, %15 ve %20 oranlarinda yuksek hizlara uygun mineral katkili dizel yakita (HSD) karistirilmistir. Bu yakit tek silindirli sikistirma ateslemeli, dort zamanli bir dizel motorda kullanilmistir. Karistirilan yakit daha dusuk CO salinimlari saglamis fakat daha yuksek CO2 ve NOx salinimlarina neden olmustur. Sonuclar karisim yakitin dusuk kalorifik degerinden dolayi motor termal veriminin ve motor dinamometre gucunun karisim biyodizel yakiti icin saf mineral katkili dizel yakita gore daha dusuk oldugunu gostermistir. Termal verimin maksimum degeri %13 hintyagi otu metil esteri [CME] katkisi ile gozlemlenmistir. Fakat saf mineral katkili dizel yakit ile kiyaslandiginda karisim yakitta daha yuksek motor egzoz sicakliklari elde edilmistir. 2 (CME) 0.0524 gozlemlenmistir. Chi  degerinin karesi (X2) istatistiksel testi uygulanmistir.  degeri icin verilen aralikta yakit tuketiminin uzerine yakit turunun etkisi olmadigi sonucuna varilmistir. Genel olarak hintyagi otu biyodizeli ile yapilan yakit karisimlari motor performansi acisindan iyi bir performans gostermistir.

Performance of single-cylinder compression ignition engine with indigenous castor oil bio diesel