For different types of vegetable oils of Turkish origin (sunflower, co
rn, soybean, and olive oil) were blended with grade No. 2-D diesel fue
l at a ratio of 20/80 (v/v). The effect of the compression ratio on ex
haust emissions is investigated in an American Society for Testing and
Materials (ASTM)-cooperative fuel research (CFR) engine working with
the mentioned fuel blends and a baseline diesel fuel. A decrease in so
ot, CO, CO2, and HC emissions and an increase in NOx emissions have be
en observed for fuel blends compared to diesel fuel.