As an attempt to suggest an alternate fuel for diesel with less emission, the effects of Diesel-hexanol blends, blended in different percentage ranging from 10%-50% by volume were experimentally investigated on a singlecylinder, water-cooled, direct injection diesel engine developing a power output of 5.2 kW at 1500 rev/min and the results show improved performance with blends compared to neat fuel with substantial reductions in smoke and increase of NOx emissions. Combustion analysis show peak pressure and rate of pressure rise were increased with increase in hexanol. For this reason it is examined the use of hot exhaust gas recirculation (EGR) to control NOx emissions. From the analysis of experimental findings it is revealed the use of EGR causes a sharp reduction of NOx with a slight reduction of engine efficiency which in any case does not alter the benefits obtained from the oxygenated fuel

1,4 dioxane, a new ad di tive al lows the splash blend ing of eth a nol in die sel in a clearso lu tion. The ob jec tive of this in ves ti ga tion is to first cre ate a sta ble eth a nol-die sel blended fuel with 10% 1,4 dioxane ad di tive, and then to gen er ate per for mance, com bus tion and emis sions data for eval u a tion of dif fer ent eth a nol con tent on a single cyl in der die sel en gine with and with out ther mal bar rier coat ing. Re sults show im proved per for mance with blends com pared to neat fuel for all condi tions of the en gine. Dras tic re duc tion in smoke den sity is found with the blends as com pared to neat die sel and the re duc tion is still better for coated en gine. NO x emis sions were found to be high for coated en gines than the nor mal en gine for the blends. The ox y gen en riched fuel in creases the peak pres sure and rate of pres sure rise with in crease in eth a nol ra tio and is still su pe rior for coated en gine. Heat release pat tern shows higher pre mixed com bus tion rate with the blends. Lon ger ig nition de lay and shorter com bus tion du ra tion are found with all blends than neat diesel fuel.