Injector-fouling propensity of certain vegetable oils and derivatives as fuels for diesel engines

Abstract

The results of experiments specifically designed to study the propensity for certain vegetable oil candidates as fuels to foul the injectors of representative farm-type diesel engines are presented. The search for an expedient means of reproducing the injector-coking problem led to choice of linseed oil which has produced drastic effects in DI engines, tending to foul the injectors and cause ring-sticking in less than ten hours. Short and long-term engine test data are presented and the authors' current experiences in use of vegetable oils or their derivatives as diesel engine fuels are outlined. Viscosity is no longer indicated as the sole cause of coking. Esters are reconfirmed as good fuel candidates. 4 figures, 2 tables.