Influence of Qualities of Low Grade Fuels on Soot, Deposit, Ring Wear and Others

Abstract

A small sized, high speed, direct injection, naturally aspirated Diesel engine and eight kinds of fuel have been used to investigate the influence of fuel qualities on soot, deposit, piston ring wear and deterioration of lube oil. A 30 hours running test of the Diesel engine was carried out for each fuel. Main items measured included soot emission rate, smoke density, deposit on combustion chamber wall and the vicinity, piston ring wear, n-pentane insoluble in lube oil, total base number of lube oil and viscosity of lube oil. The test results indicated that soot emission rate increased with the increase of carbon residue and sulfur content in fuel oil, and that high soot emission rate promoted piston ring wear and deterioration of lube oil, and that high sulfur fuel oil lowered rapidly total base number of lube oil.