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Wear254(2003)1281–1288Effectsofrefinedpalmoil(RPO)fuelonwearofdieselenginecomponentsSurapolRaadnui∗,AnantMeenakMachineryHealthMonitoringandTribologyLaboratory,DepartmentofProductionEngineering,FacultyofEngineering,KingMongkut’sInstituteofTechnologyNorthBangkok,1518PibulsongkramRoad,Bang-Sue,Bangkok10800,ThailandReceived3September2002;accepted6January2003AbstractInthisparticularresearchwork,theeffectsofrefinedpalmoil(RPO),asalternativefuel,onwearofdieselenginecomponentsareassessed.Fleettestingiscarriedforthequalifyingcandidatesdieselfuelreplacement,i.e.100%RPOfuelor50%RPOand50%conventionaldieselfuelmixture.Thebaselineofthefleettestingisusingpureconventionalpetroleumdieselfuelasanenergysourceinoneofthetestedvehiclesinthefleet.Analysisofusedenginelubricationoil,takenwhentheoilwaschangedonthevehicles,wascomparedtotheanalysisofusedoilsamplespulledfrom100%dieselfuelengines.ThefindingsuggestedthatthepureRPOandRPOblendedfueledengineswerewearingatanormalrate.©2003ElsevierScienceB.V.Allrightsreserved.Keywords:Dieselenginewear;Palmoilfuel1.Introductionexcessiveinjectorcokingoriginallyreportedwitheitherraworrefinedvegetableoilhasnotbeenconclusivelyproved.Asthedieselfuelpricecontinuestorise,theneedtoWiththisbackground,theKingMongkut’sInstituteofTech-developmoreadvancedoralternativedieselfuelbecomesnologyNorthBangkok(KMITNB),Thailandhasconductedmoreimportant.RPOfuelisproposedasitcanbeproducedsomelimitedstudiestoevaluateRPOfuelsincomparisondomesticallyfromabundantpalmoilresources.Severallo-with100%petroleumdieselfuelsforlightheavy-dutydieselcallegislativemeasureshavebeenpassedpromotingthein-vehicles.Forthiswork,acomparisonwasmadebetweenacreasedusedofRPOasdieselfuelreplacement.Aninitial100%conventionalpetroleumdieselfuel,a50%RPOandstudiesused100%rawvegetableoilresultinginincomplete50%dieselfuelanda100%RPO.combustion,causingsevereenginedeposits,ringsticking,injectorcoking,contaminationtotheengineoil,andin-evitably,toenginefailure[1].Aftertheseinitiativetes
