Abstract
Biomass fuels or Biodiesel fuels are a viable alternative to petroleum fuels due to their renewability, low or no emission and the potential to provide energy security and local economic benefits. This paper presents the results of various oils being tested as diesel fuel alternatives, including coconut oil unblended and blended with diesel fuel. The effects on engine performance and efficiency, the corresponding problems associated with their use, the atomization characteristics in the process of spray formation, engine combustion and the mechanism of the effect is also discussed on the basis of emissions, combustion parameters and spray characteristics.