Although the fuel characteristics of biodiesels have been made similar to those of diesel fuel by various methods like transesterification,the viscosity values of biodiesels are still higher than
that of diesel fuel. To eliminate this negative effect, biodiesel is introduced to the combustion chamber after heating and thus can be used in diesel engines more efficiently. However, because
insulation of the combustion chamber elements causes an aftercombustion temperature increase in ceramic-coated diesel engines,