DISADVANTAGES OF BIODIESEL:
A) Energy required to produce Biodiesel and ethanol is high per unit of energy they produce by burning.
B) Calorific value of bio diesel is less. Hence large quantities of oil is required. So the pollution caused is higher than the normal diesel oil. Hence with view of emissions biodiesel is not a clean substitute of the petroleum. More over presently the cost o production and selling is higher than the petroleum. Presence of high unsaturated hydrocarbons can cause low octane number.
C) Flash point Is high so it can’t be ignited at normal temperatures. Clouding is a serious issue of the biodiesel, which at low temperatures produces gel like substance, clogging the engine and damaging their components.