studied the performance and
exhaust emissions of a Diesel engine using preheated waste
frying oil as fuel. The properties of waste frying oil, such as
viscosity, density, calorific value and flash point, were
determined. The effect of temperature on the viscosity of
waste frying oil was evaluated. It was determined that the
waste frying oil requires a heating temperature of 135 C
to reduce its viscosity to that of Diesel at 30 C. The performance
and exhaust emissions of a single-cylinder Diesel
engine were evaluated using Diesel, waste frying oil (without
preheating) and waste frying oil preheated to two different
inlet temperatures (75 and 135 C). The engine
performance was improved and the CO and smoke emissions
were reduced using preheated waste frying oil. It
was concluded from the results of the experimental investigation
that the waste frying oil preheated to 135 C could
be used as a Diesel fuel substitute for short term engine
operation