Investigations on Performance Parameters with Medium Grade Low Heat Rejection Combustion Chamber Rice Brawn Oil Biodiesel

Experiments were carried out to evaluate the performance of diesel engine with medium grade low heat rejection (LHR) combustion chamber with rice brawn oil based biodiesel (ERBO) with varied injection timing and injector opening pressure. Performance parameters were determined at various values of brake mean effective pressure (BMEP) of the engine and compared with conventional engine with biodiesel operation at similar operating conditions. Biodiesel showed compatible performance with conventional engine (CE), while LHR combustion chamber improved the performance in comparison with pure diesel operation at similar operating conditions. The optimum injection timing was found to be 31obTDC with CE while it was 29obTDC for medium grade LHR combustion chamber with biodiesel operation. Relatively, with LHR combustion chamber with biodiesel operation, peak brake thermal efficiency was comparable, at full load operation- brake specific energy consumption was comparable, exhaust gas temperature decreased by 65oC, coolant load decreased by 6%, and volumetric efficiency was comparable in comparison with pure diesel operation at similar operating conditions.