COMPARATIVE PERFORMANCE OF DIFFERENT VERSIONS OF LOW HEAT REJECTION DIESEL ENGINES WITH MOHR OIL BASED BIO- DIESEL

Experiments were carried out to evaluate the performance of a low heat rejection (LHR) diesel engine consisting of different versions such as ceramic coated cylinder head engine-LHR-1; Air gap insulated piston and air gap insulated liner-LHR-2; and Ceramic coated cylinder head, air gap insulated piston and air gap insulated liner -LHR- 3 with normal temperature condition of mohr oil based biodiesel (MOBD) with varied injection pressure. Performance parameters and emission levels were determined at various magnitudes of brake mean effective pressure (BMEP). Combustion characteristics of the engine were measured at the peak load operation with TDC (top dead centre) encoder, pressure transducer, console and special pressure-crank angle software package. Conventional engine (CE) showed compatible performance and LHR engines showed improved performance at recommended injection timing of 27 o bTDC and recommend injection pressure of 190 bar with MOBD operation, when compared with CE with pure diesel operation. Peak brake thermal efficiency increased relatively by 7%, brake specific energy consumption decreased relatively by 3.5%, smoke levels decreased relatively by 11% and NOx levels increased relatively by 58% with LHR-3 engine with MOBD at an injection pressure of 190 bar when compared with pure diesel operation on CE at an injection pressure of 190 bar.