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Fluctuating fuel prices and associated pollution problems of largely  exploited petroleum liquid fuel has stimulated the research on abundantly  available gaseous fuels to keep the mobility industry intact. In the present  work an air cooled diesel engine was modified suitably into a spark ignition  engine incorporating electronic ignition and variable speed dependant spark  timing to accommodate both LPG and CNG as fuels. Engine was optimized for  stoichiometric operation on engine dynamometer. Materials of a few intricate  engine components were replaced to suit LPG and CNG application. Ignition  timing was mapped to work with gaseous fuels for different speeds.  Compensation was done for recovering volumetric efficiency when operated with  CNG by introducing more volume of air through resonator. Ignition timing was  observed to be the pertinent parameter in achieving good performance with  gaseous fuels under consideration. Performance and emission tests were  carried out on engine dynamometer and chassis dynamometer. Under wide open  throttle and at rated speed condition, it was observed that the peak pressure  with LPG was lying between diesel fuel and CNG fuel operation due to slow  burning nature of gaseous fuels. As compression ratio was maintained same for  LPG and CNG fuel operation, low CO emissions were observed with LPG where as  HC + NOx emissions were lower with CNG fuel operation. Chassis dynamometer  based emission tests yielded lower CO2 levels with CNG operation.

Conversion of diesel engine into spark ignition engine to work with CNG and LPG fuels for meeting new emission norms