The intensifying demand of cleaner fuelled vehicles considering current norms of BSIV and upcoming stringent norms of BSVI with low cost solutions has promoted the development of CNG and dual fuel vehicles. CNG vehicle is anticipated to discover its extensive use for environment fortification and effective deployment of energy capitals. Thus, CNG vehicles can be pretty effective in averting environment deterioration. CNG has low carbon to hydrogen ratio, this leads to very low CO2 emissions compared to gasoline and diesel vehicles. CNG engines have the potential of low NOx and particulate emissions. Natural gas vehicle development has been directed on the way to current use of direct injection and port injection with S.I. engines. Generally for low cost development, all OEMs prefer optimization of existing engines. Similarly for this project, a diesel engine was converted to S.I. engine for development of low emission CNG engine. All required changes from diesel to CNG engine have been elaborated in this paper.
For optimization of an S.I. engine with port injection, it is vital to understand the combustion propagation. This paper gives the complete insight of CNG fuelled turbocharged engine development with detailed discussion on fuel injection strategies and lambda control for best catalyst efficiency. Further, Emission optimization and exhaust temperature control strategies have been discussed for better understanding of emission development and misfire control. Complete hardware range: spark plug, injector, turbocharger and catalyst selection has been discussed for best engine optimization. The result of this study can contribute some vibrant knowledge for the design and development of S.I. port injection CNG engine.