Author : Pankaj S. Pawar and Sameer Y. Bhosale

The world is having two crisis of environmental pollution and fossil fuel depletion. Use of alternative fuels is good solution for low exhaust emissions. Development of alternatively fuelled engines has become important to meet the stringent emission norms being implemented globally. CNG is better alternative fuel for automotive sector to reduce demand of petrol and diesel. Engine power is proportional to the amount of air and fuel that can get into the cylinders. The power of a CNG engine can be increased by installing turbocharger. In this work a base naturally aspirated SI engine (which is converted from CI to SI) is converted to a TC intercooled natural gas engine. BorgWarner make turbocharger is selected from compressor maps with the help of a mathematical model giving pressure ratio and air flow rate of compressor. The power of engine is increased to 83kW from 70kW at rated speed of 3400rpm. Also maximum torque is increased from 205Nm to 242Nm in between 1400-2000rpm. BSFC is reduced to 210 gr/kWh along with improvement in volumetric efficiency. Use of 3-way Catcon improved emission levels significantly .

Keywords: CNG, Turbocharger, Compressor map, Torque, Power, BSFC.