Presence of smoke in diesel engine exhaust is an indication of poor combustion due to
several factors. Nevertheless, with an ever increasing concern for the impact of air pollution
on environment, animal and plant life, vehicle exhaust emissions, particularly due to road
transport, have, in recent years been subjected to increasingly stringent regulations. The
environmental pollution can be controlled by utilization of clean fuel such as CNG
(Compressed Natural Gas). The present work was carried out on a 7.35 kW four-stroke, twin …