There are two major causes of formation of CO emission, the first one is the incomplete combustion due to insufficient
amount of oxygen supplied in combustion chamber and the second one is the poor mixture formation. The variation of CO
emission of the engine with DF and dual fuel mode is depicted in Fig. 5. With increase in load, an increase in CO emission
is observed with Diesel and Diesel with producer gas in dual fuel mode. Much higher values of CO emission are recorded in
dual fuel mode as compared to Diesel mode. The higher concentration of CO emission in the dual fuel mode is due to
incomplete combustion. The mixture of high temperature producer gas and air flow to the engine reduces the amount of
oxygen required for complete combustion. This creates incomplete combustion and increases the CO emission.