the increase in the CO2 emissions when fuelling with the biodiesel
blends is that when fuelling with biodiesel there is more time for
converting the formed CO to CO2. The exhaust temperatures are
shown in Fig. 5 for the entire rpm band. As seen in the figure, an
increase in the biodiesel blend ratio resulted in a decrease in the
exhaust temperature, and these results are in agreement with
the effects mentioned above.