Figure 5 and figure 6 represent the variations of brake
specific fuel consumption (BSFC) with brake power for
all fuels at without and with EGR condition respectively.
For all fuel blends, BSFC is found to be decrease with
increase in load. This is due to the higher percentage
increase in brake power with load as compared to the
increase in fuel consumption. Using B10, BSFC of the
engine is lower than that of diesel for all loads and for
B15, BSFC almost same. In general the BSFC is found
to be greater with biodiesel because of its lower
calorific value. It is noticed from the figures that, with
EGR condition reduces the BSFC. It could be the effect
of re-burning of charge, increase of intake charge
temperature which increases the combustion velocity.