In load Vs HC graph(shown in figure 5) , HC emission is maximum
when 16° spark angle BTDC and 90° ATDC of SOI followed
by 20° spark angle BTDC and 150° ATDC SOI and 18°
spark angle BTDC and 120° ATDC SOI release minimum HC .
Similarly case of brake power Vs HC 160° spark angle BTDC
and 90° ATDC SOI release maximum amount of HC followed
by 20°, 16°spark angle of BTDC respectively. But, as the brake
power increase irrespective of spark angle and ATDC SOI
emission is almost same. Table 2 gives the Observation table
for different load conditions. Figure 6shows the hydrocarbon
against brake power