At full load the delay period of neat plastic
oil is 11 CA which is higher than all other fuels because of its
higher viscosity. The delay period for diesel at full load is 7 CA
and for blends it is 7.5 CA, 9.5 CA, 10 CA for PO25, PO50 and
PO75 respectively. The lower cetane number and higher viscosity
of the blends results in poor atomization which in turn affects
the proper mixing of air and fuel increasing the delay period. The
gas temperature inside the combustion chamber increases at
higher loads, as more fuel is injected to get the extra power
required. The higher temperature increases the vaporization of fuel
resulting in the reduction of delay period as indicated in