A modeling for absorption/desorption of the fuel in the oil film has been d
eveloped. The effect of oil film on fuel absorption/desorption was investig
ated according to engine speed, load, and mean oil film temperature. Multi-
component fuel was employed to quantify the oil film effect. The results sh
owed that Henry's constant, which is related to solubility, is the most dom
inant parameter in absorption/desorption mechanism of the fuel into oil fil
m. The oil segments close to the top of the cylinder liner have significant
contribution to the fuel absorption and desorption process than other oil
segments. At warm-up condition, engine speed has a little influence on the
amount of fuel absorbed/desorbed. However, when the oil film temperature is
low, the quantity of fuel absorbed/desorbed decreases with the increasing
engine speed. The amount of fuel trapped in piston crevice is 2 to 2.3 time
s as large as that of fuel in the oil film. However, the fuel trapped in th
e oil film desorbs slower into the combustion chamber than that escaped fro
m the piston crevices at the cold engine condition.