Abstract
The effect of oil film on unburned hydrocarbon (HC) emissions from a spark ignition engine was investigated. a lubricant free piston ring and cylinder were employed to study the interaction between the fuel and cylinder lubricating oil film. Absorption and desorption of fuel vapor into and from the cylinder lubricating oil film was found to account for about 2530 percent of the total unburned HC emissions. The time-resolved lapse of the various species of combustion gas and unburned HC in the combustion chamber and exhaust port were also studied during the combustion, expansion and exhaust processes by means of high speed gas sampling valves. An increase in the amount of unburned HC in the combustion chamber was detected in the expansion and exhaust processes.
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