Abstract

iF-PART I Simultaneous Laser Induced Fluorescence (LIF) and Sulfur dioxide (SO2) testing was performed on the Chrysler 2.2L Spark Ignition engine. The objective of the experiment was to investigate how oil film thickness on both the lands and rings of the piston changed with engine speed and to relate this with a change in oil consumption as derived from the SO2 data. The laser accessed the cylinder liner of the no. 4 cylinder through a quartz window. Real-time SO2 based oil consumption diagnostic equipment was adapted to the Chrysler Engine. The exhaust from the no. 4 cylinder was sampled just downstream of the exhaust port. The piston rings were unpinned rings in this experiment. Analysis of the LIF data revealed that lubricant is present on the crown land during firing conditions and that second land oil film thickness data indicates an oil transition from the region just above the second ring to the region immediately below the compression ring. Analysis of the SO2 data revealed considerable variability in oil consumption values for the three engine