The total hydrocarbon (HC) emissions and the distribution of hydrocarbon species from several different piston and cylinder liner configurations were compared against those from the standard piston for this engine. Reductions in total HC emissions were observed for each design variant, top land crevice volumes and cylinder liner surface finish achieved the most significant reductions. The variations between the relative quantities of a selection of the most significant HC species were investigated for each design and showed considerable differences between each test.
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