Browse Publications Technical Papers 2011-36-0157

Ring Pack for Downsized Spark Ignition Engines 2011-36-0157

Downsized engines are considered one major technical trend to attend the demands for CO₂ and fuel consumption reduction. Usually this engine configuration consists of displacements between 0.9L and 1.2L with 3 or 4 cylinders, usually associated with turbo charge. The increased load due to high gas pressures and power density may affect the PCU components, specially the piston rings.
This work reviews the ring pack used on the current downsized engines from European and NAFTA OEMs. The different ring designs and materials used on downsized engines are discussed. The specific challenges that those engines present to piston rings and the available alternatives are discussed.
An extreme low friction, under development, ring pack was tested in a 1.2L Turbo downsized engine. With low friction, a low tangential force ring pack, the main issue was control of Lube Oil Consumption. The use of an innovative Oil Control Ring design enable the ring pack to present similar levels of Lube Oil Consumption than the current production with almost 60% reduction on the ring pack load.


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