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Radially grooving the skirts (around the circumference of the piston, just below the ring groove, supposedly makes the oil sweep more effective, by giving the oil an area in which to be displaced from the cylinder wall.
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"¿ʞɐǝɹɟ ɐ ǝɹ,noʎ uǝɥʍ 'ʇı ʇ,usı 'ʎlǝuol s,ʇı"
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