A compression piston ring which is L-shaped when viewed from the end. When installed in the piston , the horizontal part fits more deeply in the piston groove while the vertical side rubs against the cylinder wall. This style of ring gives good sealing and prevents piston-ring flutter during acceleration and deceleration of the piston.
DYKES RING
Meaning of DYKES RING in English
English dictionary of automotive terms. Английский словарь автомобильных терминов. 2012