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What are PC rings or flame rings or fire rings or anti polishing ring or carbon cutting ring/ where the removed carbon goes?

Piston cleaning rings:
incorporated in the top of the cylinder liner,has a smaller inner diameter than the liner hence scraps off ash and carbon deposited in the piston top land. Otherwise these deposits might wipe off injected lubricant.Deposits can also result in liner polishing deteriorating the optimum cylinder conditions.
Removed carbon is washed away by the cylinder lube oil.
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