Regulate oil: Piston rings control oil on the cylinder wall surface to properly lubricate and cool the cylinders. Prevent oil burning: Rings keep oil in the crankcase and out of the combustion chamber to avoid burning oil. So in summary, valve seals and piston rings play a critical role in controlling oil flow, sealing the combustion process, maintaining compression, and regulating cylinder.. Factory hypereutectic aluminum pistons may be slightly harder than forged, but in a 100,000 mile engine, I guarantee you have at least .0005″ wear, and probably more. If the engine is torn down far enough to install rings and bearings, I’d install new pistons, as well. Unless youre going FI, or N2O, stock replacement hypereutectic pistons are fine.

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Piston Rings
Piston Rings Replacement Cost. The cost to replace your piston rings is between $1000 and $5000, depending on the car model and labor costs. The piston rings cost $40 to $200 depending on how many cylinders your car has. The labor work is between $1000 and $4000. Piston rings are small, but they are expensive to replace.. With a labor rate around $150-250 per hour, you can see how the labor cost adds up really quickly. The total cost to rebuild an engine and replace the piston rings will be anywhere from $3,000 to $6,000. Of course, this price range could be even higher if your engine is harder for the mechanic to access.