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Your cart is empty.A piston ring must have both spring-like tension and the properties to become a true circle when closed. NPR's piston rings serve to seal combustion gas, control lubricating oil, dissipate heat, and prevent wear and seizure under the severe conditions of operation. Now that engines are required to be more compact, lighter, and more sophisticated in performance, the choice of piston ring materials has been widened to include steel in addition to the traditional cast iron. Moreover, in order to enhance their wear resistance and durability, the rings also undergo various surface treatments including nitriding and PVD treatment.
Brandon
Reviewed in the United States on October 14, 2021
So far have found no issues since replacing my rings.
shota
Reviewed in the United States on October 11, 2017
👍
Adam
Reviewed in the United States on September 18, 2015
If you're rebuilding an imported engine, this is the ring to use. Even after an extensive hone, every ring's ring gap came back bang-on factory in every cylinder. Make note of the markings on each ring so you get the profile correct on install. Rings seated quickly - easy starts and consistent idle achieved after a quick break-in of 10 min@3,500 RPM.
Tommy D.
Reviewed in the United States on April 8, 2015
As an ASE certified mechanic, I strongly recommend NPR. Each ring is clearly marked for proper installation. Composition is excellent. Three critical points to note during an engine rebuild. 1. Be sure to properly deglaze cylinder walls. (A well oiled, properly sized flex hone is preferable) 2. Be extra fussy cleaning cylinders after deglazing. 3. Do not use synthetic oil or additives during break in period. I have rebuilt many engines using these rings with great success.
barry
Reviewed in the United States on November 11, 2014
fast
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