NPR SWH30365-4 Piston Ring Set Oversize Honda Acura D-Series Engine

The NPR SWH30365-4 is a premium piston ring set manufactured in Japan by NPR (Nippon Piston Ring Company), designed for Honda and Acura D-series engines requiring oversize rings. This complete ring set includes rings for four cylinders and is engineered for engines that have been bored oversize during rebuild operations.

Key Features:

• Manufactured in Japan from premium steel material for superior durability and wear resistance
• Precision-engineered design provides optimal sealing, reduced oil consumption, and improved compression
• Oversize specification for rebored engine blocks
• Ring widths: 1.20mm (top compression), 1.50mm (second compression), 2.80mm (oil control)
• Includes complete ring set for 4 cylinders
• Steel construction offers 50% longer service life compared to cast iron rings
• Excellent heat resistance for demanding performance conditions
• Minimizes friction and reduces wear to extend engine component lifespan

NPR of America has been supplying Original Equipment Manufacturers including Toyota and Lexus, as well as the automotive aftermarket, with the highest quality internal combustion engine parts since 1973. NPR piston rings are precision-manufactured to meet strict Japanese Industrial Standards (JIS B8032-6-1998) and are trusted by professional engine builders worldwide.