NPR SWH30373-2 Piston Ring Set 81.50mm 0.020" Oversize Honda B-Series DOHC

The NPR SWH30373-2 is a premium piston ring set designed for Honda and Acura B-Series DOHC engines. This set is manufactured by NPR of America (Nippon Piston Ring Co., Ltd.), a leading Japanese manufacturer known for high-quality engine components since 1973.

Key Specifications:

• Bore Size: 81.50mm (0.020" / 0.50mm oversize)
• Ring Dimensions: 1.0mm x 1.2mm x 2.8mm (compression rings and oil ring)
• Material: Premium steel construction with chrome finish
• Complete set includes rings for 4 cylinders
• OEM Reference: 13011-PR3-004
• Made in Japan

Advanced Steel Ring Technology:

NPR steel piston rings offer superior performance compared to traditional cast iron rings. The high-alloy steel construction provides reduced radial wall thickness while maintaining exceptional strength, resulting in better conformability to cylinder walls and improved sealing. These rings feature enhanced wear resistance, lasting up to 50% longer than conventional rings while reducing oil consumption by over 30%.

Features and Benefits:

• Precision-engineered for exact fit and optimal compression sealing
• Reduced friction and wear for extended engine life
• Excellent heat and wear resistance for demanding conditions
• Minimizes blow-by and oil consumption
• OE-specification quality for reliable performance

This oversize ring set is ideal for engine rebuilds requiring bore machining. NPR rings are trusted by professional engine builders worldwide for their exceptional quality and performance reliability.