NPR SWH30373-1 Piston Ring Set 81.25mm Oversize Honda Acura B-Series DOHC

The NPR SWH30373-1 is a premium quality piston ring set designed for Honda and Acura B-Series DOHC engines. This set features a piston diameter of 81mm with ring dimensions of 1.0mm x 1.2mm x 2.8mm, and the -1 suffix indicates a 0.25mm (0.010 inch) oversize bore. Manufactured in Japan, these rings are engineered to meet the demanding requirements of high-performance engine rebuilds.

Key Features:

• Complete set includes rings for 4 pistons
• Oversize: 0.25mm (0.010 inch) for machined cylinders
• Standard bore diameter: 81.25mm total (81mm base + 0.25mm oversize)
• Ring widths: 1.0mm x 1.2mm x 2.8mm
• Premium steel construction for enhanced durability
• OEM replacement quality - replaces Honda part number 13011-PR3-004

Application:

Compatible with Honda and Acura B-Series engines including B17A1, B18C5, B18C1, B18A1, and B18B1. These engines are commonly found in Acura Integra models from 1990-2001 and various Honda Civic applications. This oversize ring set is specifically designed for engines that have been bored 0.25mm oversize during rebuilding or cylinder repair.

NPR Quality:

NPR (Nippon Piston Ring) has been a trusted supplier to Original Equipment Manufacturers and the automotive aftermarket since 1973. These piston rings are meticulously crafted in Japan and engineered with cutting-edge technology, guaranteeing unparalleled quality and outstanding durability. NPR rings feature advanced materials and surface treatments to minimize friction, reduce wear, and ensure optimal engine protection under demanding operating conditions.