Manley 47865-1 Premium Steel Piston Ring Set 86.5mm Bore Single Cylinder

The Manley 47865-1 is a single-cylinder Premium Steel piston ring set featuring an 86.5mm bore diameter and ring widths of 1.0mm (top) x 1.2mm (second) x 2.8mm (oil). Designed for high-performance and forced induction applications, this file-fit ring set is engineered to deliver superior sealing, reduced oil consumption, and long-lasting durability under demanding conditions.

These rings are built around Manley's proven Premium Steel top ring construction, which is optimized for high-horsepower, turbocharged, supercharged, and nitrous-assisted engine builds. The Napier-style second ring provides improved oil control compared to a conventional taper-face ring, while the 3-piece oil ring assembly delivers precise oil management.

Key Features:

• 86.5mm bore diameter — precision-sized for exact fitment
• Ring widths: 1.0mm top ring / 1.2mm second ring / 2.8mm oil ring
• File fit design — allows end-gap tuning for specific performance requirements
• Napier-style second ring — enhanced oil control and sealing efficiency
• Premium Steel construction — ideal for forced induction and high-horsepower builds
• Oil ring tension: 7–10 lbs. — optimized balance of oil control and ring drag

Manley Performance has been a trusted name in high-performance engine internals since 1966, supplying components to professional race teams and OEM manufacturers worldwide. The 47865-1 is the single-cylinder version of the 47865-6 full set, making it ideal for replacement of individual ring sets or custom build applications.