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JE Pistons Ring Sets 1.0-1.2-2.8-3.661

Name: JE Pistons 3.661 Bore Ring Set 1.0-1.2-2.8mm for 8 Cylinder Engines
SKU: jepJG1008-3661
Price: 311.61 USD
Availability: InStock

SKU: jepJG1008-3661

Original price was: $346.99.Current price is: $311.61.

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Category: Top Products

JE Pistons Ring Set — 3.661 in. Bore | 1.0-1.2-2.8mm | 8 Cylinder

Bore: 3.661 in. / 92.99 mm Ring Pack: 1.0mm Top / 1.2mm 2nd / 2.8mm Oil Application: 8 Cylinder Type: 3-Ring SetRing selection doesn't get talked about as much as pistons or camshafts, but it matters just as much. The rings are what actually seal combustion pressure against the cylinder wall. If your ring package isn't matched to your bore, your power application, and your engine's operating conditions, you're leaving performance on the table no matter what else is in the build.JE Pro Seal rings are the result of over 60 years of experience in manufacturing racing piston ring technology for NASCAR, ALMS, NHRA, and AMA competition. This isn't shelf stock engineered to a price point — it's a ring set built with the same technology that top professional teams have been relying on for decades.

Full Specification

Bore Diameter: 3.661 in. / 92.99 mm Ring Configuration: 3-Ring Cylinders: 8Top Ring:

Thickness: 0.0394 in. (1.0mm)
Axial Height: 1.00mm
Radial Width: 0.142 in.
Material: Carbon Steel
Facing: Nitride
Shape: Barrel Face, Back Cut, Neutral

Second Ring:

Thickness: 0.0472 in. (1.2mm)
Axial Height: 1.20mm
Radial Width: 0.158 in.
Material: Ductile Iron
Facing: Phosphate
Shape: Napier, Back Cut, Neutral

Oil Ring:

Thickness: 0.110 in. (2.8mm)
Axial Height: 2.80mm
Radial Width: 0.128 in.
Material: Carbon Steel
Facing: Carbon Steel
Shape: Flex Vent

What Each Ring Is Doing

Understanding the ring package helps you confirm this is the right set for your application.Top Ring — Nitride-Faced Carbon Steel, Barrel FaceThe top ring takes the brunt of combustion heat and pressure. The nitride facing on this ring is a surface hardening treatment that significantly increases wear resistance against the cylinder wall — particularly important in boosted applications, high-RPM builds, and anywhere combustion temperatures run high. The barrel face profile promotes quick ring seating and maintains a consistent oil film between the ring and cylinder wall. The back cut helps the ring twist slightly under combustion pressure, improving the seal against the bottom of the ring groove.Second Ring — Phosphate-Faced Ductile Iron, Napier ProfileThe second ring sets are taper-faced with a reverse torsional design and finished with a phosphate coating. The Napier profile on the second ring is specifically designed to scrape oil off the cylinder wall on the downstroke while assisting the top ring's sealing on the upstroke. Ductile iron provides better impact resistance and conformability than cast iron, which matters in the second groove where ring flex under load is more common. The phosphate coating reduces initial break-in wear.Oil Ring — Flex Vent Carbon SteelThe flex vent design in the oil control ring provides consistent radial pressure against the cylinder wall while allowing conformability across variations in bore geometry. Carbon steel construction gives it durability for long service intervals without becoming brittle at temperature extremes.

Why the Ring Dimensions Matter

This ring set uses a thin top ring at 1.0mm — thinner than traditional 1.5mm or even 1.2mm top rings common on older designs. Thinner rings have less mass, which means less friction and faster response to cylinder pressure changes. That translates to better power output and improved sealing at high RPM where inertia becomes a factor with heavier rings.The 1.2mm second ring follows the same philosophy. Thinner second rings work more effectively with the Napier profile to control oil without robbing power through excessive drag.The 2.8mm oil ring is the standard width for the oil control function at this bore size — wide enough to provide effective oil film control across the full stroke.

Who This Is For

Engine builders working on 8-cylinder applications with a 3.661-inch bore who need a precision ring set matched to their JE pistons or to any forged or cast piston requiring this ring specification.The 3.661 bore is common across several applications — Ford's 5.0L Coyote platform at various stages of build is a prime example — but this ring set covers any 8-cylinder engine that measures to this bore diameter and runs the 1.0/1.2/2.8mm ring package.These high-technology ring designs reduce friction, lower wear, improve ring seal, and extend ring life. For a street/strip build, a dedicated track car, or a forced induction application where combustion pressure and ring seal are critical, this is the right level of ring for the job.

Key Features

Nitride-faced top ring — Hardened surface treatment for superior wear resistance against the cylinder wall, especially in high-heat and boosted applications.Barrel face top ring profile — Promotes fast seating and consistent oil film maintenance between ring and bore.Napier second ring — Purpose-built profile for effective oil scraping and combustion sealing in combination with the top ring.Ductile iron second ring — Better conformability and impact resistance than cast iron for longer service life and consistent seal across varying cylinder conditions.Phosphate second ring coating — Reduces wear during initial engine break-in when ring-to-wall contact is highest.Flex vent oil ring — Consistent radial pressure and bore conformability for effective oil film control across the full stroke.Thin ring pack (1.0/1.2mm) — Reduced mass means less friction and faster pressure response compared to traditional thicker ring packages.JE Pro Seal quality — Over 60 years of racing ring technology from NASCAR, NHRA, and ALMS applications, now available for performance street and race builds.

FAQs

What engines does the 3.661 inch bore ring set fit?

This ring set fits any 8-cylinder engine with a 3.661 inch (92.99mm) bore diameter using a 1.0mm / 1.2mm / 2.8mm ring groove configuration. Common applications include the Ford 5.0L Coyote and other modular Ford V8 platforms at this bore size. Always confirm your specific bore diameter and ring groove dimensions before ordering.

Does this ring set work with both OEM and aftermarket pistons?

Yes, provided the pistons have ring grooves sized for 1.0mm top, 1.2mm second, and 2.8mm oil rings at a 3.661 inch bore. These are not piston-specific — they're bore and ring groove specific. Confirm your piston manufacturer's ring specification before purchasing.

Why are thinner rings better for performance applications?

Thinner rings have less mass, which reduces friction losses and allows the ring to respond more quickly to changes in cylinder pressure. At high RPM, ring inertia with heavier rings can actually cause the ring to lift off the groove seat momentarily — thinner rings minimize this effect and maintain a more consistent seal.

What is the difference between nitride and plasma moly top ring coatings?

Nitride is a surface hardening treatment applied to the base ring material. Plasma moly is a coating applied to the ring face that provides excellent lubricity and break-in characteristics. Both are high-performance options — the choice depends on the specific engine application and operating conditions. This set uses a nitride-faced top ring, which is particularly effective in high-heat and boosted environments.

Is this a complete ring set for a full engine build?

This is a ring set for an 8-cylinder engine — it covers all 8 cylinders. It does not include pistons, wrist pins, or other engine components. If you need a complete piston and ring package, JE Pistons offers complete kits that include matched rings.

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