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Control compression and oil with a thin-ring eight-cylinder package
MAHLE Motorsport 3667MS-112 supplies eight file-fit cylinder sets for a 3.662-inch finished bore. The 1.0 mm, 1.0 mm, and 2.0 mm package combines low cross-section compression rings with a standard-tension oil-control assembly for precision engine builds.
Key Features
- Eight-cylinder piston-ring set
- 3.662-inch finished bore size
- +.005-inch file-fit configuration
- 1.0 mm top compression ring
- 1.0 mm second compression ring
- 2.0 mm standard-tension oil-control assembly
- Steel HV385-treated top ring, phosphate-coated steel second ring, and chrome-faced stainless-steel oil ring
Fitment
| Application | Required Bore | Required Configuration | Exclusions |
|---|---|---|---|
| Universal eight-cylinder performance engine build | 3.662-inch finished bore | 1.0 / 1.0 / 2.0 mm file-fit ring grooves and builder-specified end gaps | Not a drop-in set; not for a different bore, groove package, cylinder count, or unverified engine configuration |
Specifications
| Detail | Value |
|---|---|
| Manufacturer Part Number | 3667MS-112 |
| Product Type | Performance piston-ring set |
| Cylinder Count | Eight |
| Finished Bore | 3.662 inches / 93.014 mm |
| Fit Style | +.005-inch file fit |
| Top Ring | 1.0 mm steel with HV385 thermal facing |
| Second Ring | 1.0 mm phosphate-coated steel |
| Oil Ring | 2.0 mm standard-tension stainless steel with chrome facing |
| Gapless | No |
| Gas Ported | No |
What's Included
- Eight top compression rings
- Eight second compression rings
- Eight three-piece oil-control assemblies
- Pistons, wrist pins, locks, bearings, gaskets, ring compressor, measuring tools, and installation labor are not included
About MAHLE Motorsport
MAHLE Motorsport develops pistons, rings, pins, and related components for racing and performance engine programs. Its ring sets are selected by exact bore, groove dimensions, ring thickness, cylinder count, material package, tension, and required fitting method.
Related Parts
- Pistons with verified 1.0 / 1.0 / 2.0 mm ring grooves and 3.662-inch bore compatibility
- Precision ring filer and ring-squaring tool
- Feeler gauges, bore gauge, and micrometers suitable for engine assembly
- Ring compressor sized for the finished bore and piston design
FAQ
What is the 3667MS-112?It is an eight-cylinder Performance Series piston-ring set for 3.662-inch finished bores, with file-fit end gaps and standard-tension oil control.
How many cylinders does this set service?The package contains eight cylinder sets.
What ring thicknesses are included?Each cylinder set uses a 1.0 mm top ring, a 1.0 mm second ring, and a 2.0 mm oil-control assembly.
Are these rings drop-in?No. They are file-fit rings and must be measured and filed to the engine builder's verified end-gap specifications.
What is the finished bore size?MAHLE specifies a 3.662-inch, or 93.014 mm, finished bore with the file-fit allowance identified for this set.
What materials and finishes are used?Summit lists a steel HV385-treated top ring, phosphate-coated steel second ring, and a chrome-faced stainless-steel oil ring assembly.
Is this set tied to one vehicle?No. Selection is based on finished bore, ring-groove dimensions, cylinder count, end-gap target, and the engine builder's requirements.
Can the rings be installed without measuring the cylinders?No. Measure each bore and ring gap, confirm ring orientation, and follow the piston and engine builder's current specifications.
Installation Instructions
- Confirm the engine has eight 3.662-inch finished bores and pistons with compatible 1.0 / 1.0 / 2.0 mm ring grooves.
- Measure every cylinder for size, taper, and out-of-round condition before fitting any ring.
- Verify the package and manufacturer part number before separating or filing the rings.
- Square each ring in its assigned cylinder and measure the end gap with clean feeler gauges.
- File the ring ends gradually to the piston or engine builder's current end-gap specification, keeping the ends square and deburred.
- Clean the rings and grooves, identify the top and second ring orientation, and assemble the three-piece oil-control rings without overlapping the expander ends.
- Stagger ring gaps according to the piston and engine builder's instructions, then compress the rings with the correct tool.
- Install each piston in its assigned cylinder, verify free movement, and complete the engine assembly to the applicable torque, lubrication, and break-in procedures.
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