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MAHLE 3150036-025 Plasma-Moly Piston Ring Set 4.025 in. Bore 1/16 1/16 3/16 File Fit

Manufacturer

Picture for manufacturer MAHLE

Part Number

3150036-025
11 reviews
Sale Price

$117.76

Estimated ship date Saturday, November 21

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Product Details

The MAHLE 3150036-025 is a precision-ground, plasma-moly piston ring set engineered for performance and racing applications. Designed for a 4.025-inch bore (+.025" oversize), this file-fit set features standard tension carbon steel construction with ring widths of 1/16" (top), 1/16" (second), and 3/16" (oil), and is sold as a complete 8-cylinder set.

Key Features:

  • Plasma-moly top ring: Ductile iron, barrel-faced design with plasma-moly inlay for rapid break-in and long-term wear resistance under high heat and pressure
  • Napier THG (Tapered Hook Groove) second ring: Acts as a check valve to relieve combustion pressure buildup under the top ring, delivering superior oil control and improved combustion gas management
  • CP-20 3-piece oil control ring: Features a 20-degree ear angle and a stainless steel expander between two chrome-faced steel rails for maximum cylinder wall conformability and superior side sealing
  • Reduced Radial Wall (RRW) top rings: Lowers cylinder wall tension to reduce parasitic drag and free up measurable horsepower
  • File-fit design: Allows the builder to custom-fit ring end gaps to exact specifications for the application
  • Foolproof installation: Rings are engineered to prevent incorrect installation, saving time and reducing the risk of assembly errors
  • Precision ground: Manufactured under strict quality controls for consistent, accurate dimensions across every ring in the set

MAHLE is the world's largest piston ring manufacturer, with over a century of OE and aftermarket engineering experience. The 3150036-025 ring set is the ideal choice for engine builders performing overhauls, re-rings, or performance builds requiring a reliable, race-proven piston ring solution.

Specifications:

  • Bore Size: 4.025 in. (+.025" oversize)
  • Top Ring Thickness: 1/16 in.
  • Second Ring Thickness: 1/16 in.
  • Oil Ring Thickness: 3/16 in.
  • Fit Type: File Fit
  • Tension: Standard
  • Material: Carbon Steel
  • Top Ring Face: Plasma-Moly
  • Quantity: Sold as a set (8-cylinder)
  • Manufacturer Part Number: 3150036-025

Products specifications

Bore (in)

4.020 in.

Bore (mm)

102.108mm

File Fit

Yes

Gapless

No

Notes

Napier (taper hooked groove) design second ring.

Oil Ring Included

Yes

Oil Ring Material

Stainless steel

Oil Ring Tension

Standard

Oil Ring Thickness

3/16 in.

Quantity

Sold as a set.

Second Ring Facing Material

Cast iron

Second Ring Included

Yes

Second Ring Material

Cast iron

Second Ring Thickness

1/16 in.

Top Ring Facing Material

Plasma-moly

Top Ring Included

Yes

Top Ring Material

Ductile iron

Top Ring Thickness

1/16 in.

Good so far

Easy, quick, convenient. What else could i ask for? Nothing! Thanks guys.

outstanding experience.

nice and easy

Great prices and fast shipping. Saved $100 buying here. Will do business again

Amazing prices and quick shipping. Cheaper than the discount catalogs too! AWESOME!!!

Great prices

Autoplicity are great! Shipped out my order quick with good prices!

Very quick and easy!!

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Has the cheapest prices around. Very easy to checkout and quick shipping. Everything a customer could ask for.

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