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MAHLE 4390MS 4.390" Bore Piston Ring Set 1/16 1/16 3/16 Standard Tension

Part of: MAHLE Piston Ring Set Bore Standard Tension

Other options in this family: MAHLE 4030MS MAHLE 4155MS MAHLE 4145MS MAHLE 4080MS MAHLE 4280MS

Manufacturer

Picture for manufacturer MAHLE

Part Number

4390MS
7 reviews
Sale Price

$103.12

In Stock (10+)

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Usually delivered within 2 days

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Product Details

The MAHLE 4390MS piston ring set is designed for engines with a 4.390" bore diameter and features a drop-in standard tension configuration with 1/16", 1/16", 3/16" ring widths. MAHLE utilizes advanced piston ring simulation and computer development tools to engineer rings that minimize friction and unlock free horsepower, delivering measurable performance gains on both the dyno and the track.

Ring Configuration:

  • Top Ring: Ductile iron construction with plasma moly coating and barrel face profile for superior sealing and wear resistance
  • Second Ring: Cast iron reverse twist design for optimal oil control and cylinder wall conformability
  • Oil Ring: 3-piece standard tension configuration for effective oil management

Key Features:

  • Ultra-flat ring flanks maximize ring-to-piston sealing efficiency
  • Drop-in installation for straightforward fitment
  • Standard tension design balances sealing performance with reduced friction
  • Precision-engineered to MAHLE's exacting OE and performance standards

MAHLE piston rings are trusted by professional engine builders and enthusiasts alike for their proven durability, superior sealing characteristics, and performance-oriented design. This ring set provides an excellent solution for engine rebuilds and performance applications requiring reliable, high-quality piston rings.

Products specifications

Bore (in)

4.390 in.

Bore (mm)

111.506mm

File Fit

No

Gapless

No

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.

Piston Ring Thickness

1/16, 1/16, 3/16

Prop 65

WARNING: Cancer and Reproductive Harm - www.p65warnings.ca.gov

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Fast easy

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Great experience! I placed my order on Sunday and my programmer arrived on Thursday - with ground shipping. I unpacked the programmer and it functioned exactly as I had hoped. I will definitely consider purchasing from Autoplicity again!

Order arrived quickly and was exactly as described. Great prices and service!

Very fast shipping and price is rite

Fast service, great prices, highly recomended retailer.

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