What does '0.030 inch undersize' mean for these piston rings?

This means the rings are manufactured to be 0.030 inches smaller in diameter than standard size. They are intended for use in engines where the cylinder bores have been machined (honed) out to accommodate this specific size, often during an engine rebuild to account for wear or previous machining.

What is the benefit of the moly coating on these rings?

The moly coating helps to reduce friction between the piston ring and the cylinder wall. This can lead to improved engine efficiency, reduced wear, and a smoother break-in process for the engine.

Are these rings compatible with all 4.0L Ford engines?

This specific ring set, part number 41550CP.030, is designed for 4.0L Ford engines from 1990-1994 and 4016cc Mazda engines from 1991-1994, as well as fitting a broader range of Ford, Mazda, and Mercury vehicles listed in the fitment data. Always verify fitment for your specific year, make, and model.

Mahle OE Piston Rings Moly Ring Set 41550CP.030

Name: Mahle Rings Ford Trk 244 4.0L Eng 1990-94 Mazda 4016cc Eng 1991-94 Moly Ring Set
Brand: Mahle OE
SKU: mahle-oe-mahle-rings-ford-trk-244-4-0l-eng-1990-94-mazda-4016cc-eng-1991-94-moly-t14-49646
Price: 59.08 USD
Availability: BackOrder

Mahle Rings Ford Trk 244 4.0L Eng 1990-94 Mazda 4016cc Eng 1991-94 Moly Ring Set

$59.08

On Backorder

Order now to reserve yours — we'll ship as soon as stock arrives. Full refund if we're unable to fulfill.

Mahle OE Moly Ring Set, 0.030 inch undersize. Minimizes oil consumption and friction for longer engine life.

Key Features

Fits a wide range of Ford, Mazda, and Mercury vehicles including the Ford Explorer, Ranger, and Mazda B4000.
This is a 0.030 inch undersize ring set, intended for use with pistons that have been machined to this specification.
Features a moly coating to reduce friction and improve wear resistance.
Designed to minimize engine oil consumption.
Built to meet OE requirements for performance and durability.
Mahle OE brand piston rings.

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Product Details

These Mahle piston rings are 0.030 inch undersize, meaning they are designed to fit pistons that have been honed out slightly beyond their original factory specification. This is a common practice when rebuilding an engine to ensure a proper seal and account for wear or previous machining. Mahle is known for its advanced piston ring technology, focusing on reducing friction and minimizing oil consumption. This set is built to meet the demanding requirements of OE specifications, aiming for a longer service life for your engine.

When you're rebuilding the top end of your Ford truck, Explorer, Ranger, or Mazda B4000, a well-built set of piston rings like these is crucial for proper engine function. They are designed to create a tight seal between the piston and the cylinder wall, which is essential for compression and preventing oil from entering the combustion chamber. The moly coating on these rings helps to reduce friction during break-in and throughout the life of the engine, contributing to improved efficiency and durability.