What does the .040 undersize specification mean for these piston rings?

The .040 inch undersize specification indicates that these rings are intended for pistons that have been machined down by 0.040 inches from their original factory size. This is often done when cylinders have been bored out or when dealing with worn pistons during an engine rebuild.

What is the typical application for a bulk pack of 48 piston rings?

A bulk pack of 48 rings is typically purchased by professional engine builders, machine shops, or individuals working on multiple engines simultaneously. It's also practical for larger V-configuration engines that require more than four rings per cylinder bank.

Are these piston rings suitable for all engine types?

These rings are designed for specific engine applications based on their dimensions and undersize specification. It is crucial to confirm that your engine requires 5.005 inch diameter, .043 inch thick, .190 inch wide second groove rings that are .040 inches undersize before purchasing.

Mahle OE Piston Rings PC479 .040 Undersize 3021140B

Name: Mahle Rings PC479 .043 THM Second Groove Ring 5.005 x .043 .190 RW Plain Ring Set (48 Qty Bulk Pack)
Brand: Mahle OE
SKU: mahle-oe-mahle-rings-pc479-043-thm-second-groove-ring-5-005-x-043-190-rw-plain-r-t14-48843
Price: 1298.71 USD
Availability: BackOrder

Mahle Rings PC479 .043 THM Second Groove Ring 5.005 x .043 .190 RW Plain Ring Set (48 Qty Bulk Pack)

$1298.71

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 PC479 piston rings, .040 inch undersize. Set of 48. Part# 3021140B.

Key Features

Fits engines requiring 5.005 inch diameter pistons, .040 inch undersize.
Second groove ring design for optimal engine performance.
Ring dimensions are 5.005 x .043 x .190 inches.
Constructed from plain steel for reliable sealing and durability.
Bulk pack includes 48 rings, ideal for multiple engine builds.
Mahle OE is a trusted brand for engine components.

This is a bulk pack of 48 rings designed for specific engine applications. Please verify your engine's requirements for piston diameter, ring thickness, and width to ensure compatibility.

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Product Details

These Mahle PC479 second groove rings are made from a strong, plain steel material, measuring 5.005 inches in diameter with a thickness of .043 inches and a width of .190 inches. This specific design is intended for the second compression ring position in an engine rebuild. The .040 inch undersize specification means these rings are designed to fit pistons that have been machined down by 0.040 inches from their original size, which is common when re-sleeving cylinders or dealing with worn pistons. This bulk pack contains 48 rings, making it suitable for shops or builders working on multiple engines or larger V-configuration engines.

Mahle OE is a well-known name in engine components, and these rings reflect their focus on providing reliable parts for engine rebuilding. The plain steel construction offers good durability and sealing performance for a wide range of applications. When rebuilding an engine, selecting the correct piston ring set is critical for proper cylinder sealing, oil control, and overall engine performance. These rings are designed to meet the demands of a freshly rebuilt engine, ensuring that compression is maintained and oil consumption is kept in check.

It's important to note that these rings are not CARB approved and cannot be shipped to California. Always refer to your engine's specific service manual for detailed installation instructions and specifications, especially regarding ring gap and end gap, which are crucial for proper function and longevity. This bulk pack is a practical choice for professional engine builders or serious DIYers undertaking a comprehensive engine overhaul.