What is a Dykes ring design?

A Dykes ring design features a tapered face on the top of the ring. This taper helps the ring seal more effectively against the cylinder wall under combustion pressure, which can improve compression and oil control.

What does the .017 inch measurement refer to?

The .017 inch measurement refers to the thickness of the Dykes face on the top ring. This specific dimension is critical for proper sealing within the cylinder bore.

Why can't these rings ship to California?

These piston rings are not CARB (California Air Resources Board) approved. This means they do not meet California's emissions standards for certain engine components, and therefore cannot be legally shipped into the state.

Mahle OE Piston Rings 4.315in Bore Dia .017in Dykes PC479 -

Name: Mahle Rings 4.315in Bore Dia .017in Dykes PC479 Top Rings Plain Ring Set (48 Qty Bulk Pack)
Brand: Mahle OE
SKU: mahle-oe-mahle-rings-4-315in-bore-dia-017in-dykes-pc479-top-rings-plain-ring-set-t14-51139
Price: 984.45 USD
Availability: BackOrder

Mahle Rings 4.315in Bore Dia .017in Dykes PC479 Top Rings Plain Ring Set (48 Qty Bulk Pack)

$984.45

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 piston rings for 4.315in bore engines. Bulk pack of 48 top rings.

Key Features

Fits engines with a 4.315 inch bore diameter.
Includes 48 top piston rings in a bulk pack.
Features a .017 inch Dykes design for the top ring.
These are plain ring sets, part number PC479.
Not CARB approved; cannot ship to California.

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Product Details

Mahle is a well-known name in the automotive industry, particularly for their expertise in engine components. This bulk pack of 48 top piston rings is designed for engines with a 4.315-inch bore diameter. These are plain ring sets, specifically the PC479 type, featuring a .017-inch Dykes design, which is a common configuration for top compression rings.

This set is intended for engine builders or shops that frequently work on engines requiring this specific bore size and ring type. The Dykes design, with its tapered face, helps to create a tighter seal against the cylinder wall as cylinder pressures increase, contributing to better compression and oil control. Having 48 rings in a bulk pack means you'll have plenty on hand for multiple engine builds or for engines that require multiple cylinders with this bore size.

It's important to note that these rings are not CARB approved and cannot be shipped to California. Always refer to your specific engine's service manual for proper installation procedures and ring gap specifications to ensure optimal performance and longevity of your engine rebuild.