What is the purpose of the .017-inch dykes gap on these piston rings?

The dykes gap allows the piston ring to expand and contract with temperature changes inside the engine cylinder. This precise gap prevents the ring from binding or seizing as it heats up, ensuring consistent sealing and preventing cylinder wall damage.

Are these piston rings suitable for all types of engines?

These rings are designed for a 4.380-inch bore and are intended for engine rebuilding or performance applications. While Mahle OE rings meet original equipment standards, it's crucial to verify that this specific ring set matches your engine's bore size and application requirements.

What does 'Not CARB approved' mean for this product?

This means the product does not meet the emissions standards set by the California Air Resources Board (CARB). Consequently, it cannot be legally sold or shipped to California due to emissions regulations.

Mahle OE Piston Rings 4.380in Bore .017in Dykes PC479 - 3010

Name: Mahle Rings 4.380in Bore Dia .017in Dykes PC479 Top Rings Plain Ring Set (48 Qty Bulk Pack)
Brand: Mahle OE
SKU: mahle-oe-mahle-rings-4-380in-bore-dia-017in-dykes-pc479-top-rings-plain-ring-set-t14-51059
Price: 843.92 USD
Availability: BackOrder

Mahle Rings 4.380in Bore Dia .017in Dykes PC479 Top Rings Plain Ring Set (48 Qty Bulk Pack)

$843.92

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, 4.380in bore, .017in dykes, PC479 top rings. Bulk pack of 48.

Key Features

This bulk pack contains 48 sets of Mahle OE PC479 top piston rings.
Designed for a 4.380-inch bore diameter.
Features a .017-inch dykes gap for proper thermal expansion.
Built to original equipment (OE) specifications for reliable fit and function.
Suitable for engine rebuilding and performance applications.
Not CARB approved and cannot be shipped to California.

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Product Details

This bulk pack includes 48 sets of Mahle OE PC479 top piston rings, designed for a 4.380-inch bore with a .017-inch dykes gap. These rings are a crucial component for rebuilding or refreshing an engine, ensuring proper sealing between the piston and cylinder wall. Mahle is a well-known name in engine components, and these rings are built to OE specifications, meaning they meet the original equipment standards for fit and function.

The PC479 top ring features a specific profile and material composition intended for durability and effective sealing under combustion pressure. The .017-inch dykes gap is a precise measurement that allows for thermal expansion of the piston and ring within the cylinder bore, preventing binding and ensuring consistent performance. This bulk pack is ideal for machine shops or engine builders working on multiple engines or high-performance builds where a large quantity of high-quality rings is needed. Proper installation is key; ensure the cylinder walls are honed correctly and the rings are seated according to manufacturer guidelines for optimal performance and longevity.

When rebuilding an engine, selecting reliable piston rings is essential for compression, oil control, and overall engine health. These Mahle OE rings offer a solid option for builders who prioritize OE-level quality and performance. Please note that these rings are not CARB approved and cannot be shipped to California.