What is the primary function of piston rings?

Piston rings have a few key jobs. They seal the combustion chamber to maintain compression, regulate oil by scraping excess oil from the cylinder walls, and help transfer heat from the piston to the cylinder wall.

Why would I need to replace my piston rings?

You would typically replace piston rings during an engine rebuild or if you're experiencing symptoms like excessive oil consumption, low compression, or noticeable blow-by. New rings restore proper sealing and performance.

Can this part be shipped to California?

No, this part is not CARB approved and cannot be shipped to California due to emissions regulations.

HKS Piston Ring Set N4 21005-AN004

Name: HKS PISTON RING SET N4
Brand: HKS
SKU: hks-hks-piston-ring-set-n4-t14-113049
Price: 407.30 USD
Availability: BackOrder

HKS PISTON RING SET N4

$407.30

On Backorder

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

HKS Piston Ring Set N4

Key Features

Fits specific engine applications.
Designed to maintain proper cylinder compression.
Helps control oil consumption.
Manufactured by HKS, a well-known performance parts brand.
Built to precise tolerances for a reliable seal.

No-fit, no charge. Wrong part? Send it back, free return label.

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Product Details

This is the HKS Piston Ring Set N4, part number 21005-AN004. These rings are a direct replacement for your engine's original piston rings, designed to maintain proper compression and oil control within the cylinders. When rebuilding or refreshing an engine, new piston rings are essential for restoring lost performance and ensuring the longevity of your build.

HKS is known for its well-built engine components, and this ring set is no exception. They are manufactured to precise tolerances to ensure a good seal against the cylinder wall, which is critical for efficient combustion. Proper sealing prevents combustion gases from blowing past the pistons (known as blow-by) and also helps to keep oil from entering the combustion chamber. This set is intended for specific engine applications where performance and reliability are key considerations.

It's important to note that this part is not CARB approved and cannot be shipped to California. Always refer to the manufacturer's installation instructions for proper fitment and assembly procedures when working on your engine.