What is the compression ratio of these pistons?

These JE Pistons feature an 8.5:1 compression ratio. This is a popular choice for builds that plan to use a turbocharger or supercharger, or for naturally aspirated engines where detonation control is a priority.

Are these pistons made in the USA?

Yes, JE Pistons are engineered, forged, and machined 100% in the USA. They are constructed from 2618 aluminum, a material known for its high tensile strength suitable for performance applications.

What is the purpose of the Forged Side Relief (FSR) design?

The proprietary Forged Side Relief (FSR) design helps minimize friction and power loss. It achieves this by reducing the piston skirt width, which also contributes to saving weight.

JE Pistons 4.6 4V Modular 8.5:1 Piston Set 314628

Name: JE Pistons 4.6 4V MODULAR 8.5:1 Set of 8 Pistons
Brand: JE Pistons
SKU: je-pistons-je-pistons-4-6-4v-modular-8-5-1-set-of-8-pistons-t14-296512
Price: 950.07 USD
Availability: BackOrder

JE Pistons 4.6 4V MODULAR 8.5:1 Set of 8 Pistons

$950.07

On Backorder

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

JE Pistons 4.6 4V MODULAR 8.5:1 Set of 8 Pistons. Forged in the USA from 2618 aluminum for high-demand performance.

Key Features

Fits 4.6 4V Modular engines.
Set includes 8 forged pistons.
Features an 8.5:1 compression ratio.
Forged in the USA using 2618 aluminum for high tensile strength.
Proprietary Forged Side Relief (FSR) design minimizes friction and power loss.
Includes an accumulator groove (depending on application) to improve ring seal.

⚠️ CA WARNING: This product can expose you to chemicals known to the State of California to cause cancer and/or birth defects or other reproductive harm. Learn more

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Product Details

If you're building a high-performance 4.6 4V Modular engine, getting the right pistons is crucial for durability and power. This set of eight pistons from JE Pistons is designed specifically for these demanding applications, offering a robust foundation for your build. They feature an 8.5:1 compression ratio, making them suitable for forced induction setups or naturally aspirated builds where you want a bit more control over detonation.

JE Pistons uses a proprietary forged side relief (FSR) design, which helps minimize friction and power loss by reducing skirt width. This design, combined with the use of 2618 aluminum, yields high tensile strength needed for high-demand performance applications. Many applications also include an accumulator groove to help reduce combustion gas pressure, improving ring seal for consistent power, and a skirt coating to reduce friction and wear while also quieting operation. Every piston is forged and machined 100% in the USA, ensuring a well-built component ready for serious work.

This set includes eight pistons, each with a 3.701-inch bore, a 1.220-inch compression distance, and an 0.866-inch pin. Please note that these pistons are not CARB approved and cannot be shipped to California. They are designed for specific engine and use applications to provide optimized performance and durability.