J.E. PISTONS 399157 Piston Kit 193564567611 4.255 11.5 108

( Brand: J.e. Pistons ), ( Manufacturer Part Number: 399157 ), ( Part Type: Piston ), ( Bore Size: 4.255 ), ( Compression Ratio: 11.5 ), ( Displacement: 108 ), ( Piston Material: Forged 2618 Aluminum ), ( Stroke Length: 4.500 ), ( Units: Kit ), ( Alt Mpn 1: 0910-7015 ), ( Average Delivery Time: 2-3 Days ), ( Package Weight: 3.2500 ), ( Package Length: 10.50 ), ( Package Width: 5.75 ), ( Package Height: 5.50 ), ( Manufacturer Warranty: 30 Days ), ( UPC: 193564567611 )

Review J.E. PISTONS Piston Kit 4.255 Inch Bore Stroke 11.5 108 fits M8 CR

Introducing the J.E. Pistons 399157 Kit, an exceptional upgrade for your engine that delivers enhanced power and reliability. This piston kit is engineered for applications requiring a 4.255-inch bore, 11.5:1 compression ratio, and a connecting rod length of 108mm, making it suitable for various high-performance engines.

The J.E. Pistons 399157 Kit is a complete solution, consisting of four forged pistons, each designed with meticulous attention to detail. The pistons are crafted from 2618-T6 aluminum alloy, a material renowned for its exceptional strength and durability. The piston crowns are honed to precise dimensions, ensuring perfect fitment and optimal combustion efficiency.

This kit is further enhanced by the inclusion of lightweight, forged steel M8 connecting rods. These rods are designed to provide superior strength and rigidity, ensuring the pistons remain in perfect alignment with the crankshaft even under the most demanding conditions.

The J.E. Pistons 399157 Kit also features Chromoly steel piston pins, which boast superior strength, rigidity, and durability compared to conventional steel or aluminum pins. The pins are also coated with a low-friction, hard-anodized finish that minimizes wear and ensures smooth operation.

Additionally, the pistons are equipped with floating wrist pins, which allow the piston to float within the connecting rod during engine operation. This design helps to reduce friction and wear, resulting in improved engine performance and longevity.

The J.E. Pistons 399157 Kit also includes new piston rings, which are precision-machined from high-quality materials for optimal sealing and durability. The kit includes two compression rings, one oil control ring, and one top ring.

In summary, the J.E. Pistons 399157 Kit is a high-performance upgrade for your engine that delivers superior strength, durability, and power. With forged pistons, lightweight connecting rods, Chromoly steel piston pins, and precision-machined piston rings, this kit is the ideal solution for those seeking to maximize the potential of their engine.

Buying a JE Pistons 399157 Kit: A Comprehensive Analysis

The JE Pistons 399157 kit is a popular choice among engine builders and enthusiasts for its high-performance capabilities. This piston kit is designed for applications with a 4.255-inch bore, 11.5:1 compression ratio, and a connecting rod length of 108mm. In this analysis, we will discuss the potential advantages and disadvantages of purchasing this piston kit, followed by a conclusion and recommendation.

1. High-Performance Design: JE Pistons are renowned for their high-performance designs, which cater to various engine applications, including racing and high-horsepower builds. The 399157 kit is no exception, offering enhanced power output and durability.

2. Customizable: JE Pistons offers a variety of options, enabling customers to tailor their piston kit to their specific engine application. This includes different skirt designs, secondaries, ring packages, and coating options.

3. Precision Manufacturing: JE Pistons utilizes advanced manufacturing techniques, such as CNC machining and 3D modeling, to ensure that each piston is produced to exacting specifications, leading to improved engine performance and longevity.

4. Wide Compatibility: The 399157 kit is compatible with a wide range of engines and applications, making it a versatile choice for engine builders and enthusiasts.

1. Cost: JE Pistons are known for their premium pricing compared to other aftermarket piston manufacturers. The 399157 kit, in particular, can be quite expensive, which may deter some buyers.

2. Complex Installation: Installing aftermarket pistons, such as those from JE Pistons, can be a complex process that requires specialized tools and knowledge. This may add to the overall cost and time investment for the engine build.

3. Potential Clearance Issues: Depending on the specific engine application, there may be clearance issues between the piston, connecting rod, and crankshaft that need to be addressed during installation.

The JE Pistons 399157 kit offers several advantages for engine builders and enthusiasts, including high-performance design, customizability, precision manufacturing, and wide compatibility. However, it also comes with some disadvantages, including a high cost, complex installation process, and potential clearance issues.

If you are seeking high-performance pistons for your engine build and have the budget to accommodate the premium pricing, the JE Pistons 399157 kit is an excellent choice. Its customizable options, precision manufacturing, and wide compatibility make it a versatile and reliable solution for various engine applications. However, if budget or installation complexity are concerns, alternative piston manufacturers with more affordable options may be worth considering. Ultimately, the decision to purchase the JE Pistons 399157 kit should be based on your specific engine application requirements and budget.

Details:

Skirt coating reduces operating friction and wear. Offset pins reduce piston rock and minimize operating noise. 100% satisfaction guaranteed. STROKE length 4.500.

Piston Kit - 4.255 Bore Stroke 11.5:1 CR 108 M8 399157. Skirt notches for optimal clearance at bottom dead center. Combined shipping available. Includes two Pistons, premium ring packs, wrist pins and wire locks.

Item Specifics. Accumulator groove taps combustion gases below the top ring to promote more consistent, positive seal and performance. BORE SIZE4.255. PART TYPE Engine Related Parts.

part #: 399157 prices

• $474.99-$498.99

specifications pistondon:

• for models: M8, Cr
• brand: J.e. Pistons
• mpn: 399157
• part type: Piston
• bore size: 4.255
• compression ratio: 11.5
• displacement: 108
• piston material: Forged 2618 Aluminum
• stroke length: 4.500
• units: Kit
• alt mpn 1: 0910-7015
• average delivery time: 2-3 Days
• package weight: 3.2500
• package length: 10.50
• package width: 5.75
• package height: 5.50
• manufacturer warranty: 30 Days
• upc: 193564567611

offer pistondon:

• options: Ship-to-home
• quantity: 3
• sold: 0
• started: November 4, 2025
• availability: In Stock

payments pistondon:

• other
• credit card: Diners-club
• wallet: Apple-pay

general pistondon:

• condition: New
• Motorcycle Scooter Parts Accessories > Engines Engine Parts > Pistons, Rings Piston Kits

shipping pistondon:

• cost: $0.00
• service: FedEx Ground / FedEx Home Delivery, FedEx 2Day, FedEx Standard Overnight
• carrier: FedEx
• class: Standard, Expedited, One-day
• transit: 2-6 Days
• type: Calculated

seller pistondon:

• rating: 99.3%
• city: Hilliard, Ohio
• # reviews: 489682

returns pistondon:

• policy: Returns Accepted
• paid by: Seller
• time: 30 Days

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