What is the purpose of the ArmorGlide skirt coating?

The ArmorGlide skirt coating on these Wiseco pistons is designed to reduce friction between the piston skirt and cylinder wall. This helps prevent seizure and also contributes to quieter operation of the engine.

What does the +.040 undersize mean for this piston set?

The '+.040' designation indicates that these pistons are 0.040 inches larger than the standard bore size. This is common when rebuilding an engine that has already been bored out or to account for wear, ensuring a proper fit in the cylinder.

Are these pistons suitable for a street-driven car?

These Wiseco HD2 pistons are specifically designed for heavy to severe duty race builds. While they can be used in a performance street application, their primary design focus is on extreme durability and performance under racing conditions.

Wiseco Evo 4-9 HD2 Piston Set 86.00mm Bore K669M86AP

Name: Wiseco Mitsu Evo 4-9 HD2 Asymmetric Skirt Gas Ported Bore 86.00mm -Size +.040 - CR 10.5:1 Piston Set
Brand: Wiseco
SKU: wiseco-wiseco-mitsu-evo-4-9-hd2-asymmetric-skirt-gas-ported-bore-86-00mm-size-04-t14-4309524
Price: 895.99 USD
Availability: InStock

Wiseco Mitsu Evo 4-9 HD2 Asymmetric Skirt Gas Ported Bore 86.00mm -Size +.040 - CR 10.5:1 Piston Set

$895.99

Only 1 left in stock

Wiseco Evo 4-9 HD2 forged piston set, 86.00mm bore, 10.5:1 CR. Built for severe duty race builds.

Key Features

Fits Mitsubishi Evo 4-9 4G63T engines.
Forged from 2618 aluminum for improved tensile strength.
86.00mm bore size, with a +.040 undersize.
10.5:1 compression ratio.
Asymmetric skirt design with ArmorGlide skirt coating for reduced friction and seizure resistance.
Features precision ring grooves, anti-detonation groove, and forced pin oiling.

⚠️ 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

Forged from 2618 aluminum for improved tensile strength, these Wiseco HD2 pistons are built for the demanding Mitsubishi Evo 4-9 engine builds. The 86.00mm bore size, with a +.040 undersize, is ready for your performance rebuild. This set is designed to handle heavy to severe duty race applications, ensuring durability when you push your engine hard.

Wiseco has packed these pistons with features to enhance performance and longevity. You'll find precision ring grooves, an anti-detonation groove, and additional features for improved ring seal. The asymmetric skirt design, combined with an ArmorGlide skirt coating, helps reduce friction and resist seizure, while also contributing to quieter operation. The crown is fully machined for accuracy, and forced pin oiling ensures the wrist pins stay well-lubricated under high stress.

This set includes four pistons, each with a 10.5:1 compression ratio, ready to be installed in your 4G63T engine. Please note that these pistons are not CARB approved and cannot be shipped to California. For a complete rebuild, ensure you have all necessary supporting components and refer to manufacturer instructions for proper installation.