What is the advantage of using 1.5mm oversize pistons?

Using oversize pistons like these 1.5mm larger ones is common when rebuilding an engine. It allows you to re-hone the cylinder walls to a fresh, smooth surface, removing any damage or wear from the original bore. This can also slightly increase engine displacement, potentially leading to a small increase in power.

What is the compression ratio and how is it determined?

This piston set has a dish volume that results in a compression ratio between 10.0:1 and 10.5:1. The exact final compression ratio will depend on the volume of your cylinder head's combustion chamber and the gasket thickness you use during assembly.

Are these pistons coated?

While the manufacturer description mentions moly skirt coatings on select part numbers, this specific set (618215CE-4) features the standard chrome moly wrist pins and 2618 alloy forgings. The skirt profiles are designed to be gentle on cylinder walls.

Specifications

Brand: Manley Performance
Part #: 618215CE-4
UPC: 807298092447

Manley 03-06 Evo VII/IX 4G63T 86.5mm +1.5mm Oversize Bore 10.0/10.5:1 Dish Piston Set with Rings

Name: Manley 03-06 Evo VII/IX 4G63T 86.5mm +1.5mm Oversize Bore 10.0/10.5:1 Dish Piston Set with Rings
Brand: Manley Performance
SKU: manley-performance-manley-03-06-evo-vii-ix-4g63t-86-5mm-1-5mm-oversize-bore-10-0-t14-488876
Price: 893.77 USD
Availability: BackOrder

$893.77

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Manley 03-06 Evo VII/IX 4G63T 86.5mm +1.5mm Oversize Bore 10.0/10.5:1 Dish Piston Set with Rings. Forged from 2618 alloy for superior strength.

Key Features

Fits 2003-2006 Mitsubishi Lancer Evolution VII and IX with the 4G63T engine.
Features an 86.5mm bore size, which is 1.5mm larger than the stock bore.
Dish volume results in a 10.0:1 to 10.5:1 compression ratio.
Constructed from domestic 2618 alloy forgings for superior strength and performance.
Includes premium chrome moly wrist pins for added durability.
Exacting standards for piston ring lands and grooves enhance ring seal and power.

This piston set is specifically designed for the 2003-2006 Mitsubishi Lancer Evolution VII and IX models equipped with the 4G63T engine. Please verify your vehicle's engine and model year before purchase.

⚠️ 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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About this part

Product Details

If you're rebuilding the engine in your 2003-2006 Mitsubishi Lancer Evolution VII or IX, especially if you're looking to increase displacement or refresh worn cylinders, a set of high-performance pistons is crucial. This set from Manley Performance is built for the demanding 4G63T engine, offering a precise 86.5mm bore size, which is 1.5mm larger than stock, and a dish volume that results in a 10.0:1 to 10.5:1 compression ratio depending on your cylinder head volume. This is a common setup for enthusiasts looking for a balance of power and drivability.

Manley uses their signature 2618 alloy forgings for these pistons, a material known for its exceptional strength and durability under high stress, making them a solid choice for performance builds. They feature proven cam and barrel skirt profiles designed to reduce friction and wear on your cylinder walls while still generating significant power. The ring lands and grooves are machined to exacting standards to ensure a tight seal with the included rings, which helps maximize compression and power output. Each piston also comes with premium chrome moly wrist pins, and Manley's unique manufacturing process ensures the ring grooves are perfectly square to the piston skirt for optimal performance.

This piston set is a significant upgrade for anyone serious about their Evo's engine. Keep in mind that these pistons are not CARB approved and cannot be shipped to California. For a complete engine rebuild, ensure you have all necessary gaskets, seals, and machine work completed by a qualified professional.