What is the advantage of using forged pistons like these Manley pistons?

Forged pistons are made from a solid block of metal that is heated and hammered into shape, making them much stronger and more durable than cast pistons. This strength allows them to withstand higher cylinder pressures and temperatures, making them ideal for performance or heavily modified engines.

What does the '+1mm Over Bore' and '86mm' specification mean?

This means the pistons are designed to be used in a cylinder bore that has been machined to be 1 millimeter larger than the original factory specification. The 86mm is the actual diameter of the piston itself, which corresponds to the +1mm overbore size for the 4G63T engine.

Are these pistons compatible with all 4G63T engines?

These specific pistons are designed for the 7-bolt 4G63T engine found in the 2003-2006 Mitsubishi Lancer Evolution 8 and 9 models. It's important to confirm your engine's configuration before ordering, as earlier 4G63T engines had a different bolt pattern.

Specifications

Brand: Manley Performance
Part #: 606010CE-4
UPC: 807298088723

Manley 03-06 Mit Evo 8/9 (7 Bolt 4G63T) 86mm +1mm Over Bore 8.5:1 Dish Extreme Duty Pistons w/ Rings

Name: Manley 03-06 Mit Evo 8/9 (7 Bolt 4G63T) 86mm +1mm Over Bore 8.5:1 Dish Extreme Duty Pistons w/ Rings
Brand: Manley Performance
SKU: manley-performance-manley-03-06-mit-evo-8-9-7-bolt-4g63t-86mm-1mm-over-bore-8-5--t14-28602
Price: 893.77 USD
Availability: BackOrder

$893.77

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Manley Extreme Duty pistons for 03-06 Mitsubishi Evo 8/9 (7 Bolt 4G63T). 86mm bore, 8.5:1 compression for improved performance.

Key Features

Fits 2003-2006 Mitsubishi Lancer Evolution 8/9 (7 Bolt 4G63T).
86mm bore size, which is a +1mm overbore.
Dish piston design results in an 8.5:1 compression ratio.
Constructed from domestic 2618 alloy forgings for superior strength.
Includes premium tool steel wrist pins for added durability.
Piston skirt profiles are designed to reduce cylinder wall wear while maximizing power.

These pistons are designed for the 2003-2006 Mitsubishi Lancer Evolution 8 and 9 models with the 7-bolt 4G63T engine. They are a +1mm overbore size.

⚠️ 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 8 or 9, especially the 7-bolt 4G63T, these Manley Extreme Duty pistons are a solid choice for serious performance. These are +1mm overbore pistons, measuring 86mm, and feature a dish design that results in a compression ratio of 8.5:1. This setup is designed for builders looking for robust internals that can handle increased power demands.

Manley uses their signature 2618 alloy forgings for these pistons, which are known for their strength and ability to withstand high temperatures and pressures. The pistons come with tool steel wrist pins for added durability, and the skirt profiles are carefully shaped to reduce friction and wear on the cylinder walls while still generating substantial power. The ring lands and grooves are machined to very strict tolerances, which is crucial for ensuring a good seal between the piston rings and the cylinder wall. This precise machining helps to maximize power output and maintain engine health.

This set includes the pistons and rings, ready for installation. Keep in mind that these pistons are not CARB approved and cannot be shipped to California. For builders aiming for a strong foundation for a performance engine, these Manley pistons offer a well-built option with proven materials and design.