What is the purpose of the cam and barrel skirt profiles on these pistons?

These profiles are designed to reduce friction and wear on the cylinder walls during engine operation. This helps to improve engine efficiency and extend the lifespan of both the pistons and the cylinder walls.

Are the rings included with these Manley pistons?

Yes, these pistons come complete with the necessary rings. The exacting ring lands and grooves are machined to ensure a proper seal with the included ring set.

What does the 8.5/9.0:1 dish compression ratio mean for my Evo?

This dish volume is designed to achieve a specific compression ratio when paired with the 4G63T engine and various cylinder head configurations. It's a common choice for boosted applications where tuners aim for a balance between power and reliability.

Specifications

Brand: Manley Performance
Part #: 617005CE-4
UPC: 807298091136

Manley 03-06 Mitsubishi Evo 8/9 4G63T 85.5mm +.5mm Bore 8.5/9.0:1 Dish Extreme Duty Pistons w/ Rings

Name: Manley 03-06 Mitsubishi Evo 8/9 4G63T 85.5mm +.5mm Bore 8.5/9.0:1 Dish Extreme Duty Pistons w/ Rings
Brand: Manley Performance
SKU: manley-performance-manley-03-06-mitsubishi-evo-8-9-4g63t-85-5mm-5mm-bore-8-5-9-0-t14-4402523
Price: 893.77 USD
Availability: BackOrder

$893.77

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Manley 03-06 Mitsubishi Evo 8/9 4G63T forged pistons. 85.5mm bore, 8.5/9.0:1 dish, extreme duty.

Key Features

Fits 2003-2006 Mitsubishi Evo 8/9 with 4G63T engine.
Forged from domestic 2618 alloy for superior strength and performance.
85.5mm bore size (+.5mm overbore) with an 8.5/9.0:1 compression dish.
Features Manley's signature cam and barrel skirt profiles for reduced wear and improved power.
Exacting ring lands and grooves ensure enhanced ring seal and power output.
Includes premium chrome moly wrist pins for added durability.

These pistons are designed for the 2003-2006 Mitsubishi Lancer Evolution 8 and 9 models equipped with the 4G63T engine. Please verify compatibility with your specific vehicle and engine configuration.

⚠️ 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

Built from domestic 2618 alloy forgings, these Manley Extreme Duty pistons are made to handle the demands of a high-performance 4G63T engine found in the 2003-2006 Mitsubishi Evo 8 and 9. The 85.5mm bore size, which is a +.5mm overbore from stock, is a common choice when rebuilding or upgrading these engines, especially when paired with the 8.5/9.0:1 compression dish. This specific dish volume is designed to work with a variety of cylinder head configurations, helping tuners achieve their desired compression ratio for boosted applications.

Manley's signature cam and barrel skirt profiles are engineered to reduce friction and wear on the cylinder walls, contributing to both power gains and engine longevity. The pistons feature exacting ring lands and grooves, which are crucial for ensuring a solid seal with the included rings. This tight tolerance machining helps maximize combustion pressure and improve overall engine efficiency. Each set comes standard with premium chrome moly wrist pins, known for their strength and durability under high stress.

For those pushing the limits, Manley's unique fixturing process allows for skirt turning and ring groove machining in a single operation. This ensures the ring grooves remain perfectly square to the piston skirt, a critical detail for optimal ring seal and preventing blow-by, especially in heavily modified or race-focused builds. These pistons are a solid choice for professional engine builders and tuners looking for reliable performance and durability.