What is the compression ratio of these pistons?

These Manley pistons feature a dish design that results in an 8.5:1 compression ratio. This is a common ratio for performance builds that may use forced induction.

What is the significance of the 85.5mm bore size?

The 85.5mm bore size indicates that these pistons are 0.5mm larger than the standard bore size for the 7-bolt 4G63T engine. This is known as an overbore and is typically used when re-sleeving or honing the cylinders to match the new piston size.

Are these pistons compatible with all 4G63T engines?

These pistons are specifically designed for the 7-bolt 4G63T engine found in the listed Mitsubishi Eclipse, Eagle Talon, Plymouth Laser, and Lancer Evolution models. They are not compatible with the earlier 6-bolt 4G63T engines.

Specifications

Brand: Manley Performance
Part #: 606005C-1
UPC: 807298033914

Manley 03-06 Evo 8/9 (7 Bolt 4G63T) 85.5mm +0.5mm Over Bore 8.5:1 Dish Piston - Single

Name: Manley 03-06 Evo 8/9 (7 Bolt 4G63T) 85.5mm +0.5mm Over Bore 8.5:1 Dish Piston - Single
Brand: Manley Performance
SKU: manley-performance-manley-03-06-evo-8-9-7-bolt-4g63t-85-5mm-0-5mm-over-bore-8-5--t14-188175
Price: 189.71 USD
Availability: BackOrder

$189.71

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Fits 1993-1999 Mitsubishi Eclipse. Manley 85.5mm forged pistons with 8.5:1 dish for improved engine performance.

Key Features

Fits 1993-1999 Mitsubishi Eclipse, 1993-1998 Eagle Talon, 1993-1994 Plymouth Laser, and 2003-2006 Mitsubishi Lancer.
Constructed from domestic 2618 alloy forgings for strength and performance.
Features an 8.5:1 dish compression ratio.
Piston diameter is 85.5mm, a +0.5mm overbore size.
Includes tool steel wrist pins for enhanced durability.
Designed with cam and barrel skirt profiles to reduce cylinder wall wear.

⚠️ 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 with domestic 2618 alloy forgings, these Manley pistons are a solid choice for anyone rebuilding their 4G63T engine. They feature a dish design with an 8.5:1 compression ratio and are sized at 85.5mm, which is a +0.5mm overbore for the 7-bolt 4G63T found in models like the 1993-1999 Mitsubishi Eclipse and Eagle Talon, as well as the 2003-2006 Lancer Evolution. The cam and barrel skirt profiles are designed to be effective while also being gentle on cylinder walls, helping to ensure a longer lifespan for your engine build.

Manley puts a lot of attention into the details that matter for engine sealing and power. The ring lands and grooves are machined to strict standards, which helps achieve a better seal with your piston rings. This attention to detail, combined with the strong 2618 alloy construction, means you're getting a well-built piston that can handle the demands of performance tuning. They also come with tool steel wrist pins for added durability.

If you're working on a 1993-1994 Plymouth Laser or any of the other compatible vehicles, these pistons are a direct fit. Just remember that these are not CARB approved and cannot be shipped to California.