What is the advantage of the 8.5:1 compression ratio?

An 8.5:1 compression ratio is generally lower than stock, which is beneficial for turbocharged or supercharged engines. This lower ratio helps prevent detonation or 'knocking' under boost, allowing for more aggressive tuning and power output while maintaining engine safety.

What does the +.5mm oversize bore mean for installation?

The +.5mm oversize designation means these pistons are larger than the original factory pistons. Your engine block's cylinders will need to be bored and honed to precisely match this 85.5mm diameter to ensure a proper fit and seal.

What is included in this piston set?

This Manley piston set includes the four pistons, the necessary piston rings for each piston, and the premium chrome moly wrist pins required for installation.

Specifications

Brand: Manley Performance
Part #: 618005C-4
UPC: 807298020105

Manley 03-06 EVO VIII/IX 85.5mm +.5mm Oversize Bore 8.5:1 Dish Piston Set with Rings

Name: Manley 03-06 EVO VIII/IX 85.5mm +.5mm Oversize Bore 8.5:1 Dish Piston Set with Rings
Brand: Manley Performance
SKU: manley-performance-manley-03-06-evo-viii-ix-85-5mm-5mm-oversize-bore-8-5-1-dish--t14-21382
Price: 758.81 USD
Availability: BackOrder

$758.81

On Backorder

Order now to reserve yours — we'll ship as soon as stock arrives. Full refund if we're unable to fulfill.

Fits 1993-1999 Mitsubishi Eclipse. Manley forged piston set with 85.5mm bore and 8.5:1 compression for improved engine performance.

Key Features

Fits 1993-1999 Mitsubishi Eclipse, 2003-2006 Mitsubishi Lancer, 1993-1998 Eagle Talon, and 1993-1994 Plymouth Laser.
Forged from domestic 2618 alloy for superior strength and performance.
85.5mm bore size is a +.5mm oversize, suitable for honed cylinders.
8.5:1 compression ratio dish volume is ideal for boosted engine builds.
Features Manley's cam and barrel skirt profiles to reduce cylinder wall wear.
Includes premium chrome moly wrist pins.

⚠️ 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 or upgrading their 1993-1999 Mitsubishi Eclipse, 2003-2006 Mitsubishi Lancer, 1993-1998 Eagle Talon, or 1993-1994 Plymouth Laser. The 85.5mm bore size is a +.5mm oversize, meaning they're designed to fit into a cylinder bore that's been honed to match. With a dish volume that results in an 8.5:1 compression ratio, these pistons are well-suited for boosted applications where you need to control detonation while still making good power.

Manley's signature cam and barrel skirt profiles are designed to reduce friction and wear on your cylinder walls, even under demanding conditions. They also use unique fixturing that allows them to machine the skirt and ring grooves in one operation, ensuring the ring grooves are perfectly square to the skirt. This attention to detail helps achieve a better ring seal, which translates directly into more power and improved engine efficiency. The set includes premium chrome moly wrist pins, and the exacting standards for ring lands and grooves further enhance that crucial ring seal.

This set is designed for serious engine builds and comes complete with the pistons, rings, and wrist pins needed to get your engine back together. Please note that these pistons are not CARB approved and cannot be shipped to California. Always refer to the manufacturer's installation instructions for proper fitment and assembly procedures.