What is the significance of the 81.5mm bore size and 9.8:1 compression ratio?

The 81.5mm bore is 0.5mm oversized from the stock dimension, which is common when rebuilding an engine to restore cylinder integrity or increase displacement slightly. The 9.8:1 compression ratio is a moderate increase over stock, designed to improve power and throttle response without requiring extreme octane fuel.

What materials are used in the construction of these pistons?

These pistons are forged from domestic 2618 alloy, a strong material suitable for high-performance applications. They also include premium chrome moly wrist pins for added durability.

Are these pistons compatible with all B16A engine variants?

This specific part number is listed for the B16A1, B16A2, and B16A3 engine codes found in the specified Honda Civic del Sol and Civic SI models. It's always best to confirm your exact engine code before ordering.

Specifications

Brand: Manley Performance
Part #: 603105-4
UPC: 807298027180

Manley 93-97 Honda Del Sol / 99-00 Honda Civic SI (B16A1-A2-A3) 81.5mm +.5mm Oversized Bore 9.8:1 Fl

Name: Manley 93-97 Honda Del Sol / 99-00 Honda Civic SI (B16A1-A2-A3) 81.5mm +.5mm Oversized Bore 9.8:1 Fl
Brand: Manley Performance
SKU: manley-performance-manley-93-97-honda-del-sol-99-00-honda-civic-si-b16a1-a2-a3-8-t14-5666
Price: 693.90 USD
Availability: BackOrder

$693.90

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Fits 1994-1997 Honda Civic del Sol. Manley forged pistons for B16A engines, featuring an 81.5mm bore and 9.8:1 compression ratio.

Key Features

Fits 1994-1997 Honda Civic del Sol and 1999-2000 Honda Civic SI.
Forged from domestic 2618 alloy for superior strength and performance.
Features an 81.5mm bore size, which is 0.5mm oversized from stock.
Designed for a 9.8:1 compression ratio.
Includes proven cam and barrel skirt profiles to reduce friction and wear.
Exacting standards for ring lands and grooves enhance ring seal and power.

⚠️ 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

Starting with the 2618 alloy forgings, these Manley pistons are built for serious performance in your 1994-1997 Honda Civic del Sol or 1999-2000 Civic SI. The 81.5mm bore size, which is 0.5mm oversized from stock, is paired with a 9.8:1 compression ratio, aiming to give your B16A engine a noticeable boost in power and responsiveness. These aren't just off-the-shelf parts; they're crafted with precision for enthusiasts who demand more from their engine.

Manley uses domestic 2618 alloy for these pistons, a material known for its strength and ability to handle the stresses of high-performance engines. You'll also find proven cam and barrel skirt profiles, which help reduce friction and wear on your cylinder walls while still generating substantial power. The ring lands and grooves are machined to exacting standards, which is crucial for achieving a solid seal and maximizing combustion efficiency. Each set includes premium chrome moly wrist pins, and Manley's unique fixturing process ensures the ring groove squareness to the skirt, a detail that matters for long-term reliability and consistent performance.

When rebuilding or upgrading your B16A engine, these pistons are a solid choice for their well-built construction and attention to detail. Keep in mind 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.