What is the purpose of the 1.100 inch boss span?

The boss span refers to the distance between the wrist pin bosses on the piston. A larger span, like the 1.100 inches on these pistons, indicates a stronger design intended to handle higher cylinder pressures and stresses, common in performance engine builds.

What kind of engine builds are these pistons best suited for?

These heavy-duty forged pistons are well-suited for performance-oriented K20A engine builds. The 10.5:1 compression ratio makes them versatile for naturally aspirated or forced induction applications where pump gas is used.

Are these pistons compatible with stock connecting rods?

While these pistons are designed for performance builds, compatibility with stock connecting rods depends on the specific rod's design and the overall engine build strategy. It is highly recommended to consult with your engine builder to ensure proper component matching and installation.

Carrillo Forged Piston Set SC81401-4 - Acura/Honda K20A

Name: CP Pistons Acura/Honda, K20A, 86.5mm, 10.5:1 Heavy Duty (1.100 boss span)
Brand: Carrillo
SKU: carrillo-cp-pistons-acura-honda-k20a-86-5mm-10-5-1-heavy-duty-1-100-boss-span-t14-837871
Price: 1024.00 USD
Availability: BackOrder

CP Pistons Acura/Honda, K20A, 86.5mm, 10.5:1 Heavy Duty (1.100 boss span)

$1024.00

On Backorder

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

Carrillo forged piston set for Acura/Honda K20A engines. 86.5mm bore, 10.5:1 compression ratio.

Key Features

Fits Acura/Honda K20A engines.
86.5mm bore size for increased displacement.
10.5:1 compression ratio is suitable for various engine builds.
Heavy duty construction with a 1.100 inch wrist pin boss span for added strength.
Forged aluminum alloy construction for durability.
Not CARB approved; cannot ship to California.

This piston set is designed for Acura/Honda K20A engines. Please verify compatibility with your specific engine application before purchase.

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Product Details

Forged from high-strength aluminum alloy, these CP Pistons are built for demanding K20A engine builds. The 86.5mm bore size is a common upgrade for increasing displacement, and the 10.5:1 compression ratio is a solid choice for naturally aspirated or forced induction setups where pump gas is still a consideration. The 1.100 inch boss span on the wrist pin bore indicates a robust design intended to handle significant stress.

Carrillo is well-known for making strong internal engine components. These pistons feature a heavy-duty construction, meaning they are designed to withstand higher cylinder pressures and temperatures than stock pistons. This makes them a popular choice for enthusiasts looking to build a more powerful and reliable engine, whether for track use or spirited street driving. The specific forging process and material selection contribute to their durability and performance under load.

When rebuilding your K20A engine, using a set of quality forged pistons like these from CP Carrillo is a critical step for ensuring longevity and performance. They are designed to work with performance connecting rods and will require proper balancing and installation by a qualified engine builder. Please note that these pistons are not CARB approved and cannot be shipped to California.