HKS 2.1L High Compression Stroker Kit

2013–2020 Subaru BRZ / 2013–2016 Scion FR-S / 2017–2020 Toyota 86 FA20 Engine

21004-AT002

Overview:

The HKS 2.1L High Compression Stroker Kit is a precision-engineered capacity upgrade designed exclusively for the FA20 engine found in Subaru BRZ, Scion FR-S, and Toyota 86 models from 2013 to 2020. Developed using extensive experience from D1 Drift and time attack events at Tsukuba Circuit, this kit embodies Japanese craftsmanship and engineering excellence. It is ideal for enthusiasts seeking to significantly enhance engine displacement and durability while supporting power outputs up to 550ps.

Whether you are building a naturally aspirated or forced induction setup, this stroker kit offers optimized internals that improve strength and reliability, making it a perfect foundation for high-performance builds.

Key Features:

This stroker kit combines advanced materials and design to deliver a robust upgrade for the FA20 engine:

• Carefully selected, specially forged piston kit crafted from high-quality raw materials for maximum strength and durability.
• Optimized compression ratio through rigorous strength analysis and testing, allowing flexibility for both naturally aspirated and forced induction applications.
• 3D-designed piston crowns engineered to complement the stock direct injection system for improved combustion efficiency.
• Short-height piston design reduces piston skirt overhang, minimizing friction and wear for enhanced engine longevity.
• High-strength I-beam connecting rods specifically designed to accommodate the longer 2.1L stroke without requiring block modifications.
• Special-size crank pins integrated to maintain block integrity and eliminate the need for machining or modifications.
• HKS forged crankshaft with a perfect pin journal size, meticulously balanced for maximum engine efficiency and smooth operation.
• Maintains the factory 86mm piston bore to preserve block strength and avoid costly boring, honing, or sleeving procedures.
• Capable of supporting power outputs up to 550ps, making it suitable for high-boost and high-performance engine builds.

Construction & Design:

Every component in the HKS 2.1L Stroker Kit is designed with precision and durability in mind. The forged pistons and connecting rods are manufactured using advanced forging techniques to withstand the stresses of increased displacement and power. The short-height piston design reduces friction and potential mechanical interference, while the 3D piston crown shape is optimized for the FA20’s direct injection system, ensuring efficient combustion and power delivery.

The forged crankshaft is carefully balanced and engineered to handle the extended stroke without compromising reliability. By retaining the stock bore size, the kit preserves the structural integrity of the engine block, allowing for a cost-effective installation without the need for additional machining.

Installation & Fitment:

This stroker kit is a direct upgrade for the FA20 engine in the following vehicles:

• Subaru BRZ (2013–2020)
• Scion FR-S (2013–2016)
• Toyota 86 (2017–2020)

Installation is straightforward as the kit is designed to fit the factory block without requiring boring, honing, or sleeving. Special-size crank pins eliminate the need for block modifications, and the kit includes a replacement head gasket suitable for both naturally aspirated and forced induction setups. No cutting, drilling, or special tuning is required to install this kit, making it a practical choice for performance upgrades.

What's Included:

• Forged pistons with optimized compression ratio and 3D piston crowns
• High-strength I-beam connecting rods designed for the longer stroke
• HKS forged crankshaft with extended 2.1L stroke
• Replacement head gasket compatible with NA and forced induction applications
• All necessary hardware for assembly

Ideal For:

This stroker kit is perfect for:

• Performance enthusiasts building high-output naturally aspirated or forced induction FA20 engines
• Track and drift drivers seeking increased displacement and durability
• Engine builders looking for a reliable, cost-effective upgrade without block modifications
• Owners aiming to maximize power potential while maintaining engine reliability