Wossner Prelude Si H23 9:1 Compression Forged Piston Kit

Wossner Prelude Si H23 9:1 Comp Forged Piston Kit

The Wossner Prelude Si H23 9:1 Compression Forged Piston Kit is the ultimate internal upgrade for the non-VTEC H-Series engine. Designed specifically for the H23A1 and H23A2 powerplants, this kit is the perfect solution for owners looking to transition from naturally aspirated to high-boost turbocharging. By lowering the compression ratio to 9.0:1, Wossner provides the necessary thermal headroom and safety margin against detonation, allowing for more aggressive tuning and substantial power increases without compromising engine reliability.

Engineered for the demands of high-performance tuning, these pistons are forged from 4032-T6 high-silicon aluminium alloy. This specific material is chosen for its superior strength-to-weight ratio and low thermal expansion, ensuring a quiet operation even during cold starts. Each piston undergoes a rigorous manufacturing process that includes Wossner’s signature Moly-based skirt coating to reduce internal friction and mirror-polished crowns to eliminate hot spots. Whether you are building a fast-road Prelude or a dedicated track car, this kit provides the durability required for elite competition.

Key Performance Features

• Turbo-Optimised 9.0:1 Compression: Specially engineered to handle the increased cylinder pressures and heat of forced induction builds.

• 4032-T6 Forged Aluminium: Premium high-silicon alloy offers maximum structural integrity with low expansion rates for tighter clearances.

• Friction-Reducing Moly Coating: Advanced skirt treatment minimises parasitic drag and protects cylinder walls from scuffing under load.

• Mirror-Polished Crowns: Hand-finished to reflect heat and ensure an even flame front, preventing pre-ignition and carbon build-up.

• Complete Performance Kit: Supplied as a set of four, including high-strength gudgeon pins, precision rings, and heavy-duty circlips.

Technical Specifications

Why Choose Wossner?

Wossner is globally recognised as a pioneer in high-performance engine internals, with a heritage rooted in European motorsport and precision engineering. By owning and operating their own forging plant in Germany, Wossner maintains absolute control over the quality and consistency of their aluminium alloys. This vertical integration allows them to produce pistons that are lighter, stronger, and more thermally efficient than standard cast or mass-produced forged components. When you choose Wossner for your Honda H23 build, you are installing a product trusted by world-class engine builders to deliver podium-winning performance and daily-driver reliability.