Wossner Civic D16Z6 / Z7 / Z9 9:1 Comp Forged Piston Kit

Wossner Civic D16Z6 / Z7 / Z9 9:1 Comp Forged Piston Kit

The Wossner Civic D16Z6 / Z7 / Z9 9:1 Compression Forged Piston Kit is the ultimate foundation for high-boost SOHC VTEC builds. Specifically designed for the 1.6L D-Series engine found in the Civic Si, EX, and Del Sol, this kit provides a strategic reduction in compression from the factory 9.2:1 to a turbo-optimised 9.0:1. This lower ratio significantly expands the tuning window, allowing for higher boost pressures and more aggressive ignition timing while maintaining a vital safety margin against engine-damaging detonation.

Each piston is precision-forged in Germany from high-silicon 4032-T6 aluminium alloy, chosen for its superior strength and low thermal expansion properties. This allows engine builders to set tighter piston-to-bore clearances, resulting in a quieter engine during cold starts and reduced oil consumption compared to other forged alternatives. To further enhance performance, Wossner applies a signature Moly-based skirt coating to reduce internal friction and mirror-polishes the crowns to reflect heat and eliminate sharp edges that can lead to pre-ignition.

Key Performance Features

• Turbo-Optimised 9.0:1 Compression: Engineered to handle the increased thermal and cylinder pressures of forced induction.

• 4032-T6 Forged Alloy: High-silicon content provides incredible structural integrity with minimal expansion for a quieter build.

• Advanced Moly Skirt Coating: A permanent dry-film lubricant that reduces parasitic drag and protects cylinder walls from scuffing.

• Mirror-Polished Crowns: Hand-finished to reflect heat back into the combustion chamber, preventing hot spots and carbon buildup.

• Complete Professional Kit: Supplied as a set of four, including high-performance Japanese ring sets, gudgeon pins, 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 D16 build, you are installing a product trusted by world-class engine builders to deliver podium-winning performance and daily-driver reliability.