Wossner RSX Type-S & Civic Type-R K20 9.0:1 Compression Forged Piston Kit Hard Anodised

Wossner RSX Type-S & Civic Type-R K20 9.0:1 Compression Forged Piston Kit Hard Anodised

The Wossner K20 Hard Anodised Low Compression Piston Kit is the gold standard for high-horsepower forced induction builds. Specifically engineered for the K20A2, K20Z1, and K20Z4 engines found in the RSX Type-S and Civic Type R (EP3, FN2), this kit provides a strategic drop in compression to 9.0:1. This lower ratio is essential for managing the increased cylinder pressures of a turbocharger, providing a massive safety margin against detonation and allowing tuners to extract maximum power from the K-Series platform.

As part of the Wossner "Premium Plus" series, these pistons feature a professional Hard Anodised crown coating. This technical treatment creates a ceramic-like thermal barrier that reflects heat away from the piston substrate, protecting it from thermal distress and surface erosion during prolonged high-boost pulls. Furthermore, the anodising toughens the ring grooves, preventing "micro-welding" where the piston ring can fuse to the landing under extreme stress. This makes the kit the definitive choice for builders aiming for 500bhp and beyond.

Key Performance Features

• Turbo-Optimised 9.0:1 Compression: Allows for significantly higher boost pressures and more aggressive ignition timing on pump or race fuels.

• Hard Anodised Crown Coating: Provides a high-tech thermal shield that increases piston longevity and prevents surface melting under extreme heat.

• Anti-Micro-Welding Protection: Anodised ring lands ensure the rings remain free and functional, maintaining a perfect seal under heavy thermal loads.

• Low-Expansion 4032-T6 Alloy: High-silicon forged material allows for tighter piston-to-bore clearances and quieter cold-start operation.

• Moly-Coated Skirts: Signature Wossner permanent dry-film lubricant reduces parasitic drag and protects cylinder walls from scuffing.

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 K20 build, you are installing a product trusted by world-class engine builders to deliver podium-winning performance and daily-driver reliability.