Wossner Civic B16A 9.0:1 Forged Piston Kit The Wossner Civic B16A 9.0:1 Forged Piston Kit is the definitive choice for Honda enthusiasts building high-performance B-Series turbo engines. By reducing the static compression ratio to 9.0:1, these pistons significantly increase the "knock window," allowing for higher boost levels and more aggressive ignition timing safely. Precision-forged in Germany, they provide the thermal stability and structural strength required to transform the high-revving B16A into a forced-induction powerhouse capable of sustained high-RPM track use. Every piston is crafted from 4032-T6 high-silicon aluminium alloy, chosen for its low thermal expansion properties and exceptional resistance to fatigue. Wossner’s advanced manufacturing process includes a signature Moly skirt coating to reduce internal friction and a mirror-polished crown to eliminate the hot spots that lead to detonation. Whether you are aiming for a reliable 300bhp street build or a dedicated drag racer, these pistons deliver the durability and precision clearance necessary for elite engine performance. Key Performance Features Turbo-Ready 9.0:1 Compression: Engineered to lower compression for safer, more efficient turbocharging and high-boost applications. Low-Expansion 4032-T6 Alloy: Allows for tighter piston-to-bore clearances, reducing cold-start "piston slap" and extending engine life. Advanced Moly Skirt Coating: Minimises friction and provides a layer of protection against scuffing during extreme operating conditions. Mirror-Polished Crowns: Designed to reflect heat back into the combustion chamber and prevent carbon buildup or detonation-inducing hot spots. Complete Professional Kit: Includes four forged pistons, a high-performance Japanese ring set, gudgeon pins, and heavy-duty circlips. Technical Specifications Feature Specification Engine Code Honda B16A / B16A1 / B16A2 Bore Size Options 81.00mm (Std) / 81.50mm / 82.00mm / 83.00mm Compression Ratio 9.0:1 (Turbo / Low Compression) Compression Height 29.85mm Stroke 77.40mm Pin Diameter 21.00mm Dome Volume -2.7cc Material 4032-T6 Forged Aluminium Kit Part Number K9425 (Series) Why Choose Wossner? Wossner is globally renowned for its pioneering work in motorsport forging technology, drawing on decades of experience in Formula 1 and World Rally Championship engineering. By controlling the entire manufacturing process—from the initial forging in their own facility to the final precision machining—Wossner ensures a level of quality and consistency that mass-produced alternatives cannot match. When you choose Wossner for your Honda B16A, you are choosing a product designed to withstand the brutal stresses of competition while maintaining the refined operational noise levels required for fast-road use.
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