Forged Piston Kit, 89.00mm Bore

The Wossner K9088D300 piston kit is engineered for high-performance applications, offering a durable and efficient upgrade for compatible Honda K20 engines, including those in the RSX Type S and Civic Type R models. Constructed from forged alloy, these pistons are built for increased strength and reliability in demanding conditions. They feature a bore size of 89.00mm, a piston size of 88.93mm, and a 22.00mm pin size. The compression ratio is stated as 12.3:1, designed to enhance combustion efficiency and overall engine performance. Wossner pistons are known for their optimized crown shapes and reduced reciprocating mass, contributing to improved throttle response. Installation guidelines from Wossner recommend specific clearances for pistons and rings, as well as details on exhaust oil hole drilling. Proper installation is crucial for optimal performance and longevity.