ZRP RODS – PISTONS SET SUBARU 2.0L EJ20 WRX-STI CRANK 79.0

Subaru EJ20/EJ205 pistons are designed for light to high-performance tuning, primarily for road racing or club racing cars looking to develop their engines for high mileage and/or street use. Designed by ZRP engineers and manufactured in Germany from a high-silicon, low-expansion 4032 (T6) alloy. This allows the engine builder to use a closer piston-bore clearance, resulting in better sealing. This minimizes the slapping noise during cold starts, common among engines using forged pistons, ensuring quiet operation and low oil consumption.
We chose a full-round skirt design with a lower reinforcing band, with oversized and deeper valve pockets to allow the use of high-lift camshaft profiles. They have offset pins for quiet operation, and the wrist pins are made of 9310 alloy. Other features include anti-detonation grooves to protect the first rings, and a gas pressure accumulator groove for improved ring sealing and vibration reduction. A pack of premium Japanese-quality 1.00 mm x 1.20 mm x 2.80 mm rings is included.Product Features and DesignAnti-knock grooves for long life and high performanceGas pressure accumulator groove in the second ring for increased wear resistance.Horizontal slots in the pin hole designed to allow oil to penetrate between the pin and the pin hole area.Precision CNC machined ring groovesHigh-silicon/low-expansion 4032-T6 alloyHoned pin holesSide gas ports for improved ring sealingFull-round skirt with lower reinforcement band for high HP/boost applicationsValve pockets designed to accommodate oversized valves and high-revving camshafts liftPistons designed to optimize squish for longer engine life and increased power potentialOptional coatings offered upon request”Blast Off Bronze” Thermal Barrier Coating”Stealth Black” Moly Side-Skirt and Under-Crown CoatingAdditional InformationApplication 2.0L EJ20, 2.0L EJ205, EJ20/EJ205 WRX-STi (1998-UP) 79.00 mm crankshaft stroker.Bore Size 92.00MM, 92.50MMWeight 348 Gr.Stroke 79.00MMOffset Ratio 8.5:1OEM Offset Ratio 8.0:1Comp. Height 30.70mmAction 130.45 mmPin diameter 23.00 mmBridge Clearance -0.35CCS Dome -7.70CC, -8.60CCSet of rings 21-GNH9200, 21-GNH9250Wrist Pin Pn WP082