ZRP RODS – MITSUBISHI EVO 4-9 4G63 PISTONS SET

Mitsubishi 4G63 EVO 4-9 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-knock 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 available upon request”Blast Off Bronze” Thermal Barrier Coating”Stealth Black” Moly Side-Skirt and Under-Crown CoatingAdditional InformationApplication 2.0L 4G63Bore Sizes 85.00mm, 85.50mm, 86.00mmWeight 318, 320, 326Stroke 88.00mmCompensation Ratio 8.5:1/9.0:1OEM Compensation Ratio 8.8:1Compensation Height 34.87mmRod 150.00mmPin Diameter 22.00mmDeck Clearance -0.13CCS Dome -12.40cc, -13.20cc, -14.00ccRing Set 21-GNH8500, 21-GNH8550, 21-GNH8600Wrist Pin Pn WP122