J.E. Pistons 379455 FSR Ultra Series Piston Kit - Standard Bore 93.00mm, 10.5:1 Compression

Bore: 93.00mm
Compression: 10.5:1 Compression
Sizing: Standard Bore

In-house forging has allowed JE to develop proprietary Aligned Grain Flow Technology forging technology that directs the grain flow of the aluminum to flow around critical areas of the piston, increasing strength. Lateral gas ports channel combustion gases to the back of the top ring groove, which adds pressure behind the compression ring to keep it pushed against the cylinder, providing improved and more consistent ring seal, critical in boosted applications. Ultra-thick ring lands aid in maintaining ring stability in forced induction and high-horsepower N/A engines, contributing to consistent ring seal and consistent power. Thermal Barrier Crown Coating - a ceramic coating on the piston crown - greatly reduces heat transfer into the piston material, decreasing fatigue and improving longevity. Tuff Skirt - a proprietary, moly-based dry film skirt coating is applied in-house and reduces operating friction for better wear resistance. Accumulator groove provides additional volume to trap unwanted gases below the top ring to keep pressure low and ring seal and performance high. Double pin oilers - two oil channels feed into the pin bore to maintain proper lubrication to improve wrist pin and pin bore wear resistance. Includes upgraded 9310 wrist pins: stronger, thicker wrist pin material is designed to withstand additional loads of forced induction applications. Sold as a complete kit with all necessary pistons, rings, wrist pins and wire locks under one part number.

Vehicle Fitment:

2020-2022 Polaris General XP 1000 Deluxe
2022 Polaris General XP 1000 Deluxe Ride Command Edition
2021 Polaris General XP 1000 Factory Custom Edition
2023 Polaris General XP 1000 Premium
2021 Polaris General XP 1000 Pursuit Edition
2023 Polaris General XP 1000 Sport
2022 Polaris General XP 1000 Trailhead Edition
2022 Polaris General XP 1000 Troy Lee Designs Edition
2023 Polaris General XP 1000 Ultimate
2018-2020 Polaris RZR RS1
2020-2021 Polaris RZR XP 1000
2015-2019 Polaris RZR XP 1000 EPS
2015 Polaris RZR XP 1000 EPS Desert Edition
2019 Polaris RZR XP 1000 EPS DYNAMIX Edition
2015 Polaris RZR XP 1000 EPS Fox Edition
2017 Polaris RZR XP 1000 EPS Gold Matte Metallic LE
2015-2019 Polaris RZR XP 1000 EPS High Lifter Edition
2014 Polaris RZR XP 1000 EPS LE
2018-2019 Polaris RZR XP 1000 EPS Ride Command Edition
2018-2019 Polaris RZR XP 1000 EPS Trails and Rock Edition
2017 Polaris RZR XP 1000 EPS Velocity Blue LE
2020-2022 Polaris RZR XP 1000 High Lifter
2020 Polaris RZR XP 1000 Limited Edition
2020-2023 Polaris RZR XP 1000 Premium
2022-2023 Polaris RZR XP 1000 Sport
2020-2022 Polaris RZR XP 1000 Trails & Rocks
2023 Polaris RZR XP 1000 Ultimate