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JE Pistons

Home / Custom Pistons / Piston Terminology

Piston Terminology

Piston Terminology1 scaled
With over 300 individual forgings to choose from, JE is able to achieve specific piston design requirements while reducing overall weight.
SelfPiston Terminology1

FSR (Forged Side Relief) forging designs feature a reduced skirt width and shorter wrist pin when compared to traditional “full round” style forgings. The narrow skirt helps minimize piston contact with the cylinder wall that can cause friction and power loss while the shortened wrist pins reduces the overall weight. Some FSR forgings feature internal and external bracing to provide a more rigid construction while minimizing overall weight. With thousands of race miles logged in the most demanding applications like NASCAR, NHRA Pro Stock and Indy Car, these pistons provide the ultimate combination of low-friction, lightweight design with increased stability and strength.

SelfPiston Terminology2

FORGING OPTIONS

  • Full Round
    Round
  • FSR
    FSR
  • FSR W External scaled
    FSR W/ External
  • FSR W Internal
    FSR W/ Internal

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  • Shop
    • Auto
      • JE Ultra Series
        • Piston Kits
        • Single Replacement Pistons
      • JE Pistons
        • Piston Kits
        • Single Replacement Pistons
      • SRP Pistons
        • SRP Pro 2618
        • SRP Pro
        • SRP
      • Accessories
        • Locks
        • Pro Seal Head Gaskets
        • Pro Seal Piston Rings
        • Wrist Pins
      • Merchandise
    • Powersports
      • Pistons
        • Ultra Series
        • Pro Series
        • Piston Kits
        • Single Replacement Pistons
      • Accessories
        • Rings
        • Locks
        • Wrist Pins
      • Merchandise
  • Custom Pistons
    • Piston Terminology
    • Standard Custom Piston Features
    • Piston Coatings
    • Custom Pistons Order Form
  • Resources
    • Product Catalogs
    • Compression Calculator
    • Ring Installation Guide 2618 Pistons
    • Ring Installation Guide 4032 Pistons Instructions
    • Frequently Asked Questions (FAQs)
    • Combustion Chamber Mold Making Instructions
    • Racer Support
    • JE Pistons Dealers and Distributors
    • JE Pistons Logo Policy
  • About
    • Careers
    • Our History
    • Contact Us
  • Blog
    • Auto
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