Skip to content

Free Shipping On Orders Over $250 No Code Needed!!

JE Pistons
×
  • ShopExpand
    • AutoExpand
      • All Piston Kits
      • JE Ultra SeriesExpand
        • Piston Kits
      • JE PistonsExpand
        • Piston Kits
      • SRP PistonsExpand
        • SRP Pro 2618
        • SRP Pro
        • SRP
      • AccessoriesExpand
        • Pro Seal Piston Rings
        • Wrist Pins
        • Locks
      • Merchandise
      • Clearance
    • PowersportsExpand
      • PistonsExpand
        • Ultra Series
        • Pro Series
        • Piston Kits
      • AccessoriesExpand
        • Rings
        • Locks
        • Wrist Pins
      • Merchandise
      • Clearance
  • Custom PistonsExpand
    • Piston Terminology
    • Standard Custom Piston Features
    • Piston Coatings
    • Custom Piston Order Form
  • ResourcesExpand
    • 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
  • AboutExpand
    • Careers
    • The History of JE Pistons
    • Contact Us
  • BlogExpand
    • Auto
    • Powersports
  • Auto
  • PowerSports
  • B2B Connect
Account
Login/ Sign Up
Facebook Twitter Instagram
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

Customer Service

Call 714-898-9763 or
Email [email protected]

Free Shipping

On Qualifying Orders over $250

Free Returns

30 Days on most items
(see exclusions)

Products

Shop Auto

Shop Powersports

Our Brands

History of JE Pistons

Race Winning Brands Family

Race Winning Brands Europe

Race Winning Brands APAC

Privacy Policy

Customer Service

Contact Us

Return Policy

Terms and Conditions

MRP Policy

Accessibility Statement

Have a Question?

Call us at 1-714-898-9763

California Consumer Privacy Act (CCPA) Opt-Out IconYour Privacy Choices
Notice at Collection
Facebook YouTube Instagram

Copyright © 2025 JEPistons All Rights Reserved. JEPistons Is Part Of The Race Winning Brands Family.

Review Cart

No products in the cart.

  • Shop
    • Auto
      • All Piston Kits
      • JE Ultra Series
        • Piston Kits
      • JE Pistons
        • Piston Kits
      • SRP Pistons
        • SRP Pro 2618
        • SRP Pro
        • SRP
      • Accessories
        • Pro Seal Piston Rings
        • Wrist Pins
        • Locks
      • Merchandise
      • Clearance
    • Powersports
      • Pistons
        • Ultra Series
        • Pro Series
        • Piston Kits
      • Accessories
        • Rings
        • Locks
        • Wrist Pins
      • Merchandise
      • Clearance
  • Custom Pistons
    • Piston Terminology
    • Standard Custom Piston Features
    • Piston Coatings
    • Custom Piston 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
    • The History of JE Pistons
    • Contact Us
  • Blog
    • Auto
    • Powersports
  • Auto
  • PowerSports
×