09/01/2026
Four JE forging styles. Four different load paths. Which one matches your power goals?
Full Round — Maximum skirt rigidity and broad bearing area for high side‑load and elevated cylinder pressure. The strongest for most cases.
FSR — Narrow skirts + shorter pin bosses for reduced friction and rotating weight. Lightest, yet least rigid forging option for most.
FSR‑Internal — Internal ribbing stiffens the crown and pin bosses for high‑pressure, high‑RPM durability. Good middle ground between FSR and Full Round.
FSR‑External — External reinforcement boosts lateral skirt stiffness without the added mass of a full‑round design. Strong without sacrificing rotating weight.
Remember folks, power starts at the piston. With thousands of race miles logged in the most demanding applications like NASCAR, NHRA Pro Stock, Indy Car and more, each design chooses best FSR design to provide the ultimate combination of low-friction, lightweight design with increased stability and strength.
👉 Shop your set of FSR pistons at jepistons.com today.