Piston Ring Set 3.189 1.0 1.2 2.8mm

The JE PISTONS Piston Ring Set 3.189 1.0 1.2 2.8mm (Part No. JG1004-3189) is a precision-engineered ring kit designed for high-revving, small-displacement four-cylinder engines in the sports compact category. This file-fit ring set delivers optimized compression and blow-by control through a low-tension design that reduces friction while maintaining reliable sealing across the full RPM range typical of tuned four-cylinder applications.

The 3.189-inch bore diameter accommodates most modern compact performance engines, while the 1.0 x 1.2 x 2.8mm ring geometry represents a balanced approach to gas sealing and mechanical efficiency. Nitride coating on the steel construction provides superior wear resistance and extends ring life in both naturally aspirated and forced-induction contexts. Low-tension design reduces parasitic losses on the crankshaft, translating to measurable gains in fuel economy and horsepower retention in efficiency-focused builds. File-fit rings require honing to achieve precise cylinder wall contact and optimal ring-to-bore clearance—a standard practice in competition and high-performance engine assembly.

This ring kit is engineered for builders and enthusiasts restoring or modifying four-cylinder engines where ring selection directly impacts compression ratio stability, oil consumption, and power delivery. Ideal for street performance, weekend racing, or engine rebuilds that demand precision OEM-equivalent or aftermarket-specification components. JE PISTONS' focus on bore-specific fitment ensures that selecting the correct bore diameter is critical—verify your engine's bore measurement before ordering.

Complete ring kits for modern compact engines balance cost efficiency with performance targets that suit both stock rebuilds and mild modifications. The nitride finish and low-tension design of this set signal JE PISTONS' attention to durability and efficiency—qualities valued in competitive engine building where ring durability and minimal friction contribute meaningfully to final power output and reliability.