JE Pistons Ultra Series Nissan SR20DET 86.5mm Bore 8.5:1 CR Set of 4 Pistons

If you're building a high-performance Nissan SR20DET engine, especially one that's going to see significant boost, JE Pistons' Ultra Series forged pistons are a solid choice. These aren't your average replacement pistons; they're designed from the ground up to handle the extreme cylinder pressures that come with serious power adder builds. With a bore size of 86.5mm and a compression ratio of 8.5:1, they're specifically made for the SR20DET engine.

What sets these Ultra Series pistons apart is JE's proprietary Aligned Grain Flow forging technology. This in-house process maximizes the tensile strength of the aluminum, giving these pistons the toughness needed for high-horsepower applications. They also come loaded with custom-level features you'd typically only find on a fully custom set. This includes a thermal barrier crown coating, which helps reflect heat back into the combustion chamber, keeping piston crown temperatures down and improving exhaust scavenging. The skirts are coated to reduce friction and wear against the cylinder walls, which also helps quiet down operation, especially when the engine is cold. Plus, they feature lateral gas ports to help maintain a strong ring seal even at high RPMs and under heavy boost, ensuring consistent power delivery.

JE Pistons also includes high-strength, thick-wall wrist pins made by Trend Performance, built to withstand the demands of performance engines. The pin oiling is optimized to keep the pin, bores, and small end well-lubricated, reducing heat and wear. Every feature on these pistons is geared towards high-horsepower racing engines, and they are proudly made 100% in the USA. Keep in mind these are not CARB approved and cannot be shipped to California.