JE Pistons Ultra Series Honda K20A 86mm Bore 10.0:1 CR Set of 4 Pistons

If you're building a high-horsepower Honda K20A engine, especially one intended for forced induction like turbocharging or supercharging, you need pistons that can handle extreme cylinder pressures. The JE Pistons Ultra Series are forged from 2618 aluminum, a strong material chosen for its ability to withstand high temperatures and stresses. These pistons are specifically designed for the demands of power-adder builds, ensuring they can keep up with the increased forces inside the cylinder.

What sets the Ultra Series apart are the custom-level features JE has incorporated. They use a proprietary Aligned Grain Flow forging process that maximizes the material's tensile strength, making them exceptionally robust. You'll also find a thermal barrier crown coating, which is a ceramic-based material that reflects heat away from the piston crown, helping to keep temperatures down and improve exhaust gas scavenging. For reduced friction and wear on the cylinder walls and piston skirts, a skirt coating is applied, which also helps quiet down operation, especially during cold starts. To maintain a solid ring seal even at high RPMs and under high boost, these pistons feature lateral gas ports. The included Trend Performance wrist pins are thick-walled and built for high-performance applications.

This set is for the Honda K20A engine, with an 86mm bore and a 10.0:1 compression ratio, making them a solid choice for many boosted K-series builds. Every feature on these pistons is optimized for high-horsepower racing engines, and they are proudly made 100% in the USA. Please note that these pistons are not CARB approved and cannot be shipped to California.