JE Pistons Honda K20A2 Ultra Series 10.1 86.5mm Bore Piston Kit (Set of 4)

JE Pistons is well-known for making strong internal engine components, and their Ultra Series pistons are a prime example of that commitment. If you're building a high-horsepower Honda K20A2 engine, especially one intended for forced induction like turbocharging or supercharging, these pistons are designed to handle the extreme cylinder pressures that come with it. They are built with custom-level features right out of the box, making them a solid choice for serious engine builds.

What sets these Ultra Series pistons apart is JE's proprietary Aligned Grain Flow forging technology. This process, done entirely in-house, maximizes the material's tensile strength, which is crucial for withstanding the immense forces inside a boosted engine. You also get a thermal barrier crown coating, a ceramic-based material that reflects heat back into the combustion chamber, helping to keep piston crown temperatures down. This not only aids in preventing detonation but also helps with exhaust gas scavenging. For added durability and reduced friction, the piston skirts are coated, which also helps quiet down operation, especially during cold starts. The kit includes high-strength, thick-wall wrist pins from Trend Performance, designed specifically for the demands of power-adder builds, and features optimized pin oiling to ensure everything stays well-lubricated under stress. Lateral gas ports are included to help maintain a solid ring seal even at high RPMs and under significant boost, which is vital for consistent power delivery.

This kit is designed for a 3.406-inch bore, which is 86.5mm, and offers a 10.00:1 compression ratio with its dome design. Every aspect of 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.