Inconel Exhaust Valve Single Groove Stem

The Supertech ST-AEVI-1103S is a high-performance Inconel exhaust valve engineered to enhance reliability and airflow in demanding VW and Audi engines. By carefully detailing the valve head and angles, Supertech minimizes turbulence and obstruction, thereby increasing airflow. This particular exhaust valve is crafted from Inconel, a premium nickel-based alloy known for its exceptional temperature distribution capabilities. This characteristic helps lower temperatures across the entire cylinder head, making it ideal for engines that experience very high exhaust gas temperatures, commonly found in large-frame turbo applications for both street and race use. The valve stem features a single-groove design, which, when paired with matching single-groove keepers (sold separately), provides a cushion for the lock and protects the valve stem from excessive movement. This design also restricts valve rotation, preventing accelerated wear often seen with factory triple-groove designs. Supertech valves are sold individually, requiring careful calculation for the correct quantity needed per engine. For example, 1.8T 20V engines typically require 8 exhaust valves, while 2.7T 30V engines require 12 exhaust valves. It is essential to order the correct amount of intake and exhaust valves as needed for your specific engine application. Additionally, valve stem seals are sold separately and are crucial for maintaining seal life on higher-output engines; 8 exhaust seals are typically required for 1.8T 20V engines and 12 for 2.7T 30V engines. The ST-AEVI-1103S is designed to fit a wide range of VW and Audi models equipped with 1.8T 20-valve (06A & 058) transverse and longitudinal engines, as well as Audi 2.7T 30-valve twin-turbo engines. Specific vehicle fitment includes models such as the VW Golf, GTI, Jetta, Passat, and Beetle, and the Audi A4, A6, TT, A3, S3, S4, and RS4 from various model years within the specified engine ranges.