Due to the advances in engine design, turbo efficiency and tuning, horsepower numbers have increased substantially over the years. In an ongoing effort to improve durability and performance, AMS has upped the ante once again. Working closely with ROSS pistons we have redesigned and strengthened our AMS EVO pistons.

Starting with a beefier forging we have added material where it counts most. In an effort to further reinforce our pistons’ to sustain the burden of extreme rpm’s and high horsepower we have made the following improvements shown in the pictures below:
• Added material around the pin boss to support stronger pin loads
• Added material in the transition between the pin boss and skirt for added strength
• Increased radius in the transition between the pin boss and skirt for added strength
• Wider side reliefs reducing weight to compensate for added material

In case the added strength wasn’t enough, we also raised the compression ratio to 8.9:1. Coupled with our specially designed quench area we take full advantage of engine modifications such as aftermarket cams, larger turbos, and other improvements of engine flow that benefit from a higher static compression.