Achates Link

There are no valves, camshafts, or rocker arms.

The primary draw of Achates technology is a "step-function" improvement in efficiency. By combining a two-stroke cycle with the opposed-piston architecture, the engine achieves: Achates

Its inherently low NOx emissions allow for smaller, less expensive exhaust systems. Efficiency by the Numbers There are no valves, camshafts, or rocker arms

By removing the head, the engine drastically reduces heat loss. Efficiency by the Numbers By removing the head,

In the rapidly evolving landscape of sustainable transportation, an architecture from the 1930s is making an unexpected and powerful comeback. Achates Power , a San Diego-based engineering firm founded in 2004, has spent over two decades refining the , transforming a historic design into what they claim is the cleanest and most efficient internal combustion engine (ICE) demonstrated to date. A Radical Departure from Convention

Unlike a standard engine, the Achates design features two pistons per cylinder moving toward each other, meeting in the center for combustion. This "head-to-head" arrangement eliminates several of the most complex and failure-prone parts of a traditional engine, including:

The Second Coming of the Opposed-Piston Engine: A Look at Achates Power