Achates -

By removing the head, the engine drastically reduces heat loss.

There are no valves, camshafts, or rocker arms. Achates

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 By removing the head, the engine drastically reduces

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: Achates Power , a San Diego-based engineering firm

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: