Achates -

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

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

Its inherently low NOx emissions allow for smaller, less expensive exhaust systems. Efficiency by the Numbers By removing the head, the engine drastically reduces

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: By removing the head

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