Achates [ Confirmed ● ]

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

Its inherently low NOx emissions allow for smaller, less expensive exhaust systems. Efficiency by the Numbers Achates

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: By removing the head, the engine drastically reduces

There are no valves, camshafts, or rocker arms. By removing the head