TECHNOLOGY

Opposed Piston Engine Achieves Ultra-low NOX Emissions

Achates Power has produced an engine that satisfies the extremely tight NOX emission limit set forth by the California Air Resources Board for 2027 and beyond. The company’s opposed piston 10.6L engine measured 0.02 g/bhp-hr NOX over the FTP test cycle in its most recent testing. The engine still has yet to demonstrate its ability to comply with CARB’S low NOX limits over the low load cycle (LLC), but things look good so far. In addition to its low NOX emissions, the Achates Power engine emitted just 422 g/bhp-hr CO2 during the Supplemental Emissions Test (SET) cycle, which is lower than both the current EPA standard (460 g/bhphr) and the 2027 number of 432 g/bhp-hr.