2018 Detroit auto show: Achates Power OP engine begins real-world test phase

In 2016, Achates Power received a $9 million award from the U.S. Dept. of Energy's ARPA-E program to develop its opposed-piston gasoline compression ignition (OPGCI) engine. Through Achates' recently-announced partnership with Aramco, the engine has entered the in-vehicle development phase and is now fitted to Ford F-150 demonstrators, revealed at the 2018 North American International Auto Show.

The OP design aims to achieve fuel economy levels beyond regulatory requirements with lower emissions and cost, compared with current production engines.