The Subaru EJ engines seem to have caught the eyes of people building experimental light aircraft at home, but why are they ...

An opposed-piston free-piston engine is essentially two single-piston free-piston engines that have their pistons coupled together through a linkage. Like a more typical opposed-piston engine, an ...

Argonne, which is partnering with Achates Power to develop a hydrogen-powered engine, recently began testing the engine in Argonne’s state-of-the-art facilities. In a groundbreaking demonstration, ...