Free-piston engines represent a class of internal combustion machines distinguished by the absence of a crankshaft mechanism, enabling variable stroke length and compression ratio, with the piston’s ...

Converting the ignition of a fuel-air mixture into usable mechanical energy lies at the core of a dizzying number of internal combustion engines developed over the course of more than century.

We've seen some bonkers engines in our day, and truth be told, this three-cylinder diesel isn't the strangest of the lot. There are plenty of inline three-pots out there, but actually, this is an ...

Flat engines are horizontally-opposed piston engines, and this group includes Boxer engines, but not opposed-piston engines like the Cummins 14.3L Advanced Combat Engine (ACE) designed to power tanks.

There's more to piston shapes than you might think. Whether it's domed, flat, or dished, all pistons have their fair share of pros and cons when it comes to performance and efficiency. Understand that ...