Two-stroke? Forced induction? Compression-ignition-capable? That is many unexpected engine technologies combined into a single engine.

This two-stroke design implements the same idea, aiming to run in compression-ignition mode for efficiency while switching over to spark ignition under higher engine loads.

Two power strokes and two compression strokes per cycle. Generally, the biggest difference between a typical 4-stroke engine and the 6-stroke design is in the cam and valve timing.

Some engines use a spark to ignite their fuel, and others rely on compression. What does all of that mean? And how do the two kinds of engines differ?

Explore the history of two-stroke engines, from early adopters to their decline due to emissions regulations and advancing four-stroke tech.

A free piston internal combustion (IC) engine operating on high compression ratio (CR) homogeneous charge compression ignition (HCCI) combustion is being developed by Sandia National Laboratories to ...

The end result was a two-stroke engine that produced up to 200 horsepower per liter, nearly double what was previously possible—the most powerful engine ever at the time.

Research at West Virginia University has led to the development of a novel crankless reciprocating internal combustion engine. This paper presents a time-based model used to investigate the ...