Nissan brought the first, and only, variable-compression engine to market. But its future doesn't look bright.

Increasing an engine’s compression ratio is a proven way of unlocking extra horsepower, but there’s a point of diminishing returns. The team at Garage 54, the Russian mechanics who built a V16 ...

Nissan's next-gen hybrids will get a brand-new engine, and the Japanese automaker isn't holding back on the tech innovations.

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?