A fundamental difference between gasoline and diesel engines is that a gasoline engine uses spark ignition while a diesel engine uses compression ignition. Before we delve deeper, let's understand ...

Compression ignition engines are more efficient than their spark-ignition counterparts because diesel fuel contains more energy by volume than gasoline.

Diesel engines don’t have spark plugs; instead, they use the super-heated air created by their high compression ratios to ignite the diesel fuel as it’s injected into the cylinder.

Compression ignition is how diesel engines run. A diesel sprays fuel and highly compressed hot air into the combustion chamber to induce an explosion, rather than igniting the fuel-air mixture ...

A Reactivity Controlled Compression Ignition engine can achieve 60 percent thermal efficiency. That's incredible.

Gasoline and diesel engines work on similar principles, but there are some important differences, including the fact that diesel engines don't need spark plugs.

A homogeneous charge compression ignition (HCCI) gasoline engine has been something of a holy grail for internal combustion engineers for decades, promising the fuel economy of diesel engines but ...

Unlike spark-ignition gas engines or compression-ignition diesel engines that have a combustion process characterized by growth of a flame front from a single point in the combustion chamber, HCCI ...

Hyundai today revealed that it is currently testing a new compression-ignition gasoline engine that is expected to be more efficient than an equivalent diesel. The new Hyundai 1.8-liter inline ...

Well that’s exactly what Mazda has done. In the ranges where compression-ignition isn’t possible, the SkyActiv-X engine runs like any other gasoline engine.

Infiniti has a variable compression ratio engine, but Mazda has a different solution. It's set to release the first commercial compression-ignition gasoline engine, dubbed SkyActiv-X.

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?