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?

HCCI engines have a compression ratio of 12:1 (similar to that of a conventional direct-injected gas engine), so they can run on regular pump gas and E85.

What is compression ignition? Compression ignition basically is the term that is used for describing the manner in which diesel engines function.

Called combustion ignition (when it’s done on purpose), that sparkless combustion is central to Mazda’s newest engine. Compression ignition is how diesel engines run.

What exactly is Spark Controlled Compression Ignition? SpCCI is a natural progression of Mazda’s Skyactiv programme, which it embarked on in 2011 when it launched petrol and diesel engines ...

Mazda has detailed the next-generation of its SkyActiv engine family, which will feature innovative compression ignition technology.While the new SkyActiv engine is still under development, Mazda ...