While an engine compression tester may not be the most common tool in a mechanic's garage, they can be very useful, especially for older cars.

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?

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 ...

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 ...