Mazda patents a complex 6-stroke engine that generates hydrogen from gasoline, offering zero emissions and daily operation ...

Mazda has announced a new four-cylinder engine, the Skyactiv-Z. Set to replace the Skyactiv-G and Skyactiv-X engines, the Skyactiv-Z aims to build on Mazda’s commitment to high efficiency and low ...

Homogeneous charge compression ignition (HCCI) engines combine a diesel's torque and fuel efficiency with a gas engine's cleaner emissions. The HCCI technique has been a goal of automakers since the ...

Two-stroke engines have steadily fallen out of favor over the last 50 years or so. While they sport great power-to-weight ratios and are often much simpler mechanically than their four-stroke ...

The internal combustion engine, now more than 200 years old, will be with us for a long time to come yet. Powering more than 1 billion vehicles on the planet and almost 100 million new ones each year, ...

...or rather, that it even works at all. The weird combustion technology still needs a bit of fine-tuning before going into production, but the early prototype I drove ran surprisingly well. Antuan ...

Mazda will showcase at next month’s 2009 Tokyo Motor Show its next-generation of powertrain technologies, which include two new engines and an advanced automatic transmission. Grouped under the ‘SKY’ ...

Jon Wong was a reviews editor for CNET Cars. He test drove and wrote about new cars and oversaw coverage of automotive accessories and garage gear. In his spare time, he enjoys track days, caring for ...