Most of us think of a salon shampoo as a moment of relaxation, when we get to lean back and let the stylist wash and rinse our hair. But for a very small number of people, that innocuous posture can ...

Scientists want to know more about how an inexpensive, low-risk treatment may improve recovery from the most deadly type of stroke. The treatment, remote ischemic conditioning, or RIC, involves ...

Mazda has never been afraid of some truly odd engine designs. It keeps trying to make the Wankel work. It has a gas engine with compression ignition. And the company has made 14:1 compression gas ...

Wait! Don't say anything. Okay—they're gone. I didn't want those guys to hear what we were saying about them. Who? The people who flipped past this article without reading it, of course! You see, ...

The Mazda CX-90 feels like a bona fide luxury SUV, but the company's current upmarket push isn't its first. At one time, Mazda was actually going to launch its own luxury sub-brand, and it would bring ...

Mazda's willingness to leave the Otto cycle behind when designing its engines brought us the rotary-powered RX-7 and RX-8, ...

You'd think that the pistons listed for a 10.5:1 compression ratio would actually give you 10.5:1. But it's usually not that simple. Perhaps that's why so many four-wheelers have a foggy or incomplete ...

A flywheel is a heavy disc attached to the end of a rotating shaft that helps smooth out the engine’s power pulses and store energy through rotational momentum. Related: What Is a Misfire and What ...

If you often build, rebuild, or are just plain curious about optimizing the power from your engine, this subject is required readingand critical to producing race-winning horsepower. Simply stated, ...

A refrigeration or air conditioning system that is experiencing leaky valves or worn rings may be the most challenging troubleshooting scenario a technician will experience. That’s because a varying ...

Any oddball engine is clickbait crack for mechanical nerds, and the most compelling ones purport to introduce an entirely new combustion concept. "Not a four-stroke, not a two-stroke, a revolutionary ...

Some of the most iconic motorcycles of all time don't come equipped with electric starters. If you want to take them for a ride, you will have to start them the old-fashioned way, by kickstarting them ...