You may have heard your car has a four-stroke engine, but you're not sure what that means. Why are there four? And what is a stroke, anyway? A modern gas engine most commonly uses pistons and a ...

Almost all gasoline engines, whether they're efficient-yet-less-refined four-cylinders, high-horsepower V6s, or growly and torque-rich V8s, use much the same process to create power. The "Otto cycle" ...

Add Yahoo as a preferred source to see more of our stories on Google. Almost all gasoline engines, whether they're efficient-yet-less-refined four-cylinders, high-horsepower V6s, or growly and ...

If you race motocross, you might wish that two-strokes would make a comeback. They’re generally cheaper to maintain, easier to work on and are lighter than their four-stroke counterparts. And, thanks ...

If you race motocross, you might wish that two-strokes would make a comeback. They’re generally cheaper to maintain, easier to work on and are lighter than their four-stroke counterparts. And, thanks ...