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 ...

The four-stroke engine has dominated internal combustion for more than a century, but a British engineering firm is ready to topple that technology with what it calls a 150-horsepower "five-stroke ...

[Huib Visser] built this glass cylinder four-stroke engine and he took great care to make it beautiful. We don’t need our projects to be polished and gleaming, but we have to admit that this the ...

Plus, if you want to go faster, you've got to understand how engines work. Cars are, with the exception of rotaries, powered by the Otto four-stroke engine cycle. The name stems from the power ...