Last month's "How It Works" story gave you the basics of the four-stroke cycle, describing the motion of the intake and exhaust valves in relation to the piston moving up and down in the cylinder.

Variable valve timing and variable valve lift may sound similar, but they're entirely different. Here are the differences between them and how they work.

Last month we began a new series on the basic operation of the internal combustion engine. We realize that many of our readers may be new to the high-performance scene and do not fully understand the ...