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.

The job of a camshaft is to open and close the valves at the proper time to fill the cylinders before combustion and vacate them afterward. That sounds simple, but how this job is accomplished greatly ...

When the function of a camshaft(s) is explained to non-mechanically-inclined types, it's sometimes referred to as the "brain" of an engine. Most engines will live their entire lives with the stock cam ...