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.

Virtually all current production-based cylinder heads incorporate a cross-flow design with intake ports (Photo B) located on one side of the head and exhaust ports (Photo C) on the opposite side. Some ...

Camshafts are simple devices, but important ones. Modern engines can have one or more intake and exhaust valves, and it's the camshaft's job to open valves precisely as the engine runs, supplying the ...

Rocker arms are an essential part of overhead valve engines. But how essential is it to keep track of whether they're made ...