Combustion engine valvetrains have evolved over time. While flathead and overhead valve designs were more popular in the past, most modern engines run overhead cam designs. Three common combustion ...

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.

It seems, for the modern American production car. that the 'L' head engine is a thing of the past. Present design trends indicate that the few remaining flathead engines now in production will be ...

General Motors’ all-new 3.9L V6 has been honored with a Breakthrough Technology award by Popular Mechanics for its innovative use of variable valve timing in an overhead valve engine. For ages GM has ...

The year 1996 had a lot of Mustang enthusiasts scratching their heads. The body of their beloved ponycar looked the same, but under the hood was something quite unfamiliar. It was the debut of the ...