Cars' engines have to resist tremendous pressure and heat up to 3,000 degrees. So what in the world is a soft, explosive ...

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.

The engines of yesteryear were pretty simple, with tappets clackity-clacking away on cam lobes, opening valves, and making a ruckus while doing it. Mechanical lifters were adequate for valve operation ...