You've probably heard about the three "stages" of tuning, but what do they mean? And is there any standard definition for ...

Positive Crankcase Ventilation—three dirty words, but do they really need to be perceived that way? In general, the PCV system has two main functions: vapor relief and liquid separation. PCV systems ...

A Note from Jim: The stated objective of this story is to introduce you to some notions that may be of imme-diate help to circle track engines operating under rules that allow non-OEM parts. It is ...

A novel intake manifold design shares pressure between both banks of the engine, giving it more consistent performance.

There's no disputing that a decent shaker hood is a stylish item that helps a performance car stand out, but it's more than that. A shaker hood also provides a minor performance gain over a stock ...

Ask any Vette owner to choose between two particular performance components, and chances are he'll opt for the one that makes more power. While this logic may appear sound prima facie, the reality is ...

Specifically, an internal-combustion engine is a heat engine in that it converts energy from the heat of burning gasoline into mechanical work, or torque. That torque is applied to the wheels to make ...

The ubiquitous Chrysler 4.0L inline-six was (and is) perhaps one of the best engines ever offered in a 4x4. Depending on chassis and model year, these engines carried a net power rating of 173-195hp ...

Among internal combustion engines, diesel engines boast excellent thermal efficiency and can burn fuel that is not highly refined. They use a compression ignition system in which intake air is ...