Copper spark plugs are affordable and widely available, but iridium spark plugs bring their own set of advantages. Here's ...

Spark plug indexing won't make much of a difference in your average stock car, but it can have a noticeable impact in high-rpm performance builds.

Like much in life, the difference between detonation and pre-ignition, and their effects, comes down to timing. Both refer to a situation when an engine's fuel/air mixture combusts at the wrong time, ...