Read a good spark plug lately? We hope so, for your engine's sake. But spark plug reading—the traditional way to check your fuel mixture and monitor other vital conditions in the combustion chamber ...

Simply put, getting the maximum power from any race engine is a function of the temperature, pressure and timing of combustion gases in the cylinder. Since it would be expensive and impractical for ...

Worn spark plugs can really hurt performance and fuel economy. Here's how to tell if it's time to replace them to keep your ...

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