In olden times, part of the ritual of changing your engine's spark plugs was making sure that the gap was set correctly for optimum performance. That is, the distance between the spark plug's center ...

Spark plugs that haven't been changed for a long time can become one with the cylinder head. Fortunately, it's possible to repair damaged threads instead of scrapping the head. (Photograph by Chris ...

Gasoline internal combustion engines need three fundamental things: fuel, oxygen, and spark. The sexy aspects of modifying cars are focused on the first two elements: Double Pumper carburetors, ...

A gas engine needs fuel, air, and spark to get its internals chugging along. Take any of these out of the equation and the engine will have a fit. While the automotive industry shifts toward fully ...