The requirement to gap spark plugs might not be as common as it once was, but it's still an important bit of maintenance on ...

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, ...

In racing, spark plugs are practically a disposable commodity. Use them for a while and throw them away. If the engine starts acting funny, replace the plugs just in case. It's cheap insurance and ...

Almost always, a gasoline engine uses compression, fuel, air and a spark supplied by a spark plug to ignite combustion in a cylinder. Most modern engines use a compression ratio of about 9.5:1, but ...