In the past decade or so, automakers have turned to downsized turbocharged engines—often with direct injection and higher ...

Can you really use a pencil to replace the inside of a spark plug? One intrepid group of experimenters decided to find out ...

Harley-Davidson’s Milwaukee-Eight engine carries four spark plugs across just two cylinders, a setup that strikes many riders ...

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, ...

Spark plugs are a key component of your gasoline engine, and they have a key role in the ignition process. How long can you ...

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 ...

The modern HEMI V8 isn't a hemi engine in the true sense of the word, and it uses two spark plugs per cylinder instead of one ...

Spark plugs might sound small and inconsequential, but neglecting to change them can have serious and expensive repercussions ...