For hot rodders, spark plugs are often nothing more than inspection tools that reveal whether an engine is running too rich, too lean, or just right. Street guys look for a nice tannish-brown tint on ...

Bruce Springsteen said it best when he said, "You can't start a fire without a spark." While spark plugs may not be number one on your conversation hit parade, there is a whole raft of new, "designer" ...

Spark plugs are necessary for gas-powered engines. However, they're not all the same, and they can come in different shapes ...

This is an extreme Champion racing spark plug once used in 15:1 NASCAR superspeedway motors with a radically cut-back side electrode. Spark plug manufacturers usually spot-weld side electrodes to the ...

Smart plugs can add controls to any outlet, but they aren’t perfect for everything. Here’s our guide to using one and which ...