How many spark plugs in V8?
How many spark plugs are in a V8? Every cylinder needs one spark plug, so a V8 uses at least 8 plugs. Some engines use a twin spark system. This uses a pair of plugs, igniting fuel at two points inside the cylinder during the combustion cycle. This helps get complete combustion, improves fuel economy, emissions and power. It also provides space for larger valves in engines with two valves per cylinder. Modern V8 engines with 16 spark plugs include Chrysler’s HEMI V8s and Ford’s 6.2 liter V8.