How many spark plugs in a V6?
How many spark plugs are in a V6? Each cylinder needs at least one spark plug to ignite fuel, so most V6s have 6 spark plugs. Some engines use two spark plugs in each cylinder. Twin spark systems ignite the air/fuel mixture in the engine at wo locations, which helps with combustion. This lowers emissions, while helping with power delivery and fuel economy. Most modern Mercedes-Benz V6s use a twin spark system, so they have 12 plugs.