A car typically has one spark plug per engine cylinder. Therefore, the number of spark plugs corresponds directly to the number of cylinders in the engine:
- A 4-cylinder engine usually has 4 spark plugs.
- A 6-cylinder engine (such as a V6) has 6 spark plugs.
- An 8-cylinder engine (such as a V8) has 8 spark plugs.
Some engines, especially high-performance or certain modern designs, may have two spark plugs per cylinder to improve combustion efficiency, which would double the number of spark plugs accordingly. For example, some V6 engines with twin spark systems have 12 spark plugs (2 per cylinder) instead of 6
. In summary, most cars have as many spark plugs as cylinders, with 4 being the average for typical vehicles
