NGK spark plugs have been igniting since the 1930s. But sparks don’t just simply ignite. It takes a high amount of precision to create spark plugs that perform well and are extremely resistant in doing so.
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This video explains the electrode wear of spark plugs, especialy the difference between single spark and wasted (double) spark systems. It shows in detail why in double spark ignition systems, spark plug electrode wear is different on some cylinders.
Everything you need to know about the precious ignition part