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My VKontakte group for communication and helping each other with repairs https://vk.com/public201689399 Support the Yumani channel https://yoomoney.ru/to/41001906529641 and you can also find me on YouTube https://www.youtube.com/channel/UCptk... YandexZen https://zen.yandex.ru/id/5eb4616e4ca8... RUTUBE https://rutube.ru/channel/218705/ Telegram https://t.me/sto_134 VK group https://vk.com/public201689399 Perhaps the most significant distinctive feature of a spark plug for a different number of valves is the material that the manufacturer used to make its products. For example, if spark plugs for an 8-valve power unit are made of conventional materials, such as copper electrodes, then spark plugs for 16-valve systems are made of platinum and iridium. In addition, spark plugs for multi-valve power units have different thread lengths, as well as different sizes for different keys. For 16-valve spark plugs have a smaller key size for their extraction. Also, spark plugs for a different number of valves will differ in their cost price - 16-valve will cost more than 8-valve. However, there are cases when the cost of 8-valve exceeds the cost of 16-valve! The reason? It all depends on the manufacturer, offering different pricing policies, but at the same time different quality of workmanship. Spark plugs for a 16-valve engine, although this is not critical, are designed to work with high pressure. After all, in an injection engine, the pressure in the ramps develops up to 3.8 atm, but an 8-valve carburetor has 3.0 atm. The spark plug gap in the 16-valve is 1.1 mm, instead of 0.7-0.8 mm, which provides a stronger spark and, as a result, better combustion of the fuel-air mixture. As a result, more economical use of fuel resources by the power unit.