More completely in the combustion chamber. The claim behind these devices is that they introduce fuel into the engine in a more burnable state. Beyond the question of whether these devices actually can change the composition of fuel, the idea of making fuel burn faster or better is a bit of a stretch. The fuel burn in most modern cars is optimized to the point where only a small percentage of the injected fuel leaves the engine without being ignited. Another factor to consider is that devices such as vapor injectors are essentially overridden by the engine's computer. Adding extra fuel through a vapor injector can cause the engine to reduce fuel flow from its injectors. Still others claim they coat engine parts, reducing friction and extending engine life. It's hard to lump all of these additives into the hoax category, since some do indeed clean internal engine parts, and others may contain lubricants that don't harm the engine.




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