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Ever since their introduction, direct injection engines have suffered from notable issues such as carbon buildup in the combustion chambers, increased cylinder wall scuffing, and particulates in the exhaust similar to diesel engine's (most of the smoke produced by diesel engines is actually small particles). On diesels, particulate traps solved the issue by filtering out the particles, and then periodically super heating the filters to burn them off, which is also why diesels have heat shields on their exhaust tips, both to prevent burns on passerby's, and limit their ability to set other things on fire.
Yet another example of improving technology creating a whole new set of problems.......
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“Anything really new is invented only in one’s youth. Later, one becomes more experienced, more famous – and more stupid.” - Albert Einstein
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