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Re: advanced engine technics
diesels dont have valve timing controls because they do not have throttles, and are running at full throttle all the time.
they vary the power output by increasing or decreasing directly the ammount of fuel that enters the engine.
diesels also have direct injection, so that is another reason they are more efficient/ better.
i dont really get your questions though,
not all engines can have all the things you talk about.
besides, it is very expensive to produce those devices, so if every engine had them, there would hardly be any cars that you could buy for less than 40K
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