direct-injection engine 
Direct injection refers to fuel injected straight into the combustion chamber above the piston. The technique has long been used on diesel engines in place of indirect injection into a prechamber. The newest systems use high pressure and timed delivery to dramatically reduce soot and smoky exhaust.

Direct injection also can be used in gasoline engines instead of regular fuel injection. This results in cleaner emissions, increased full-throttle power, and potentially better fuel economy.

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