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Indirect injection in an internal combustion engine is fuel injection where fuel is not directly injected into the combustion chamber. Gasoline engines equipped with indirect injection systems, wherein a fuel injector delivers the fuel at some point before the intake valve , have mostly fallen out of favor to direct injection .
Typically, hydraulic direct injection systems spray fuel into the air inside the cylinder or combustion chamber. Direct injection can be achieved with a conventional helix-controlled injection pump, unit injectors, or a sophisticated common-rail injection system. The last is the most common system in modern automotive engines.
The 2005 Toyota 2GR-FSE V6 engine was the first to combine both direct and indirect injection. The system (called "D-4S") uses two fuel injectors per cylinder: a traditional manifold fuel injector (low pressure) and a direct fuel injector (high-pressure) and is used in most Toyota engines. [65]
Retrieved from "https://en.wikipedia.org/w/index.php?title=Direct_Injection_vs_Indirect_injection&oldid=15993587"
The length of fuel lines from the pump to each injector is normally the same for each cylinder in order to obtain the same pressure delay. Direct injected diesel engines usually use orifice-type fuel injectors. [182] Electronic control of the fuel injection transformed the direct injection engine by allowing much greater control over the ...
Direct injection— where a fuel injector sprays the diesel fuel directly into the main combustion chambers. This causes a more complete combustion process than using a pre-combustion chamber (known as indirect injection), which therefore increases the torque output and reduces the exhaust emissions. [1] [2]
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