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How does an injector work?????

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Dennis

01-27-2003 07:44:36




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How does an injector direct fuel into the cylinder and yet return fuel to the tank?




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Gary McKenzie

01-27-2003 08:40:49




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 Re: How does an injector work????? in reply to Dennis, 01-27-2003 07:44:36  
Exactly how it works depends on the type of injector, some are simple nozzles, where injection pressure and timing are controlled by the injection pump, others use the injector to develop injection pressure. In all of them, fuel is present all of the time at low pressure. Fuel is allowed to pass through the injector, usually through a fixed orifice, and returned to the fuel tank. The injector fires when it recieves a high pressure pulse from the injection pump, the orifice provides enough restriction to cause a pressure rise in the nozzle, unseating the valve and allowing fuel to be sprayed into the combustion chamber. The ability for fuel to pass through helps remove entrapped air and cools the injector. If anyone can explain better or clarify feel free to do so!

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david

01-27-2003 12:46:28




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 Re: Re: How does an injector work????? in reply to Gary McKenzie, 01-27-2003 08:40:49  
Good explanation.

On pump controlled injection (in line) the tappets travel the full stroke for each cyliner, each time. At less than full throttle fuel in the excess of the amount sent to the injector plumbing is diverted to the tank. On distributor type pumps the process is similar, only there are only 2 tappets and the orface rotates. The tappets still must travel a full stroke each time. On the newer types (like on Ford pickups) line pressure is constant and the injectors are opened by an external high pressure oil pump, Mercedes and CAT use electronics to accomplish the same thing.

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