HEUI and Common rail
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HEUI and Common rail
Somebody please explain to me what common rail injection is? and how does it differ from our trucks? I believe the 6.0, duramax and cumapart all use the same system. Thanks for feeding my thoughts
Tim
Tim
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From: Lincoln, NE
http://www.swedespeed.com/news/publi...inter_272.html
http://en.wikipedia.org/wiki/Common_rail
some reading for your Sunday afternoon...
http://en.wikipedia.org/wiki/Common_rail
some reading for your Sunday afternoon...
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From: STEPHENVILLE,TX!!!!!
common rail uses one high pressure fuel pump. usually injection pressures on the late model trucks run between 12,000psi and 20,000psi. and the injection timing is electronically controlled.
our rigs use 50psi fuel and 3000psi oil and achieve 20,000 psi by using the 3000psi oil and hydraulic intensifier to pressureize the fuel to 20kpsi for injection.
they are somewhat similar using some of the same tech. the heui has been around longer than common rail and i think it was one of the tech that really advanced common rail.
our rigs use 50psi fuel and 3000psi oil and achieve 20,000 psi by using the 3000psi oil and hydraulic intensifier to pressureize the fuel to 20kpsi for injection.
they are somewhat similar using some of the same tech. the heui has been around longer than common rail and i think it was one of the tech that really advanced common rail.
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Joined: Aug 2004
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From: Lewiston, Idaho
I am no expert but I will give it a shot.
6.0 is HEUI sysem like the 7.3. The cummins and duramax are both common rail though. Our truck uses a high pressure oil system where oil leaving the high pressure oil pump is sent through the heads into oil galleries. At the time of an injection event the ecm opens up a solenoid valve and pressurized oil enters into the injector causing the plunger to operate and inject the fuel into the combustion chamber.
Common rail systems on the other hand use a low pressure fuel pump to take fuel from the tank, send it through a filter and then send it to a high pressure fuel pump. The high pressure pump then pumps the fuel into a "common rail" or a shared pipe by all the injectors. The fuel in the rail stays full and pressurized all the time allowing the injectors to have a constant pressure fed to them at all times. When an injection event needs to take place the ecm tells the injector to open and close, sending fuel into the combustion chamber.
Thats my best shot, anyone feel free to add or correct if wrong.
6.0 is HEUI sysem like the 7.3. The cummins and duramax are both common rail though. Our truck uses a high pressure oil system where oil leaving the high pressure oil pump is sent through the heads into oil galleries. At the time of an injection event the ecm opens up a solenoid valve and pressurized oil enters into the injector causing the plunger to operate and inject the fuel into the combustion chamber.
Common rail systems on the other hand use a low pressure fuel pump to take fuel from the tank, send it through a filter and then send it to a high pressure fuel pump. The high pressure pump then pumps the fuel into a "common rail" or a shared pipe by all the injectors. The fuel in the rail stays full and pressurized all the time allowing the injectors to have a constant pressure fed to them at all times. When an injection event needs to take place the ecm tells the injector to open and close, sending fuel into the combustion chamber.
Thats my best shot, anyone feel free to add or correct if wrong.
Post Fiend
Joined: Jul 2005
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From: 21791
yep, that sounds right to me. a common rail system is basically a liftpump on steroids, it pressurizes fuel up to 25,000 psi, and that is the pressure maintained in the head. then the injector nozzles only have to atomize the fuel, not pressurize anything. the nozzles are opened and closed electronically.
HEUI systems have a rail pressure fuel) near 50-60psi (stock anyway), and another oil gallery of high pressure oil, at idle it's around 480psi and can get up to 2800-3100psi at WOT full load. there is an electromagnet in the top of the injector that is fed high voltage to the tune of 115 volts, and it is powered by the Injector Driver Module. the electromagnet opens and closes the port to let high pressure oil in to the injector body. fuel that constantly flows into the injector for cooling is then capped off and pressurized. that is what makes powerstroke injectors so damn expensive.
HEUI systems have a rail pressure fuel) near 50-60psi (stock anyway), and another oil gallery of high pressure oil, at idle it's around 480psi and can get up to 2800-3100psi at WOT full load. there is an electromagnet in the top of the injector that is fed high voltage to the tune of 115 volts, and it is powered by the Injector Driver Module. the electromagnet opens and closes the port to let high pressure oil in to the injector body. fuel that constantly flows into the injector for cooling is then capped off and pressurized. that is what makes powerstroke injectors so damn expensive.
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