What is High Pressure Oil Pressure?

BigRedWeather

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Can someone explain what HPOP does for my truck?
-Which aspects of performance does it effect?
-What are signs that the pressure or volume are too high or too low?

I have seen several posts about HPOP but can find none here, or on Google that explain it.


Thanks,


BigRedWeather
 

95_stroker

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Our injectors are driven by two sources, one is electrical and that signal comes from the IDM (injector driver module) and that signal opens a solenoid on top of the injector and the other source is oil that comes from the HPOP. It is what drives the fuel into the combustion chamber. Our injectors are commonly called HEUI (hydraulic over electric unit injectors). So, you need high pressure oil to drive our injectors, the higher the pressure the better atomization of the fuel you get and the more of the fuel will be burned completely.
 

Patrick Feeley

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Our injectors are Hydraulically-actuated, Electronically-controlled Unit Injectors (hence the HEUI designation). They need high pressure oil to inject the fuel at pressures 7X that of the HPOP system pressure. The HPOP boosts the regular lube oil up there to do that. The truck's computer tells the injectors when to allow the HP oil to do its thing by activating each injector's solenoid via the Injector Driver Module's 120V (or so) signal to them. The PCM will also control the HP oil system by various signals from engine sensors and such. I've gor a electronic copy of an International pamphlet on the HEUI injection that's pretty good (1.2M in Powerpoint or 3.1M in pdf). If you want me to send a copy, PM me with your email address and I'll send it out. Cheers!
 

BigRedWeather

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Patrick and 95_Stroker,

THANKS! Your posts were very helpful! Now I have an idea what I am dealing with.


BigRedWeather
 

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