HPOP operation questions... (sorry) - PowerStrokeNation : Ford Powerstroke Diesel Forum
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post #1 of 26 (permalink) Old 12-15-2009, 05:05 PM Thread Starter
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HPOP operation questions... (sorry)

OK... So this is my question.
The way I understand, which may not be correct. Is that the HPOP is of fixed displacement. Meaning it always pumps a given amount for a given RPM. Is this correct?

So, taking the RPM's out of the equation, it's like a water hose...Right?

Lets say you have a water hose with the same amount of flow at all times...

There's a nozzle on the end, like the IPR(yellow), and two nozzles branching off, like the oil rails(red).




So... If you want the two yellow (red) hoses that are branching off to have LESS pressure, you open the yellow one on the end to get less pressure? And to get more you close the yellow valve?

First of all, is this correct? Or am I way off base? I will ask more questions if it is.

Edit: Blowby
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post #2 of 26 (permalink) Old 12-15-2009, 05:58 PM
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Re: HPOP operation questions... (sorry)

youre pretty much on the money.

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post #3 of 26 (permalink) Old 12-15-2009, 06:01 PM Thread Starter
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Re: HPOP operation questions... (sorry)

OK. So. Would calling for excessive ICP at WOT help to keep the ICP up since it would be holding the IPR closed? Or is there a lot more to it?
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post #4 of 26 (permalink) Old 12-15-2009, 06:10 PM
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Re: HPOP operation questions... (sorry)

There is a table that commands the ipr duty cycle. The more duty cycle the more closed the ipr stays. It is kind of a first guess at the icp pressure. Then there is a table for icp pressure that fine tunes is, but if your ipr table is way off its not gonna happen.

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post #5 of 26 (permalink) Old 12-15-2009, 06:16 PM Thread Starter
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Re: HPOP operation questions... (sorry)

OK. Cool. Thanks man. So... Do you want your ICP to stay close to 3000 at all times during WOT? Seems like the more pressure the better right? What is the debate about excessive ICP, and at what point does it become excessive?
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post #6 of 26 (permalink) Old 12-15-2009, 06:20 PM
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Re: HPOP operation questions... (sorry)

The big debate over extreme ICP (3200 psi and over) is that the injector poppets cant hold that kinda of pressure.

1999.5 F-250 7.3l 4x4 6 spd Ported Heads, Head studs, valve springs, DI Push Rods, DI RR, 38R, Walbro fuel pump, 238cc Injectors from Nate @ Unlimited Diesel and Tuned by Matt @ Gearhead Automotive


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post #7 of 26 (permalink) Old 12-15-2009, 06:24 PM Thread Starter
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Re: HPOP operation questions... (sorry)

Ahh... I thought it has something to do with oil foaming as it passed over the IPR. What do dual IPR's help?
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post #8 of 26 (permalink) Old 12-15-2009, 06:29 PM
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Re: HPOP operation questions... (sorry)

Dual IPR's are used for DC% controlling pressure better.

On Edit:

Here is a thread that will help you understand DC% and IPR's better.

IPR Duty Cycle: What to consider? - Powerstroke Nation

1999.5 F-250 7.3l 4x4 6 spd Ported Heads, Head studs, valve springs, DI Push Rods, DI RR, 38R, Walbro fuel pump, 238cc Injectors from Nate @ Unlimited Diesel and Tuned by Matt @ Gearhead Automotive


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post #9 of 26 (permalink) Old 12-15-2009, 06:34 PM Thread Starter
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Re: HPOP operation questions... (sorry)

Thanks!
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post #10 of 26 (permalink) Old 12-15-2009, 07:52 PM
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Re: HPOP operation questions... (sorry)

He pretty much hit the nail on the head about the excessive icp. Some claim they hold 3800psi, others claim to see them float at 2800psi. Ive personally never had a performance gain going over 3100-3150. On higher mileage trucks ive also developed a rough feel to the motor or almost a misfire at higher pressures under wot, which leads me to beleive some injectors are hot holding the pressure back and not firing evenly with the others.

The reason behind dual iprs is if you double the volume of oil and are only able to pass the same amount past the same ipr..you may get pressure higher than you want to, especially when letting off at high rpms from wot. Imagine the nozzle on the end of your garden hose stayed the same, but now you had the hose hooked up to a fire hydrant, as opposed to your normal outlet at your house. Imagine what the pressure in the hose would be, even if the nozzle on the end of it was open as much as possible.

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