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Old 04-15-2009, 12:38 PM
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High pressure oil question

Hi all,

I am newbie when it comes to the systems assosiated with a diesel engine. So I have a question, what does the High pressure oil system do? I ask because I have been reading a lot on people installing crossover lines to help balance the system. I thought it had to do with the fuel system but was corrected in an email I received saying it has to do with the oil system. Here is what I am wanting to get, KCM S.S. HPX Line (99-03) . Just need some clarification. Thanks

Brian
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Old 04-15-2009, 12:42 PM
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WELCOME TO THE ORG I HAVENT INSTALLED ONE BUT ITS FOR THE HIGH PRESS. OIL RAIL THAT FEEDS THE FUEL INJECTORS. SOMEONE MORE EXPERIENCED WILL CHIME IN
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Old 04-15-2009, 12:43 PM
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The injectors are operated with high pressure oil. The oil is used to compress a piston inside the injector, which compresses the fuel to increase the injection pressure of the fuel.
The HPX ties the two high pressure oil rails in the heads together. The thought here is that since injector #8 fires directly after #6 and they are side by side in the head, that #8 may not always have adequate oil. The HPX ties the 2 HPO rails together to help keep #8 happy and working efficiently. No real power gains to be had, but a smoother and quieter idle is what most notice.

Last edited by superduty4x4; 04-15-2009 at 12:51 PM.
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Old 04-15-2009, 12:46 PM
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http://www.nwforddiesels.com/tech/pd...escription.pdf
That is at least somewhere to start on learning more about HEUI injection. There are a few good articles out there on it, I'll see if I can find more.
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Old 04-15-2009, 12:53 PM
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PowerStroke
How does a Powerstroke Injector Work?
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Old 04-15-2009, 01:15 PM
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I've been debating this mod for a while and was wondering about long term effects. I've noticed that the #8 injector is typically the first to go, does this help prevent that? Or is the only thing this accomplishes is to smooth out the idle. Just curious about the mod itself.
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Old 04-15-2009, 02:29 PM
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Quote:
Originally Posted by rooney77 View Post
I've been debating this mod for a while and was wondering about long term effects. I've noticed that the #8 injector is typically the first to go, does this help prevent that? Or is the only thing this accomplishes is to smooth out the idle. Just curious about the mod itself.
The HPX will probably help keep #8 in a little more oil, but I don't know that anyone has actually tested the injector life of cyl 8 with and/or without the HPX.
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Old 04-16-2009, 10:21 AM
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All this talk about #8... Usually its the fuel that #8 needs because of the deadhead system and the 2 fire next to each other.

I installed the HPXover. I noticed nothing at all. but its a good thing to have. I will put one on my next truck (hopefully a forged rod dually in silver!)
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Old 04-16-2009, 10:31 AM
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once i got mine on i noticed that it smoothed the idle. no idle speed variations. had a guy comment that it sounded quieter than his 6.0 ()
it's also easier to start cold. it was pretty cold here one time. about 25* with a north wind. my truck is a baby without the block heater and without it, it usually will pulse/lope/idle very rough. whatever you wanna call it. this eliminated that. since the oil was cold, i was able to supply the #8 with enough oil just by shear volume from the other HPO rail.
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