Importance of High Pressure Cross Over - Ford Powerstroke Diesel Forum
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Old 06-21-2013, 01:48 PM
KS_ KS_ is offline
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Importance of High Pressure Cross Over

I was wandering what the importance might be of a HPX. Riffraff diesel offers one for 60 odd dollars. I'm pretty much stock for now but I heard it can make the idle sound a lot better. Does it do much more?
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Old 06-21-2013, 04:07 PM
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Originally Posted by KS_ View Post
I was wandering what the importance might be of a HPX. Riffraff diesel offers one for 60 odd dollars. I'm pretty much stock for now but I heard it can make the idle sound a lot better. Does it do much more?
HPX MODE.

This hose is used to bridge the 2 high pressure oil rails in the heads that feed the injectors on the 7.3L Powerstroke.
The installation of this hose will typically smooth out rough idles as the ICP can now sense the pressure in both heads, quiet the engine, as well as provide improved oil flow to the injectors.

This kit is intended for installation on a power stroke engine to ensure that the high-pressure oil rails receive the same amount of high-pressure oil from the high-pressure oil pump. The result of installing this kit includes, but is not limited to, a quieter running engine, smoother idle, and more responsive throttle. This kit is recommended to all power stroke owners from model year 1994 through and including the 2002 model year.

This kit will NOT eliminate what is commonly called “cackle” or “idle knock”. One side effect of this kit after installation is that the engine runs quieter. This allows you to hear other potential problems in your engine that were previously covered up by engine noise.

The cylinder #8 tends to get less oil. The firing order is 1-2-7-3-4-5-6-8. Because 6 & 8 are both on the same side 6 uses the oil pressure and then 8 fires before the pressure has time to recover, with the crossover line some of the pressure bleeds over from the other head to assure that 8 has as much pressure as possible.

The problem with the #7 injector was on the superduty trucks with their dead head fuel systems. The #7 would get shortchanged on fuel and would "cackle"


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Old 06-21-2013, 04:16 PM
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dieselsite actually recommends removing it if it is installed when you install the adrenaline HPOP.
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Old 06-21-2013, 04:44 PM
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I have it on both of my trucks I didn't notice much of a change on my 94. It took maybe 30 % of the idle hop out and that's it just as loud as before


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Old 06-21-2013, 04:55 PM
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Originally Posted by c69ss396 View Post
dieselsite actually recommends removing it if it is installed when you install the adrenaline HPOP.
That is correct.
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Old 06-23-2013, 05:34 AM
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I've also heard instead of buying new lines you can remove the spring check valves and it does the same thing
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Old 06-24-2013, 08:11 AM
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Originally Posted by PSDTV21 View Post
I've also heard instead of buying new lines you can remove the spring check valves and it does the same thing
I also have read that but IIRC the OBS dont have that spring check valves, maybe somebody corrects me.

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Old 06-24-2013, 09:48 AM
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yes the obs's have the check valves in the HPOP
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Old 06-24-2013, 09:53 AM
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Quote:
Originally Posted by c69ss396 View Post
yes the obs's have the check valves in the HPOP
Ah, OK, thanks.
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Old 06-24-2013, 12:25 PM
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Quote:
Originally Posted by c69ss396 View Post
dieselsite actually recommends removing it if it is installed when you install the adrenaline HPOP.
That's dumb.......
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