Originally Posted by KS_
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?
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"