FredR

I think we can take it that it is there for a reason. I do not know the ins and outs of power steering design but I am reasonably well versed in hydraulic design. The power steering pump is a positive displacement machine which basically means it will displace a fixed volume for every revolution and draw whatever power is needed to make that happen until something "breaks". This is why there will be a pressure relief device of some kind in the pump discharge volute.

As the pump is direct driven the faster the pump spins the more assist effort it will generate. The irony is that we probably need more assist when we are in the parking lot turning 2k rpm as we maneouver. Thus it would seem reasonable to kill some of the hydraulic effort by fitting a restriction orifice to give more steering "feel" at higher rpm's when there is more flow in the system.

That thing in the middle of the run is, I suspect, a connector of some kind with a calculated bore of some reduced ID. The outer sleeve being a crimp for each end of the adjoining hose that is probably sat on barbed ends. If it is something different then hopefully someone will chime in.

Whether or not deleting this device can create a negative condition of some kind [more pressure on the seals for instance] might be an interesting point for discussion purposes.

Thus why Porsche and other marques go for an electrically driven power steering pump so that it can be better tuned to the specific need and not drain power parasitically when not needed as in driving in a straight line which is most of the time. I have no idea how much power the PS pump draws but presumably it is more than insignificant if it is generating a decent amount of pressure. Easy to calculate if the flowrate is known but I have no clue as to how much that wil be apart from a scientific guess based on the size of the line the flow runs through. I dare say the system has a by-pass for when the steering is pointing straight ahead to negate power draw but...?

Rgds

Fred

Don Carter

I had my HP hose rebuilt locally a year ago or so on my 86.5 and have not been happy with the results. The shop does nothing but hydraulic hoses and seemed to know what they were doing. They brazed the old fittings onto some new threaded fittings, then used a stainless braided hose that they said was the same internal size and could handle the pressure. I now have moaning and reduced steering pressure. I'm not sure if there was a restrictor or not.

soontobered84

Don,
Are you unhappy enough to replace the HP line again? I've had lines rebuilt locally that were rebuilt like yours and didn't have any issue.

What fluid are you using in your PS system? I use Dexron VI which is, as you know, fully synthetic.

Doesn't the moaning and groaning come when the pump is being starved of fluid? I wonder if the line they used was not actually the same I.D.? You might try changing the fluid to alleviate the sounds.

Don Carter

John,

Yes, it's a pain to remove the hose, but it's bad enough that I need to fix the issue, but not sure when I'll get around to it. The shop told me to replace the reservoir since the filter might be clogged, but it's hard to see how this could have happened as a result of hose replacement. I'm using Dex III compatible, but it may have been Dex V, not sure. Maybe a different fluid would be worth trying.

Tony

kicking myself now for not asking for the old hose to cut it up?

Randy V

And the speculation continues!

soontobered84

The reservoir filter does get clogged. The Stepson was groaning, I replaced the reservoir, did nothing else, and the groaning stopped.

YMMV.

Koenig-Specials 928

Ditto

RET

FWIW, the high pressure line on my GT started to seep recently and did a thorough job of spreading ATF on the engine and exhaust manifold. I decided to replace it rather than rebuild the old one and Roger has a new one on its way to me.

Replacing the line looks to be the usual disassemble half of the car project, and the routing of the high pressure and return lines does not really make sense to me. I suspect that the same engineer or committee that designed the fuel line that used to weave across the front of the engine (replaced with a Greg Brown line) and the hydraulic line for the clutch must have been responsible.

Randy V

What were you doing to the poor boy?

Tony

on this note..i think everyone needs to look at the HP hose at it passes down just behind the driverside camshaft gear....front left corner of the driverside cam cover. Make sure it isnt rubbing there or has an abrupt bend relative to the path that the rest of the hose takes. I made a 2 inch long aluminum protection sleeve(1" tube cut length wise in halve ) that covers the hose at this point to prevent any chaffing or kinks.

The location was exactly where my old one was seeping /leaking.
I would also make sure the rubber protection hose is on the HP line also...if it does rupture the rubber protective hose will help keep the fluid from "spraying and atomizing" onto the headers and going POOOOOFFFFFF

dzaprev

Where is everyone getting the hoses done? I can't find a place by me . If anyone knows a place in Illinois please let me know.

Tony

the place i have all mine done http://www.marisausa.com/

Im lucky to have them near by.

Randy V

Search for Hose Man - I think it's a chain. But be aware the quality of work by them varies widely.

Randy V

Search for Hose Man - I think it's a chain. But be aware the quality of work by them varies widely.

Or just search for hydraulic hose repair service.