Carl Fausett

If you are unable to locate the fuel line with the plastic inner hose that you desire, we can make it from SS Barided fuel line for you.

I import the metric ball flare to -6AN fittings (have been for long time) as I make up hoses for the 928 supercharger kits with them.

Here are some examples of other high pressure fuel lines I make for the 928 in stainless braid: (below)

So - if you want your "U-shaped" high pressure line in stainless braid with metal fittings, just ask, I can make that up.

BC

Carl Fausett - the man, the mystery, the legend that refuses to step out of the way of approaching technological advancements, and holds on with steadfast resoluteness... to CIS.

Carl Fausett

I make L-Jet and LH-Jet fuel lines too. ;-)

Thanks, (I think)

ROG100

Carl,
Again the issue is the minimium bend rad.
Do the design parameters of your hose meet or exceed the criteria of SAE 30R9 and the min bend rad of 26mm with a 7.5 to 8.00mm ID.
I can find plenty of hose like you are offering, but apart from one non meet the min bend rad.
If they do then that is a great solution.
Let me know please?
Best,
Roger

Carl Fausett

I buy my SS braided hose in bulk from Goodridge.
I will not be in the morning, but I can contact Goodridge (or you can) and ask the question minimum bend radius on the SS braided -6 hose.

Have been offering Hi pressure and Low pressure fuel lines for 928's for 2 years now, but they are expensive. The anodized alluminum fittings (especially those with the correct metric ball flare) do not come cheap, and the labor to assemble them drives the price up.

The point of this post was to say we have a metric crimping tool now and can offer a more economical solution.

I think the whole diversion into bend radius is overblown and takes away from the original intent of this thread. The bend you are discussing is not that tight. Note that the Porsche engineers used non-plastic lined hose on the 85-86, and I am using the better, upgraded spec hose currently manufactured.

As we have now seen, when they went to the plastic lined hose on 87 and up (DR's picture) they also reduced the bend at the same time.

I'm not suggesting that minimum bend radius of a fuel hose does not matter - it does and you are right to consider it IF you are going to change the original design. But I am matching the OEM hose and hose length, so I am not concerned.

Brandon, please review our website for more than 200 non-CIS products.

ROG100

Carl,
So you are willing to warranty your hose to meet the conditions of the U hose on 87 and newer cars.
I have the hose and the bend rad is 26mm - are you saying it is not?
So your customers can rely on your design recommendation I would welcome a statement that they meet or exceed the original design parameters and that is all I am asking. The hose you are usining is rubber or plastic or PTFE with a simple overbraid. The hose is manufactured to a standard - what is that standard and the design parameters. If it meets the criteria I will be purchasing from you.

This is a very real concern for the 928 community and your lack of detail of the parameters of your hose and/or an overall statement that they should meet the criteria does not cut it with me - that is said with the greatest respect and not in any way derogatory.
I care about our cars and only want the right solution for this application.
What is so difficult in stating or confirming the parameters.
Thanks,
Roger

the flyin' scotsman

To be crystal clear the hose in question is the '87 + line from the regulator to the damper;

DonT

part # 92811027102

ROG100

Goodridge is an excellent hose manufacturer and there -6 range with SS braid has a min bend rad of 60mm for the lower pressure and 70mm for the higher pressures.
They have an aramid braided hose which will achieve the 25mm MBR but it is not available in the size we need.
Roger

the flyin' scotsman

Roger............did you ever dissect a OEM 'U' hose MY 87+ and if so what were your findings?

Surely (not Shirley) we can replicate with good as or better?

H2

On 968Forums a company is making and selling stainless braided hoses of which one broke at the fitting (looked like it was torqued too tight or perhaps a manufacturing flaw). I tried to upload the foto but it was too large. The hose was fabricated by one of the 968 suppliers and failure was attibuted to the way in which it was installed. They did mention that the stainless hose wasn't made for tight bends. Braided stainless does look nice. It requires password access so I didn't post the URL.

Harvey

dr bob

In my limited experience...

Stainless or other outer metal braid is there for abrasion protection, and does nothing to prevent collapsing when the hose is bent too tight. The outer braid can even hide some hose collapsing issues. Some hose has steel braid under a rubber/whatever cover as the outer layers, and actually seems to do a better job under most circumstances.

I guess I need to crawl in there under the air filter box and look at the space allowed for the installation. If I was looking just at the two fuel rails as the limits from a design perspective, I'd be looking hard at a steel replacement with a couple 'expansion' loops. Or maybe a U-shaped steel section with two short straight connecting hoses. Of course the FPR and the damper are probably spec'd with zero nozzle loading, therefore requiring a hose connection.

Thoughts?

ROG100

Hi Bob,
Two issues in my mind : -
1) Replacement of the NLA hose with an equivalent or better hose to fit in the same location as the original unit. Porsche engineers always did something for a reason and I believe that to be the case here. What is stopping us is a suitable hose that meets the design criteria ie SAE 30R9 with a MBR of 26mm. That is not achievable with a SS braid.
2) Thinking outside the box and away from the original concept. Is it really necessary to emulate the hose? Would a hose with an slight S form as per the front fuel hose serve the same purpose?

My first goal was to come up with the solution to number 1).
Failing that I plan to run the hose in another direction towards the fuel cooler and this will allow a longer hose with a MBR in line with SAE 30R9. So standard EFI Hose with EFI clamps.

heinrich

Yellow is steel, red is rubber.

dr bob

H-

That's kinda what I was thinking, maybe better. If the hose can take the radial displacement as the heads move, your option eliminates two hose-over-tube connections that are the likely failure points.

Roger-

I think you are on the right path, especially for a consumer version. Hans and Fritz didn't do much without a lot of thought, so trying to rethink what they already thunked up is no easy task. Keep up the good work!