heinrich

It's really clear to me that in time (not a lot of it even) a straight hose bent to 180 degrees, will collapse. The only nitigator IMHO would be a noncorroding insert that holds the hose shape and I.D. from the inside. It is my plan to go with a steel hose there.

ceedee

ditto

Giovanni

I used Carl's high pressure hose on the u-shaped hose and it works perfectly. I'll see if I can take a picture of it later today. It seems the bend radius soothes out a little bid with the heat and fuel pressure going through it , can anyone confirm it this is true?

Carl Fausett

That's the best explanation I have heard for why 1) it is not a metal line from the factory, and 2) why there is a loop in it.

ROG100

Jim,
I think you are saying that the hose was made in that way to absorb movement.
So my thought process is good and a rigid pipe would not be the way to go.

H,
Maybe you are refereing to an all metal flexible hose. A SS convoluted core with a SS braid pressure thrust restraint. Now on that subject I know a lot more as I sold them for years in the Aerospace industry. My first concern would be the min bend rad and IIRC a 5/16"/9mm would not cut it.
The end fitting is a combination of welding and swaging and may restrict the length of available flexible hose.
I will look and see what is available these days.

On your point about the collapse of the rubber/PTFE type hose. The hose is made up of several different layers of material for this very purpose and is designed to stay in the designed condition at a defined temperature, working-proof and burst pressure at a min bend rad.
No concerns there as long as you are within those defined parameters.
The hoses I take of cars are brittle with age and not deformed.

ROG100

Carl,
I agree.
Roger

Tony

doesnt that hose have a hard plastic shell around it?
Most often its that outer shell that apears cracked and dammaged..not the hose internally. The stock hoses are VERYtough, they were actually VERY hard to remove from the stock fittings when i did all mine...but hey, they are VERY old none the less. Replacing them with what ever means is a good idea!

Leslie 928 S2

Carl,

This is great! Hey, by any chance are you offering this same service for the high pressure oil lines too? Or could you in the future? I know Kevin would be very interested. We need to do that for the five speed.

Hope you are well!

Leslie

byrdman454

I had the "pinching" problem when I went to get this fuel line replaced. When we tried to re-create the same bend radius (with the same length EFI hose), it pinched. We did look into some spiral bindings that go around the hose to keep its shape. They look like slinkys. I gave up and went with braid. They kept their shape and are protected from damage. I ended up replacing all my rubber fuel in braid.

Carl Fausett

Damn.... why didn't I think of that? Let me work that through... I need to get the right ID hose in bulk, and then the right OD swadged ends, and then the right mandrel for my swaging machine. I think I might have it already...

Good idea!

ROG100

Mike - AKA Byrdman454,
Which car is that hose from? The end fittings have a lot of rigid pipe and therefor restrict the bend rad of the hose.
thanks,
Roger

Dave H.

see post #6

ROG100

Dave,
Different to the 87S4 I just modified.
Maybe a later S4?
Roger

byrdman454

Roger, this is from my '88 S4.

Mike Frye

Carl,

Thanks for adding yet another option to those of us who want to drive our cars forever. Your company is a pleasure to deal with and when I get in there for the rest of my intake refurb I'll definitely be sending these out to you.