heinrich

Und hier wir haben Heinz; Fritz UND Heinrich

heinrich

Clearly I'm an artist with a mouse

DonT

Clearly ! ! !

Bill Ball

H'man: I think with that limited amount of hose there would not be enough flexibility when assembling the fuel system. You are joining two hardmounted components (FPR, dampner) which are each hardmounted to the fuel rails. I suppose you could loosen the components, install the line inquestion, then retighten their mounts, but you would have to loosen the fuel rails as well. Maybe that's trivial. The design of the 87+ line is so different from the proposed solutions, and I wish I understood why they went to a crimp-free, clamp-free, semi-rigid, pressed-fit line.

Bill Ball

Here's my autopsy. This is a hose that was installed with the Supermodel SC. Andy's manifold design relocated the fuel rails in about an inch. This caused the hose to develop a kink, as you can see. I replaced it with a new, same part that has tolerated the compression of the radius without kinking. Note the way the hose is pressed over the ends, about 3/4ths of an inch and seats against a collar. No clamps or crimps, but that must be some job the get the tube over the barbs.

ROG100

Bill,
So is that the original hose with the sleeve removed?
It looks like a thermoplastic hose which would explain how they got it over the barbed fitting.
Sort of like heat shrink.
The restriction and kinking do not look good.
Roger

ROG100

Bill,
Can you tell me any numbers and letters on the hose.
I think I read Aerflex as the manufacturer.
Roger

Bill Ball

Roger:

Yes, I cut off the rubber cover to expose the fuel line.

The name is Aalflex (I see Dave has the link). The numbers, left to right, are a sequence (7 to 11) with another character (>) between the lower numbers just as shown, ending in 84 and two dots, then some space before it reads Aaflex 11>. The dashes represent a continuous background line printed in the same white ink.:
07>---08>---09>----10----11----84 . .--------Aaflex--11>

Bill Ball

Oh, and as to the kink, here is a photo of the line held approximately as the Supermodel SC configuration compresses the loop. I don't know if DR has redesigned the manifold so the fuel rails are not moved inward, but for other Supermodel SC owners, this could be a problem. The fuel flow is a ring around the fuel rails, so even if this line kinked there still is communication across the front of the rails. The kink is not 100% occluded and the line looks like it not about to split; however, I immediately replaced it with new. This is some tough fuel line material. The earlier fuel line design would appear to be more compatible with having the fittings closer together.

ROG100

OK,
Here is where I am on a possible solution.
Using a readily avaiable pre-formed hose at the right bend rad and placed over the barbed fittings of the existing hose and secured with EFI clamps.
The material is specifcally for EFI applications and meets or exceeds SAE 30R9.
Cost about $16 plus the clamps.

I want to pressure test the assembly before I feel comfident that we have a cost effective viable solution.

DR

Roger (and others),

I am not the forum police, but I just now realized that this thread was started by Carl as his product announcement for the 85-86 hose replacements. Out of respect for him I suggest a new thread be started to discuss the 87-up hose.

ROG100

Hi Dave,
I would normally agree with you but we have been disussing this particular hose since post number 2 and as we are now at page 8 it seems a little late.
I offered to share my findings with Carl as it was his original Thread as well, however I have had no communication from him at all.
I will start a new Post if you and others think it would be pertinent, however it would just be a copy of this 8 page thread.
Thanks,
Roger

heinrich

LOL DR why didn't we think of that ... revolutionary, a PRE-MADE HOSE!!!

SeanR

I was over at Rog's place this afternoon and this looks like a perfect fit. But won't know until further tests are done.

Well done guys, it takes many minds to design one of these cars, and it takes a few more minds to figure out what the original designers did and then to figure out a way to replicate it.

Keep up the good work everyone.

Carl Fausett

ROG - I am lucky if I can get to a PC at all these days to answer this. I have no time whatsoever to call Continental and get the specs for min bend rad for the hose that Porsche suggested is the direct replacement for the original line. Their recommendation was goood enough for me. I offered it as a solution for 85-86 like Dave said.

When I get my wife home from the hospital, when I get caught up on my knee-deep voicemail box and I answer all those people waiting email responses, and ship my products and my staff comes back from their vacation - I might just have time to call Continental and get that spec for you that you will not listen to anyway as you are developing your own solution any how. The point is moot.

You say you have had no communication from me on this, yet I have tried to answer every one of your questions here publicly in the forum. You just do not like my answers.

And no, I will not guarantee the fuel line - whatya think, I'm nutz? If my insurance carrier knew I was making fuel lines for customers they would probably cancel my policy. I must be nuts for even offering to make them up for people. Nobody loves and enjoys the 928 more than I do - but fuel lines are FUEL LINES and the final responsibility for them rests with the mechanic that installs them and tests them for leaks immediatly upon installation.

If you make your fuel lines commercially available, it will be interesting to see if YOU offer a guarantee on them.