Hilton

I'm looking at getting the correct Cohline hose to rebuild fuel lines with (and the correct collars).

Unfortunately, I can't find the old original fuel hoses I thought I'd kept for measuring, so I don't have the total length required to make all 4 engine bay hoses on the later cars.

Does anyone happen to have some NOS or original ones handy they can measure the length of in centimeters? (on the short side of the bend)

The four hoses are:

1. Loop from the pump-fed hard line to the front dampener
2. Straight-ish bit between the front fuel rails (18cm - measured on car)
3. Short U-shaped bit between the FPR and rear Dampener
4. Loop from the throttle pulley bracket to the fuel cooler

I'm guessing from my memory of the shape of the hoses that the numbers are something like: 22,20,11,29cm. However I'd like to get some actual measurements off the real things

Leon Speed

Which car, 89 or 87? Plus, the correct length depends on the maximum bend radius of the hose, so the original lengths might not work for other hoses.

pevi

Maybe more vital information would be intenal diameter ( and external ) ( in mm. ) used in original hoses.

Man can always purhase some extra length if size is known.

I would like to get information for YM. 90

ROG100

We used to supply 4' to cover all those hoses. Some are different ID.

The old Cohline hose is not good with the new fuels at all.

As the collars do not do anything you would be far better with EFI hose clamps.

Hilton

I was originally thinking 88-95, although thats a good question, as the length of the line to the fuel cooler on an 87 is different, and thus would also be useful. (I'm ignoring the S-shaped hose to the fuel pressure regulator - its not a polyamide hose like the others, and is relatively cheap and not under pressure)

I'm intending to get multiple cars worth - one of the guys in NZ has posted on another mailing list about ordering a roll and asking for people to share costs with as it comes in bulk - 20m per roll (66ft). I'm just trying to work out what length per car.

The Bend Radius for the Cohline 3024.800 hose is 50mm (2 inches), which I think might work for the U-shaped one too, although it'll be close (I haven't pulled the intake off a car to check, yet ).


The chemical compatibilty chart looks to be ok with the various fuel options available. I'll add it as an attachment below. Fine with ethanol, methanol, toluene, xylene, benzol, cyclohexane and petroleum - which pretty much covers all the additives used in Australia to manage octane rating and stupid ethanol regulations.

The stock ones are 8mm ID.

I'm curious which - the ones at the rear of the car (e.g. return to tank, and ones to the expansion tank) are all larger, but the polyamide ones at the front which are mostly under pressure (excepting the bit to the fuel cooler), all the barbs are the same size from memory.

Anyone have hoses they can measure? (Rob Edwards? )

ROG100

Hilton,
You should be fine with 8mm as it is the correct metric size. Remember the EFI SAE sizes were imperial - 5/16" & 3/8" - some were tighter than the others hence the use of two sizes.
I was looking at 2240 specs for Bio Fuel - as you say 3024 looks fine.
I have all the original hoses here - what measurement do you need? I guess total hose length under the cover.
I checked again on our fuel hose kits - we supplied 3' to cover all the hoses apart from the U hose and the front fuel hose under the oil filler cap on 87.5 to 95 cars. 87 to 87.5 we included the correct Porsche hose from the pressure regulator with the kit. On the 85 to 86 32v and 84 to 86 twin dizzy ROW cars - 4' of fuel hose (included the U hose as it was a larger bend radius and could use bulk hose) plus the front fuel hose from Porsche.
I have an account with Newco if that helps.
Roger

PS: The bend rad looks OK at 50mm for the U hose - that is very tight - seeing is believing 8>)

Hilton

Thanks Roger for the reply - I'll pass on to the bloke in NZ the Newco idea. I'm not sure where he's planning on getting the hose from, but doing it through a 928 vendor makes sense in a few ways.

You're correct, I'm after the total under-hood length for an S4 - so I can make sure I get enough of the bulk hose to do a few cars local to me (including my two), and enough of the correct collars.

There are a couple of late cars locally who have original hoses - so measuring individual hoses when they're apart (and keeping originals as templates) won't be an issue once the hose is here.

Lastly, yes, the 50mm bend radius does sound optimistic - I can only assume the hose is a lot more pliable when it hasn't had 25 years of hardening!

oaros

Interesting - I am trying the same - got as far as finding out that min order with Cohline UK for 3024 is 50 meters. Are you also looking to get the clamping gadget that holds the hose for inserting the ends?

Kiwi928S4

Hi Roger and Hilton
I have been dealing with Neil at Newcoproducts - so would more than happy to route all this through you Roger - looking at a 20.0m roll and 80 ferrules to suit. So far we four of us that want the Cohline hose and correct ferrules - I dont really want to get into the parts business but am keen to get my Cohline hose.

ROG100

Ken, I think it is Ken - how do the ferrules work? Never seemed to do anything on the original and new hoses from Porsche. Are they swaged or ?
Roger

Kiwi928S4

Hi Roger

Yes it is Ken - the ferrules seem to be a push on fit - more for dressing then any form of clamping pressure looking at a new front Cohline hose on my car - MY1991S4 They probably prevent the hose expanding enough to be pulled off under pressure. I am not sure how hard it is to put new hose on - probably use a heat gun or hot water - get it soft and a good push with some KY jelly. I am dealing with Neil at Newco - do you want to take this over - I have 5 people (NZ and Oz) who want the hose plus a few in the UK who are interested? Send me a PM

Warmest

Ken

PC-85-928S

Has anyone ever made a braided fuel hose kit?
I know El Greco did a few and they look great.

ROG100

Yes and we sell them - made by Greg Brown and Lifetime guaranteed.

GregBBRD

The rear return line on 1987 to 1989 vehicles was rubber with crimps...not plastic, like the other three hoses are.

Porsche "allowed" that one hose to be rubber. They were concerned that the plastic would not "flex" enough to allow for the engine movement. After these hoses started leaking, at the crimps, they quickly changed this hose to plastic in 1990. Note that this only took them 3 years....that's how fast you can expect any rubber hose to shrink enough to begin leaking.....even when crimped.

Be careful you don't try to put the plastic hose over these fittings!

Note that the "factory lines" have a rubber covering over the plastic. The "crimps" (which are not really crimps at all, but simply collars to protect the rubber part of the hose and make it "look" better) cover this thin rubber protective cover.

Be careful not to put rubber hose over the ends designed for use with plastic. The barbs are sharp and can cut the rubber liner.

People would do a lot better to buy the two hoses that are still available (*see note below) (very economical), until the factory runs out of them and do something else for the other two hoses. I, for one, make replacement hoses for these other two hoses. Roger, at 928sRus inventories and markets these lifetime warranty hoses. Not nearly as economical as the factory hoses, but they are designed to never leak. Polyester covered, Teflon lined, forged custom metric ends (one of these ends, alone, costs me as much as the complete factory hose), crimped ends.

If I could have thousands of the forged ends made (like Porsche did) we could get the costs down....

Note: If you have an early '87, your car will be equipped with a pressure regulator with a hose attachment fitting coming out of it. The hose will be rubber and will travel a very short distance to a "adaptor" on a bracket. It will attach to this bracket with a clamp. Off of the other end of this bracket is another hose (plastic) which goes to the fuel cooler. The fuel cooler will have female threads.

This is a bit of a "disaster"...too many hoses...to many connections...rubber hose with clamps, in one position.

I always replace the regulator with the "late" regulator (928 110 198 04) and then I custom make a special one piece hose that replaces everything with one single hose. Ask Roger for my custom '87 to late regulator hose.

If you have a "late" '87, you will have the same return hose as on your '89. (928 100 269 01). This is one of the hoses that is still available, new, from Porsche. The other hose that is available is the front hose from the fuel rail to the front damper (928 110 359 08.) Both of these hoses are high quality hoses and are exceptional values, from Porsche.

ROG100

When people like Greg share their hard earned expertise - we are SO LUCKY to be part of a great community!!!