Cotton Over Pipes.... Why?

[dobboy 231 2 Cars]

Excuse my ignorance but can someone tell me why the pipes associated with vacuum have a cotton overbraid?

 

TIA

[nick205 12 5 Cars]

The reason (as I understand it) for brake flexi hoses to be over braided is to reduce hose expansion under pressure.

 

That doesn't tally for vacuum pipes though does it!

 

Possibly to protect from chafing, but then a plastic conduit would be better in that respect.

[Slo 283 1 Cars]

More like heat protection as its a timing critical component so you really don't want the rubber pipes perishing. Odd thing is most people stuck a bare pipe on that outlasted the advance mechanism

[calvinhorse 870]

Stops them from sucking shut.

 

Also being part of the brake system

Needs to be reinforced for safety

 

 

Well I say needs to be, that's just something I've been told, my car has injection hose for the brake vacuum and has always passed mot

Edited March 7, 2014 by calvinhorse

[dobboy 231 2 Cars]

Can't see the cotton braided pipes I have stopping them from shutting.

 

One thing, at work our guys wrap stuff in cotton tape, basically like a bandage, prior to pouring a hot liquid, >200deg, over it.

 

At times we've broken down this liquid again with heat which had turned solid as it cooled, and the cotton tape is still in very good condition.

 

So I'm guessing its more to do with heat, on safety system pipe work.

 

Strange nobody really knows though!

[calvinhorse 870]

Another question you've asked and then decided your own answer..

[calvinhorse 870]

First reply - to stop expansion

 

Second reply - to stop heat

 

Third reply - to stop sucking shut, the over braid is cast into the rubber hose not seperate, it is visible from the outside but isn't just a cover.

 

And you've read all this and still can't find an answer?

[dobboy 231 2 Cars]

First reply - to stop expansion

 

Second reply - to stop heat

 

Third reply - to stop sucking shut, the over braid is cast into the rubber hose not seperate, it is visible from the outside but isn't just a cover.

 

And you've read all this and still can't find an answer?

Is it multiple choice?

[calvinhorse 870]

No, all of the answers above answers cover your question

[dobboy 231 2 Cars]

First reply - to stop expansion

 

Second reply - to stop heat

 

Third reply - to stop sucking shut, the over braid is cast into the rubber hose not seperate, it is visible from the outside but isn't just a cover.

 

And you've read all this and still can't find an answer?

 

No, all of the answers above answers cover your question

Calvin, well done, you chose 3 answers and never got any of them correct!

 

The reason that It is provided is to minimise damage caused by friction.

[Tom Fenton 1,542]

Well please strike down everyone who has tried to be helpful and answer your question. Hopefully all those people will join me in ignoring everything else you post on this forum.

[Daviewonder 533 3 Cars]

The reason that It is provided is to minimise damage caused by friction.

 

I don't reckon this it the reason. Why would they only do it to vacuum pipes? I wonder if it's to do with keeping contaminants away which may soften the pipe resulting in collapse.

[dobboy 231 2 Cars]

Tom, there is a distinct difference between being helpful and guessing.

 

I would rather have no reply than a confidently put wrong reply, and I would guess I'm not the only one.

[Daviewonder 533 3 Cars]

I'm still not convinced your answer is correct. That puts you in the above category.

[allanallen 528 2 Cars]

If it's to do with chaffing why aren't the fuel pipes etc over braided? I realise injection pipes have an inner braid before anyone mentions it.

 

It isn't necessarily to do with vacuum either as as far a I'm aware it's only the brake servo vacuum hose that has an overbraid. Fuel pressure reg vac hose etc is just plain hose.

 

Are you looking to replace your pipe or just curious to the reasoning?

[m@ttc 30]

the idea is to clamp the cotton in a jubilie/hose clamp, it acts as mechanical strength, if the pipe is pulled the rubber part stays fine because the cotton is taking the srain.

[dobboy 231 2 Cars]

If it's to do with chaffing why aren't the fuel pipes etc over braided? I realise injection pipes have an inner braid before anyone mentions it.

 

It isn't necessarily to do with vacuum either as as far a I'm aware it's only the brake servo vacuum hose that has an overbraid. Fuel pressure reg vac hose etc is just plain hose.

 

Are you looking to replace your pipe or just curious to the reasoning?

Allen, both.

 

I've done my fuel pipes with the R9 stuff, and going to replace vacuum stuff with nicer looking pipe, but curious as to why overbraid is/was used on the vacuum stuff originally.

[allanallen 528 2 Cars]

No idea why peugeot did it originally, a lot of aftermarket vac hose doesn't have it and obviously silicone vac hose doesn't either. If you're concerned just replace it with like for like, your local motor factors will probably have it.

[Ryan 99]

Most likely it's because that particular hose was a penny per metre cheaper when buying it by the kilometre.

Edited March 8, 2014 by Ryan

[calvinhorse 870]

The reason (as I understand it) for brake flexi hoses to be over braided is to reduce hose expansion under pressure.

 

That doesn't tally for vacuum pipes though does it!

 

Possibly to protect from chafing, but then a plastic conduit would be better in that respect.

Dobboy - Chafing had been covered Edited March 8, 2014 by calvinhorse

[calvinhorse 870]

Seriously is this Surgie?

[harryskid 193]

I just can not see why no one can not "Cotton" on to the answer to this!

[dobboy 231 2 Cars]

Seriously is this Surgie?

1. Yes

2. No

3. Maybe

 

 

No idea what/who you're on about Calvin.

[harryskid 193]

After a bit of researching i think i have the answer. The cotton over is to help the rubber pipe keep its shape!

As for using cotton, the original idea was to use nylon but with fashion changes in ladies not wanting to wear the big old cotton knickers and wearing little skimpy ones

there was a large stock of cheap cotton going spare! So there you have it!

[pyrrhic 14 2 Cars]

Ryan seems to have the right answer. I am sure the braided hose was simplest the cheapest Peugeot found to do the job.