12mm vacuum hose

[Dave]

Hi,

Just a quick question.  Does anyone know what PSI or Bar rating the three 12mm vacuum hoses need to be ?

[volkenstein]

Dave,
        Not off the top of my head, but you don't want a PRESSURE rated hose, you have to look at
internal rigidity as the one thing that causes problems is non-vaccum rated hoses collapsing.

That is why we recommend Belmetric , or BMW or Mercedes REINFORCED BRAKE BOOSTER hose.

Lee and myself and no doubt a few others have used airlines (rigid) or hydraulic hose with a rated
stiff sidewall for vacuum as well as burst pressure. the downside is they are more often than not 1/2 inch as opposed to the above 12 mm.  Parker-Hannifin has a bewildering range of imperial sized hose...
but as so many others market good qual hydraulic hose.....you'll have to let your own fingers do the walking.....down to your knuckles


HTH
Volkenstein

[Dave]

I see, thanks for that.  I'll get looking and let you know what I find.

[autonewbie]

When desperate, any hose will work IF you install a spring inside its full length. The spring prevents it from collapsing. An old trick but it works very well.

[Dave]

Thanks! 

[68autobug]

When desperate, any hose will work IF you install a spring inside its full length. The spring prevents it from collapsing. An old trick but it works very well.

Yes, I;ve seen all sorts of hose in photos of autostick engines, including garden hose... lol

LEE

[Dave]

Does the smaller diameter shift signal hose going to the control valve have to be vacuum rated too?

[volkenstein]

Dave,
         Braided (cloth) VW hose of 3.5mm ID is all you need, or any other small ID hose. The max vacuum it ever sees is 5 In Hg. In other words...whatever works.


HTH
Volkenstein

[Dave]

Brilliant, thanks very much.

[sb001]

Made in Germany:

http://www.germansupply.com/home/customer/product.php?productid=17046&cat=&page=3


Made in U.S. (same style hose, a little cheaper):

http://www.germansupply.com/home/customer/product.php?productid=17946&cat=&page=3

[Dave]

Thanks sb, that looks like good stuff.

[vwman55]

Right here:

https://www.belmetric.com/metric-hoses-wire-reinforced-hose-c-14_140.html?zenid=k24bbboojqov4ng36ol1o73kd0

RH12W - Wire Reinforced Comes per meter need about 4' to do all hoses

[Dave]

Thanks, just waiting for payday now!

[sb001]

I'm going to have to pick up one of these too- just discovered I have a big rip in the vacuum line going from my tank under the left rear fender up to the control valve. 

[sb001]

Will a tear in the vacuum hose going from the vacuum tank under the left rear fender to the autostick control valve affect the car's running in any way? Or is this vacuum path isolated to the autostick system only?

(Posted this over on the samba but no responses.)