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Vacuum Hose Sizes, Total Lengths, and Sources?

Help, Advice and DIY Tutorials on Volvo's extremely popular car line -- Volvo's 1990s "bread and butter" cars -- powered by the ubiquitous and durable Volvo inline 5-cylinder engine.
1992 - 1997 850, 850 R, 850 T5-R, 850 T5, 850 GLT
1997 - 2000 S70, S70 AWD
1997 - 2000 V70, V70 AWD
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1997 - 2004 C70

Vacuum Hose Sizes, Total Lengths, and Sources?

Postby C@lvin » 29 Sep 2010, 13:34

Jablackburn previously posted that he needed 3.5mm, 4mm, 6mm, and 8mm hoses to replaced all the vacuum hoses in his 850 (turbo).

Does anyone know if these are the same for the 98 - 00 V/S/70 (non-turbo)?

What quantities of each size are needed in order to replace all the vacuum hoses?

None of the auto parts stores in town have metric hoses. Advance Auto Parts has:

5/64" (1.9844mm)
5/32" (3.9688mm)
7/64" (2.7781mm)
7/32" (5.5563mm)
9/64" (3.5719mm)
9/32" (7.1438mm)

The 5/32" could probably substitute for 4mm but I hesitate to use, for instance, 9/64" for 3.5mm since it is slightly larger and may fit loosely. Interestingly, I notice that IPD lists 9/32" for 7mm (larger at 7.1438mm actual) and 1/8" for 3.5mm (smaller at 3.175mm actual).

What vacuum hose sizes (and quantities) do you usually use and where do you get them?
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Re: Vacuum Hose Sizes, Total Lengths, and Sources?

Postby thecheat » 29 Sep 2010, 15:13

+1 here, I would like this info as well. My hoses all need to be replaced and I would like to know what diameter to get and how much to do all of them.
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Re: Vacuum Hose Sizes, Total Lengths, and Sources?

Postby rrochell8 » 29 Sep 2010, 16:24

stylinmotors.com They have kits to fit most all Volvos.
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Re: Vacuum Hose Sizes, Total Lengths, and Sources?

Postby C@lvin » 29 Sep 2010, 17:01

Thanks for the sylinmotors tip. I had heard of them before.

I'd still like to know the necessary lengths of each size so that I can price the rubber hoses and compare it to the stylinmotors $59 for the silicone versions. That seems pretty expensive to me. If you needed 20 feet (and I am pretty sure you wouldn't need that much) that is $3 per foot, not including shipping :o .
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Re: Vacuum Hose Sizes, Total Lengths, and Sources?

Postby t5ftw » 30 Sep 2010, 02:19

I am curious about this kit too. So, their hoses are actually metric-sized? How is the quality if anyone used it before.
I heard the kit include some kind of zip tie for clamping. Is this good enough for the purpose? Any other cheaper but good quality alternative?
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Re: Vacuum Hose Sizes, Total Lengths, and Sources?

Postby thecheat » 30 Sep 2010, 02:25

I would like to go all silicone but I've heard of some hoses collapsing under vacuum. I may just buy a roll of each of the rubber hose in those sizes and skip the silicone and the uncertainty with that.

Any evidence on the problem with silicone hose?
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Re: Vacuum Hose Sizes, Total Lengths, and Sources?

Postby jblackburn » 30 Sep 2010, 02:34

I don't see the point in going for the silicone hose. The rubber lines on my car have already stood up to 12 years of use; I seriously doubt I won't have run this car into the ground in another 12 years. They're great cars and all...but 25 years old? Probably no.

The rubber hoses are much cheaper (Calvin, yes, the "American" sizes work just fine - I put small little ring clamps on some of the looser ones - especially the intake manifold and turbo control valve hoses), and like I said, will probably stand up just fine.

The '98 has a SAS system; there's a long purple line from the valve up by the radiator to the SAS valve at the back of the car. That was one I had some trouble finding the right size for - as the elbows are a much bigger size than the line itself - I think it's like the line on the PCV system if you've done/remember that one. You probably don't need to replace that one, but the elbows were starting to go on mine and I was trying to chase down a pesky O2 code.

I don't know the NA engines well enough to give you an answer on how much you'll need - I do know that the differences between a 98 and 99 configurations between a T5 have quite a variety of different vacuum lines, however.

This might be a question you could defer to the folks at Volvospeed.
'98 S70 T5 218K miles
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Re: Vacuum Hose Sizes, Total Lengths, and Sources?

Postby Matty Moo » 30 Sep 2010, 04:02

My local ACE has a large selection of automotive vacuum hose. Most of what is on my Platinum is from there.

I'm with him. If you can get 10+ years out of the stock rubber hoses why pay $35+ more for silicone, especially on a NA that doesn't have nearly the lines the turbo has.
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Re: Vacuum Hose Sizes, Total Lengths, and Sources?

Postby C@lvin » 30 Sep 2010, 12:44

Even if you go silicone, you still need the rubber elbows which are already the high failure point, right? So that seems to kind of defeat the purpose. I am inclined to stick with the rubber hoses......of course, they don't come in all those cool colors that make the engine run better :mrgreen:
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Re: Vacuum Hose Sizes, Total Lengths, and Sources?

Postby t5ftw » 30 Sep 2010, 18:07

Those colors too flashy for my taste. Besides, it doesn't go well with my dirty engine bay. I would rather go with black silicone. So, is the decoration the only benefit of silicone or is there something else?
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Re: Vacuum Hose Sizes, Total Lengths, and Sources?

Postby jblackburn » 30 Sep 2010, 19:10

The "real" benefit of silicone is that they'll last forever! So, when your car is dead and gone years from now and there's a zombie apocalypse and Will Smith is the only living man left on the face of the Earth, your vacuum lines will still be in good shape. :mrgreen:

The IC hoses I can see buying silicone ones for, but they would just stand up to high boost levels better and resist collapsing.

As I recall, there were only 4-5 vacuum elbows on my car. 2 at the ends of the PCV vacuum hose, one at the evap canister, and 2 on the SAS valve hose. Most of them, though, can be done with just straight shots of hose. Buy a package or two of small screw clamps.
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Re: Vacuum Hose Sizes, Total Lengths, and Sources?

Postby C@lvin » 30 Sep 2010, 20:01

OK....so I am trying to avoid:
1. Doing the replacment in the Advance Auto parking lot so i can go in and out, matching hoses and elbows as I come to them.
2. Doing it at home but driving back and forth to the Advance Auto figuring out which hose and elbow sizes I need.
3. Doing it over several weeks one hose at a time.

I called two AutoZones and they won't even tell me what sizes of hose they carry. They say, "just bring it in and we'll match it. And I've called all over town and nobody has hoses with metric IDs. I went to Ace hardware as suggested above, but my Ace only had two sizes and neither was close to the required sizes. Advance Auto has a good selection of SAE ID hoses and they are all around $.79 to $.89.

So it would be great if there was a list of the hose lengths, hose sizes, and elbow sizes needed to replace all the vacuum hoses at once (even the $60 stylinmotors kit comes sans elbows).

It doesn't sound like such a resource is available :( , so as I attempt to do this job I will try to compile the information and post it back in case it might help others :) .
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Re: Vacuum Hose Sizes, Total Lengths, and Sources?

Postby thecheat » 30 Sep 2010, 20:41

Mcmaster Carr to the reeeesssscuuuuuueee!!!!!! Here is their tubing page:

http://www.mcmaster.com/#tubing/=92qge1

You can buy rubber or silicone (or neoprene, or latex, nitrile, etc) hose... by the foot... with precise metric diameters.

I looked up 2mm ID (6mm OD) silicone tube and it is a buck a foot, 4mm ID is a little more per foot, etc..

So if someone could say you need "X feet of Y ID tube" then we could just buy it by the foot from a company that doesn't screw around with questionable materials and do it all right the first time.
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Re: Vacuum Hose Sizes, Total Lengths, and Sources?

Postby C@lvin » 30 Sep 2010, 20:47

thanks for the contribution!
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