 Intake runner connecting hose, any silicone versions? |
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| timothy_nd28 |
 Feb 21 2021, 11:11 PM
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#1
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Advanced Member  Group: Members Posts: 2,299 Joined: 25-September 07 From: IN Member No.: 8,154 Region Association: Upper MidWest 
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In the process of going thru my 1.8 and replacing rubber pieces inside the engine bay. I feel like that I just did this not that long ago, and the once new rubber connecting hoses on the intake to the plenum are already rock hard and cracking.
I think I have seen pictures of people using silicone couplers, but can't find a source. The intake runner measures way closer to 37mm vs 38mm. I feel the 1.5" couple will cause vacuum leaks. Silicone may seem like the way to go, just need a direction what people are using and where to obtain them.  |
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Replies(1 - 8)
| 914Sixer |
Feb 22 2021, 07:31 AM
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#2
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914 Guru Group: Members Posts: 8,882 Joined: 17-January 05 From: San Angelo Texas Member No.: 3,457 Region Association: Southwest Region
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You are correct, 1.8 do not like vacuum leaks.
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| jd74914 |
Feb 22 2021, 11:24 AM
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#3
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Its alive Group: Members Posts: 4,780 Joined: 16-February 04 From: CT Member No.: 1,659 Region Association: North East States |
I could never find a silicone tube that I liked the fit.
Not what you asked, but when I was DDing my 1.8L in college I replaced those boots with high temp, heavy wall heat shrink tubing from work (Spencer Turbine stuff, most typically used for plant vacuum tubing). Worked great and cleaner look! I'd grab a picture, but engine is disassembled. |
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| Rand |
Feb 22 2021, 02:01 PM
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#4
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Cross Member Group: Members Posts: 7,409 Joined: 8-February 05 From: OR Member No.: 3,573 Region Association: None |
Seems like a place like this would have something:
https://www.siliconehose.com This has to be awful close: https://www.siliconehose.com/1-380-id-4-ply...ej20-compliant/ |
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| live free & drive |
Feb 22 2021, 02:05 PM
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#5
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Member Group: Members Posts: 158 Joined: 29-June 16 From: New Hampshire Member No.: 20,159 Region Association: None
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| timothy_nd28 |
Feb 22 2021, 02:59 PM
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#6
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Advanced Member Group: Members Posts: 2,299 Joined: 25-September 07 From: IN Member No.: 8,154 Region Association: Upper MidWest
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All good options. I spent some time last night looking for a solution, and that 1.380" silicone hose seemed to be the closest. Thanks Rand, I was on that site the most last night. The intake runner is around 37-38mm, and I wasn't sure how stretchy the 1.38" (35mm) hose would be.
The food grade 37mm silicone hose seems like it will be perfect, not sure if I'm a fan of the transparency. I thought I saw a picture of someones engine bay that already had these and made a bad assumption that some place was selling these as a kit. |
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| 914werke |
Feb 22 2021, 03:15 PM
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#7
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"I got blisters on me fingers" Group: Members Posts: 10,070 Joined: 22-March 03 From: USofA Member No.: 453 Region Association: Pacific Northwest
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QUOTE(Rand @ Feb 22 2021, 12:01 PM)  This has to be awful close Not like horse shoes (IMG:style_emoticons/default/biggrin.gif) Those hose arent engineered to stretch deflect like rubber hose, needs to be pretty close to the correct ID & typically uses clamps At 4 ply they are pretty firm |
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| VaccaRabite |
Feb 22 2021, 06:58 PM
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#8
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En Garde! Group: Admin Posts: 13,444 Joined: 15-December 03 From: Dallastown, PA Member No.: 1,435 Region Association: MidAtlantic Region |
yeah, stretching silicone hoses is a loosing battle. They are usually nylon reinforced and that stuff does not stretch well.
Though the stock connectors don't use a clamp, you can put a clamp on silicone to make it squish down a little more. For turbo applications you always you a clamp to keep from blowing the boot off under boost. Zach |
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| 914werke |
Feb 22 2021, 07:20 PM
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#9
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"I got blisters on me fingers" Group: Members Posts: 10,070 Joined: 22-March 03 From: USofA Member No.: 453 Region Association: Pacific Northwest
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Th OD of s 2.0L tube is approx 1.54", the plenum side is a bit less so the 1.5" stuff would be a better bet
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