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  1. #26
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    Click here to enlarge Originally Posted by uniter Click here to enlarge
    Hey Rob!
    Great DIY. I had heard there are some problems with JB bonding with plastics, is this a special formulation or did I receive some bad information? It probably doesn't matter in this application because you're using the JB Weld to provide a seal, I might recommend some type of liquid gasket or liquid rubber cement (I'm sure there's something for this application) because these are two different materials which will expand and contract differently with temperature differences.
    I think it depends mostly on surface roughness. Plastics can be very smooth, but if you rough them up first, it works well. Same with metal. Take some sand paper to it before using epoxy.

    The other problem is that plastics can flex, but the JB weld remains rigid and that causes the epoxy to separate from the plastic substrate. This will not be a problem with the intake manifold. It is designed to be very rigid, and the type of plastic used is inherently rigid (ABS?). However, if you JB-welded a flat piece of something to a flat piece of plastic (PP or HDPE are both reasonably flexible and both can be very smooth) that doesn't have much support, the bond could fail.

    I JB welded a brass nipple into a plastic (glass filled?) BMW air/oil separator once, and the bond held up great until the car I installed it on got rear ended, which is impressive considering it was in direct contact with synthetic engine oil. Used correctly JB weld works amazingly well, but it can't work miracles.

    I also used JB weld to epoxy a fitting into the bottom of a ten gallon HDPE garbage can that I used as a water tank. This bond failed because the bottom of the can flexed too much despite the fact that I roughed up the plastic beforehand.

  2. #27
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    1 out of 1 members liked this post. Yes Reputation No
    Awesome thread! Just did this today as the nipple broke while trying to undo the vacuum hose.

    Saved me from missing a trackday tomorrow!!

  3. #28
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    What I still don't understand, is why anyone would still try to pull the vacuum hose off that nipple knowing how often it breaks... Just cut the f*cking hose off and use an exacto knife to cut the remaining hose off the nipple. You've lost like 1 inch of hosing, big deal. If it bothers you, but a new piece of hose. Never break a nipple again. I can't remember now how many times I've given this advice, nobody listens. Works perfectly.
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  4. #29
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    Click here to enlarge Originally Posted by klipseracer Click here to enlarge
    What I still don't understand, is why anyone would still try to pull the vacuum hose off that nipple knowing how often it breaks... Just cut the f*cking hose off and use an exacto knife to cut the remaining hose off the nipple. You've lost like 1 inch of hosing, big deal. If it bothers you, but a new piece of hose. Never break a nipple again. I can't remember now how many times I've given this advice, nobody listens. Works perfectly.
    I do this exact thing, I just prefer metal lol!
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  5. #30
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    Click here to enlarge Originally Posted by Wideawake Click here to enlarge
    Awesome thread! Just did this today as the nipple broke while trying to undo the vacuum hose.

    Saved me from missing a trackday tomorrow!!
    Welcome.

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  6. #31
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    Click here to enlarge Originally Posted by klipseracer Click here to enlarge
    What I still don't understand, is why anyone would still try to pull the vacuum hose off that nipple knowing how often it breaks... Just cut the f*cking hose off and use an exacto knife to cut the remaining hose off the nipple. You've lost like 1 inch of hosing, big deal. If it bothers you, but a new piece of hose. Never break a nipple again. I can't remember now how many times I've given this advice, nobody listens. Works perfectly.
    Exactly, not even an inch. Just half an inch and bam it's out in 3 seconds not even.
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  7. #32
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    2 out of 2 members liked this post. Yes Reputation No
    The problem is, we only search for this kind of thread after the nipple broke. Good effort by the OP

  8. #33
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    Can you still drive with no hose going from intake manifold to bov? Mine broke today but parts stores are closed.

  9. #34
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    Click here to enlarge Originally Posted by J. Dub Click here to enlarge
    Can you still drive with no hose going from intake manifold to bov? Mine broke today but parts stores are closed.
    This happened to a guy that bought a bov from me. He was able to super glue the nipple back on for a temporary fix. I dont think u should drive without that.

  10. #35
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    Response on my Tial was 100x better after doing this mod and running a true 1/4" line to it.

    Thanks for the DIY

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