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Old 12-20-2008, 06:51 PM   #1
96imprezaL
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Impreza GC8 JB weld?

ok so i am going to be making a hybrid intake but the intake tube is too long to hook up to the stock intake box and MAF sensor and if i cut it to size it would cut off a nub for one of the vacuum hoses to hook up to....well i was thinking cut it off as well as the nub and drill a hole in the intake tube and then jb weld the nub back on the tube...sound good?? anyone have any experience with jb weld?? i have no way of really welding the nub back on so i figured jb weld but iv never used it so what do you guys think??
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Old 12-20-2008, 07:47 PM   #2
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you should be fine. it's low pressure. can you not cut off the other end? or does it bend somehow?
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Old 12-20-2008, 07:53 PM   #3
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yea i cant cut the other end b/c of the bend....i know i can get it to fit but its just that nub stopping me and i just thought of jb weld so yea ....but yea i was thinking the same thing...low pressure, doesnt get insanely hot,
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Old 12-20-2008, 08:01 PM   #4
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the pressure and temp wont be the biggest problems with JB weld. If the intake is aluminum, it wont stick to it well. You should do your best to scuff up the area that the JB weld will be adhering to on both the nub and the pipe.

If its plastic, it may stick very well or not at all, depending on the type of plastic.

can you use a t-fitting on any remaining "nubs" and avoid having to re-attach the removed nub all together?
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Old 12-20-2008, 08:15 PM   #5
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i already have a t being used b/c there werent enough nubs for the vacuum lines...and the intake is aluminum...i could scuff it and put the jb weld on but yea unless there is some kind of thing that has 4 outlets that i could hook 4 hoses up too then im gonna have to drill and jb weld :/...
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Old 12-20-2008, 08:44 PM   #6
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you might consider having someone weld it on in case the JB doesn't hold. i dont think it will be a good long term solution. good luck, though.
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Old 12-20-2008, 08:51 PM   #7
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damn...i just dont want the shop to screw me on a price...but thanks guys ill look into it
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Old 12-20-2008, 09:10 PM   #8
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if you clean and prep the hole and "nub", they shouldnt charge you more than $20 really. It costs them about $1 in gas and welding rod and 5 mins of time. some places may have a min one hour labor rate or something similar, though.

if you were close, id do it for free. Try to find a fellow car enthusiast.
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Old 12-20-2008, 09:33 PM   #9
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yea..that still sucks though for a little nub :/....yea thanks....ill see if anyone around here has a welder or a way of getting ahold of one...thanks
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Old 12-20-2008, 11:06 PM   #10
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check out this link for some info on why/how bonding aluminum is difficult.

Last post on here has some brands of bonding agents to check out - http://www.eng-tips.com/viewthread.c...=180049&page=1

Is your intake anodized? if so, you may get some good results with bonding adhesives. But, again, i still think welding would be cheaper, faster to do (no cure time, and no shipping on adhesives that you may have to order), and more reliable long term. if you give JB weld a try, check it very often. running with a post MAF intake leak is no good.
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Old 12-20-2008, 11:20 PM   #11
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I had to add some new nubs to my hybrid intake so I used some threaded brass hose fittings from home depot, they have a 3/8 threaded end and the other end is made to connect a rubber hose to, I just used a 3/8 drill bit and drilled into the aluminum and force threaded the fitting into the hole the harder brass has no problem threading into the aluminum. I think it would be a lot stronger than jb wield.

Last edited by Ioku; 12-20-2008 at 11:26 PM.
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Old 12-21-2008, 12:04 AM   #12
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^^^wait wait wait...you got a threaded brass hose fitting with a 3/8 threaded end and drilled into the intake with a 3/8 drill bit and the threaded brass hose went into an unthreaded hole and stayed?? pics would be a HUGE help with that ...post some pics of that please so i could see that...and maybe a pic of the actual brass hose fitting so i can go get that thanks
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Old 12-21-2008, 10:41 AM   #13
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make sure you get a NPT (pipe) threaded end so it will become air tight when its screwed in. This type of threads is slightly tapered, so as you screw it in, it get tighter and tighter. A straight/AN type thread will not seal at all. Its a good idea to use some sealing compound on the threads, also. Loctite 513 would be ideal. Teflon tape would work in a pinch. depending on how thick the aluminum tube wall is, cracking is something that could happen after a while of the heavy brass fitting vibrating in the aluminum hole.

Here is a pic of the type of fitting you want. if you go to buy one, bring a piece of the hose you will be attaching to it and make sure the barb end (the end without the threads) will fit the hose tightly. A hose clamp would be good insurance.

Fitting

3/8 NPT sounds like a good compromise between hole diameter (strength) and fitting weight. a big heavy fitting hanging on just few mm of aluminum will crack eventually. a really small fitting will not have much contact area with the aluminum and may strip out easily when installing.
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Old 12-21-2008, 11:31 AM   #14
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you know, I didn't think of this before. you don't need JB weld. you can use their ^ idea of using a threaded piece, and solder it. easy, cheap, and very effective. The solder will wick into the threads, keeping it airtight. But scuff it up a bit to give the solder a place to bite. Although, if it's past the air filter and a piece were to ever break off....hmmm, you may have to go with jb weld. or the teflon tape way.
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Old 12-21-2008, 12:10 PM   #15
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Can you solder brass to aluminum without melting the aluminum? Would one have to braze it instead? i have done some brazing on steel, and it would be much too hot to do to aluminum.
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Old 12-21-2008, 12:32 PM   #16
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cut a section of the intake off in a spot where there is no nubs and use a silicone coupler.
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Old 12-21-2008, 12:47 PM   #17
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I've also used threaded barb fittings on intakes. I sealed mine with silicone and never had any issues. You can solder the joint if you want to....or use alumiweld rods and a torch. It won't be pretty enough for a show car, but it will function fine when you get it sealed.

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Old 12-21-2008, 01:10 PM   #18
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Like Jay said, try this for joining aluminum parts
http://www.durafix.com/
I picked up some from our local Harbor Freight. Works great for stuff like intake tubes and bungs that don't have a lot of pressure or stresses to start with..
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Old 12-21-2008, 03:42 PM   #19
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Quote:
Originally Posted by jordan s View Post
cut a section of the intake off in a spot where there is no nubs and use a silicone coupler.
haha this is EXACTLY what i just thought up like yesterday ...i took some measurements today and not need to borrow something to cut it with since i have nothing :/....i have a small dremel i tried using today but its tiny and not very powerfull :/.....so looks like ill go borrow the neighbors hack saw ...thanks guys
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Old 12-23-2008, 01:51 AM   #20
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Quote:
Originally Posted by RaceFaceXC View Post
make sure you get a NPT (pipe) threaded end so it will become air tight when its screwed in. This type of threads is slightly tapered, so as you screw it in, it get tighter and tighter. A straight/AN type thread will not seal at all. Its a good idea to use some sealing compound on the threads, also. Loctite 513 would be ideal. Teflon tape would work in a pinch. depending on how thick the aluminum tube wall is, cracking is something that could happen after a while of the heavy brass fitting vibrating in the aluminum hole.

Here is a pic of the type of fitting you want. if you go to buy one, bring a piece of the hose you will be attaching to it and make sure the barb end (the end without the threads) will fit the hose tightly. A hose clamp would be good insurance.

Fitting

3/8 NPT sounds like a good compromise between hole diameter (strength) and fitting weight. a big heavy fitting hanging on just few mm of aluminum will crack eventually. a really small fitting will not have much contact area with the aluminum and may strip out easily when installing.
THe fittiong I used looks just like that one in your link I never used any sealant or anything and its been working fine for the past 3k miles no cracking or any problems.
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Old 12-23-2008, 01:29 PM   #21
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We have little rubber nipples that we put over our extra nubs, they work great and can be found at any auto store!

Mike
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Old 01-03-2009, 12:46 AM   #22
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Heres some pics of the fittings and drill I used



and heres a pic of it on my intake the fitting is the brass thing between the pipe and the hose.

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Old 01-03-2009, 03:58 AM   #23
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I like the leopard-print intake.
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Old 01-05-2009, 12:12 PM   #24
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Yeah thats the JDM mud print intake
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