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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N54 Turbo Engine / Drivetrain / Exhaust Modifications - 335i > how to secure silicone intake hose



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      05-07-2012, 07:38 PM   #1
335okc
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how to secure silicone intake hose

OK, my silicone intake hose (vishnu pwm version) just popped out while i was doing 18psi.
it's been a year since i installed it and it's been through some abuse, not sure why it decided to pop out now.
since i'm going to have to remount it, what do you guys do to prevent this sort of things? i hate to over tighten the T-clamps for fear that it'll crush the throttle body.
do these things slowly edge out till it pops out? do you guys check it every so often? i usually inspect my engine bay and it didn't look out of norm yesterday.

any tips/tricks are welcome.
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      05-07-2012, 07:46 PM   #2
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Just tighten it. Get a 2nd T bolt clamp is another option.
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      05-07-2012, 08:47 PM   #3
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An old school trick is to completely clean the metal and coupling. Then spray hairspray on it and quickly put it back together. It will hold and can still be removed at later time.
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      05-07-2012, 10:39 PM   #4
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hm, hair spray, what an idea. if it pop out again, i'll try it.
i just tested it to 18psi, it's holding (so far). but i hope i never have to use my emergency road side kit on the side of a highway.
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      05-07-2012, 10:43 PM   #5
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Probably just due to oil exposure to the silicon coupler over time.
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      05-07-2012, 10:48 PM   #6
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The hairspray trick is hit and miss. I've never really seen it work, but I can't speak to the manner of how well it was prepped. On my buddie's camaro the only thing that ever really worked, as far as keeping the piping secured to the FMIC, were high quality t-bolt clamps.
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      05-08-2012, 09:39 AM   #7
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Mine popped off yesterday too, fortunately it still drives like that, you just can't hit any boost.

I think mine slipped off due to oil as well.

My idea if it happens again, is take a dremel tool to the bottom of the clamp and make it abrasive, so when it clamps down, it's less likely to slip. Makes sense right? Hope it works
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      05-08-2012, 09:52 AM   #8
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i think the main problem is the silicone on metal surface (the throttle body), not the silicone to clamp.
the throttle body has some grooves for the OEM intake, i wonder if we can use that to our advantage.
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      05-08-2012, 09:56 AM   #9
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Clamp over the grooves so that the silicone under the clamp will bite into them a little. The hairspray trick also works wonders.

What about a turn of friction tape or silicone hose repair tape on the throttle body? The adhesive will keep it in place and the coupler will have a much harder time slipping off.
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      05-08-2012, 10:28 AM   #10
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Quote:
Originally Posted by 335okc View Post
OK, my silicone intake hose (vishnu pwm version) just popped out while i was doing 18psi.
it's been a year since i installed it and it's been through some abuse, not sure why it decided to pop out now.
since i'm going to have to remount it, what do you guys do to prevent this sort of things? i hate to over tighten the T-clamps for fear that it'll crush the throttle body.
do these things slowly edge out till it pops out? do you guys check it every so often? i usually inspect my engine bay and it didn't look out of norm yesterday.

any tips/tricks are welcome.
Silicon hoses are not compatible at all with oil vapor at all. Upon exposure to oil, the silicon will swell and increase in volume up to 10-40% and they lose 40% of its strength. Over time, the hose inside diameter increases so it unable to seal against the tube bead. The hose should be replaced with either a flurosilicone material or a fluorocarbon lined silicon hose which will last 5-10 years. If you cannot find fluro type hoses then use either armide or fiberglass reinforced silicon hoses. It should be clear that with higher boost these hoses will become a maintenance item that needs to be replaced often (1-2 years). Alos, the clamp does not seal the hose against the tube

Last edited by Orb; 05-08-2012 at 10:40 AM.
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      05-08-2012, 11:34 AM   #11
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if i'm not mistaken, the hose is reinforced (i don't know by what material), but you can see the reinforcement on the cross section.
do you have any link to vendor selling these specialized silicone hoses?
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      05-08-2012, 11:52 AM   #12
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Quote:
Originally Posted by 335okc View Post
if i'm not mistaken, the hose is reinforced (i don't know by what material), but you can see the reinforcement on the cross section.
do you have any link to vendor selling these specialized silicone hoses?
Polyester reinforced hose are the worst and they will expand in just 1-2 weeks with plain silicon as the oil will be absorbed by the fibers. The polyester is fine on fluro hoses.

Samco makes fluro hoses but they are not cheap (about $100 each). I did find one vendor who makes a 2.5" coupler at $15 each and they do have other sizes. This is a fluro lined hose.

http://www.pacificp.com/store/index....roducts_id=329
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      05-08-2012, 12:08 PM   #13
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Quote:
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Also, the clamp does not seal the hose against the tube
Doesnt it though? The tube bead and hose inner diameters create the seal but it'll still blow off without a clamp, which is the same thing as not sealing as far as Im concerned.
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      05-08-2012, 12:33 PM   #14
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Quote:
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Doesnt it though? The tube bead and hose inner diameters create the seal but it'll still blow off without a clamp, which is the same thing as not sealing as far as Im concerned.
The hose wants to blow from the pressure which is the least path of resistance. The clamp purpose is to counter those forces. It is not possible for a clamp to make a full seal under any circumstances. If the hose has expanded due to oil contamination it will require a much higher clamping force that may leak at higher boost levels regardless and may not throw a code. I had this problem and now solved. There is not much to debate as this is a very well know issue that is mostly ignored by the aftermarket. One will need to do their own research to validate my comments instead of making assumtions.

Last edited by Orb; 05-08-2012 at 03:57 PM.
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      05-08-2012, 12:41 PM   #15
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Quote:
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The hose wants to blow from the pressure which is the least path of resistance. The clamp purpose is to counter those forces. It is not possible for a clamp to make a full seal under any circumstances. If the hose has expanded due to oil contamination it will require a much higher clamping force and may leak at higher boost levels regardless and may not throw a code. I had this problem and now solved. There is not much to debate as this is a very well know issue and mostly ignored by the aftermarket. One will need to do their own research to validate my comments instead of making assumtions.
Considering pressure physics and the ability of the hoses to swell this actually makes perfect sense, thanks for taking the time to explain. Come to think of it I have been chasing a small boost leak on the intercooler outlet and expanded hoses could be the culprit.
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      05-08-2012, 03:21 PM   #16
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Quote:
Originally Posted by Orb View Post
The hose wants to blow from the pressure which is the least path of resistance. The clamp purpose is to counter those forces. It is not possible for a clamp to make a full seal under any circumstances. If the hose has expanded due to oil contamination it will require a much higher clamping force and may leak at higher boost levels regardless and may not throw a code. I had this problem and now solved. There is not much to debate as this is a very well know issue and mostly ignored by the aftermarket. One will need to do their own research to validate my comments instead of making assumtions.
so are you using the fluro hose to fix your issue?
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      05-08-2012, 04:02 PM   #17
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so are you using the fluro hose to fix your issue?
I am using the hose from the link i posted so yes to your question. The lined hose is the best option.
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      05-08-2012, 04:22 PM   #18
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Quote:
Originally Posted by PINeely View Post
Considering pressure physics and the ability of the hoses to swell this actually makes perfect sense, thanks for taking the time to explain. Come to think of it I have been chasing a small boost leak on the intercooler outlet and expanded hoses could be the culprit.

It ends up be being cheaper just replacing the hoses than chasing down the issue. I never threw a code so people shouldn't expect one. The problem has been ongoing for some time as it was only leaking at higher boost levels. The silicone hose will leak at some point (for everyone) and you will be able see fresh oil vapor at the leak point. You will notice turbo lag, flat power delivery, minor boost oscillations and 5-15% reduction in gas mileage that seems to happen all of sudden then gets worse.
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      01-29-2013, 08:05 PM   #19
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Confused by the link provided

Orb,

The link you provided shows short little couplings, not an entire hose. My 335i just popped it hose from the throttlebody under hard acceleration and after reading your comment Im looking to upgrade the hose. So what is it from that link I need to order exactly?

Thanks a lot in advance!!
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