03 Expy Light Bar mounted Now vibration

[scoot0073]

Got my light bar mounted and now when I get 50 mph + it makes a soft vibration .
Does anyone know how to stop the vibration ??

I'm assuming the vibration is caused by how the wind funnels around or under the light bar..

Thanks for any advice

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[MR. EDDIE]

Put some double sided tape under the bracket, it should reduce the vibration a bit.

 

[Habbibie]

Use rubber grommets

 

[stamp11127]

1)Remount the bar farther back on the roofline so that it isn't getting blown from the wind coming off the windshield.
2) Add a center support to the bar to reduce the harmonics/buffeting if you don't relocate it.
3) Add stiffer brackets if the bar is rigid. Mount with some type of insulator to soak up the harmonics.

 

[scoot0073]

Put some double sided tape under the bracket, it should reduce the vibration a bit.

Thanks that's a possibility

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[scoot0073]

Use rubber grommets

Use the rubber grommets where ??
I'm assuming between the light bar and the mounts?
Thanks

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[scoot0073]

1)Remount the bar farther back on the roofline so that it isn't getting blown from the wind coming off the windshield.
2) Add a center support to the bar to reduce the harmonics/buffeting if you don't relocate it.
3) Add stiffer brackets if the bar is rigid. Mount with some type of insulator to soak up the harmonics.

Relocating the bar higher up is a thought but I prefer the visor look.
And I was pondering on the thought of adding a center support brace out of rubber to absorb/ stop the vibration.

After further driving I got the vibrations narrowed down between 48 to 60 mph is only when it does the vibration.
Thanks for your advice I think I'm going to try the center brace ..

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[Habbibie]

Use the rubber grommets where ??
I'm assuming between the light bar and the mounts?
Thanks

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No, between the mounts and the roof

 

[scoot0073]

No, between the mounts and the roof

I didn't use the roof mounts that came with the light bar .I used door jam mounts.
But I noticed that the roof mounts that came with the light bar did come with rubber grommets that goes between the mounts and the roof. But definitely makes sense now.
But with me going the door jam method maybe I can find some thin 3/16 thick rubber and put it between the mounts and the door jam ..Thanks for your help

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[Habbibie]

I didn't use the roof mounts that came with the light bar .I used door jam mounts.
But I noticed that the roof mounts that came with the light bar did come with rubber grommets that goes between the mounts and the roof. But definitely makes sense now.
But with me going the door jam method maybe I can find some thin 3/16 thick rubber and put it between the mounts and the door jam ..Thanks for your help

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There u go, you got the idea now, autozone (and similar) sells "make your own gasket) usually 1/8 rubber is sold along side other materials.

 

[scoot0073]

There u go, you got the idea now, autozone (and similar) sells "make your own gasket) usually 1/8 rubber is sold along side other materials.

Thank u brother

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[Hamfisted]

You're gonna get wind noise and harmonics from anything not aerodynamic that you mount up on your roof. Doesn't really matter what you do. It's just something you learn to live with. That's probably why you see more accessories like that mounted in the grill area and not up on the roof. On mine, even a set of Yakima roof rack bars are annoyingly noisy enough to be real buzz-kills. They're quick detach though, and I take 'em off when not in use. Gives the Expy a clean roof-line. That might be an option for you. Make the light-bar quick detachable, so you can take it off when you're not gonna be off-roading it. Mounted in that location it looks like you'd get some hellacious back-scatter from such bright lighting right at the top of your windshield. Do you have to put the visors down when you use the lights?


-Mike

 

[scoot0073]

You're gonna get wind noise and harmonics from anything not aerodynamic that you mount up on your roof. Doesn't really matter what you do. It's just something you learn to live with. That's probably why you see more accessories like that mounted in the grill area and not up on the roof. On mine, even a set of Yakima roof rack bars are annoyingly noisy enough to be real buzz-kills. They're quick detach though, and I take 'em off when not in use. Gives the Expy a clean roof-line. That might be an option for you. Make the light-bar quick detachable, so you can take it off when you're not gonna be off-roading it.


-Mike

Yea wasn't sure if the vibration or soft humming was normal. But it's not loud enough to get annoying so if the rubber in between the mounts and door jam doesn't help then I think I can live with it.
I need to get a level and level out the bar BC it's hard trying to get it even by eye..
But definitely love it

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[MR. EDDIE]

What mounts did u use for the light bar?

 

[scoot0073]

What mounts did u use for the light bar?

I had to make them from scratch out of 1/8 flat stock steel.
It was a a days job to get them both made.
BC one you can't buy them for my Expedition so had no choice since I wanted them in the door jam instead of the roof.

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[the.beast.2008]

I had to make them from scratch out of 1/8 flat stock steel.
It was a a days job to get them both made.
BC one you can't buy them for my Expedition so had no choice since I wanted them in the door jam instead of the roof.

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can you please post some pictures of everything you used and the brackets you used. and what brand and size light bar is it? they dont make any brackets and i really want to make some and yours is perfect. thanks