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Old 07-08-2010, 01:43 PM   #1
Token-Negro
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Default Welding on OEM Intake manifolds

Possibly going to modify a OEM intake manifold to reposition the throttle body and wondering how well the Cast manifold does being welded too? Is it pretty dirty? I was going to have it media blasted before hand to clean it up.
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Old 07-08-2010, 02:11 PM   #2
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They weld very good as long as there is no oil inside them. Be careful with media blasting as this can impregnate its self into the manifold causing the issues you are trying to avoid
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Old 07-08-2010, 04:09 PM   #3
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Originally Posted by Crawford Performance View Post
They weld very good as long as there is no oil inside them. Be careful with media blasting as this can impregnate its self into the manifold causing the issues you are trying to avoid
Would walnut blasting solve this problem?
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Old 07-08-2010, 04:31 PM   #4
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Walnut blasting is safe when it comes to welding aluminum. It's prety safe on sheet metal as well!
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Old 07-08-2010, 06:56 PM   #5
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Yeah i think ill just buy a new SS wire wheel and wire wheel the paint off that way, should get me a clean surface.
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Old 07-09-2010, 11:53 AM   #6
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That will work.
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Old 07-09-2010, 01:14 PM   #7
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Does anyone have first hand experience with welding an oem manifold? Opinions? I need to weld two spots on one and want some background info before hand. Thanks
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Old 07-09-2010, 02:47 PM   #8
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Does anyone have first hand experience with welding an oem manifold? Opinions? I need to weld two spots on one and want some background info before hand. Thanks
I weld alot of cast parts and if you want my opinion I'm gonna tell you it's not a big deal. I hear everyone saying get it blasted but in my experience it's not necessary. As long as it's prepped properly there shouldn't be any problems getting it to seal.
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Old 07-09-2010, 07:26 PM   #9
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My main concern is that I have two holes on the runners and the wall thickness is thin. After it's welded though, I want to smooth it out flush.
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Old 07-09-2010, 07:34 PM   #10
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Have at it, the intake manifolds weld great if they are clean!
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Old 07-09-2010, 07:41 PM   #11
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Alright, thanks. I'll report back with a follow up.
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Old 07-09-2010, 07:43 PM   #12
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If you pre-heat the manifold it will weld much nicer
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Old 07-09-2010, 11:10 PM   #13
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Just a swag, but it is probably real close to 356 Al. I'd try using settings and rod for 356. It's going to be a little different as it will be Japanese alloy.
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Old 07-11-2010, 09:43 PM   #14
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Blasting aluminum with any media as a pre-cleaning to welding is going to do more harm than good. It may look nice, but the blasting just embeds dirt further into the casting. It probably wont make much of a difference with walnut media on a clean casting, but using sand or oxide media on dirty castings will make getting a good weld almost impossible.

Really all you should ever need is a clean SS wire brush and acetone/alcohol.
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Old 10-14-2010, 03:35 PM   #15
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I got the hole on the right runner welded now. I'm in the process of sanding it down to make it look like there never was a hole. Hopefully it'll come out that way.
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