welding a 1.8L flange onto greddy manifold..possible?? - Miata Turbo Forum - Boost cars, acquire cats.

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DIY Turbo Discussion greddy on a 1.8? homebrew kit?

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Old 09-19-2009, 11:39 PM   #1
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Default welding a 1.8L flange onto greddy manifold..possible??

Ok my crank nose in the 1.6L forced me to swap motors. I now have a 1.8L. Is it possible to get a 1.8L flange welded onto the greddy manifold? Has anybody done that?

I know there is the EDT manifold, but if I was going to spend 450 for it I might as well sell off this kit and get a Begi or something.
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Old 09-19-2009, 11:55 PM   #2
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Not gonna happen, sorry.
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Old 09-20-2009, 12:06 AM   #3
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Well I only got the idea because I was looking at solomiata.com

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I wanted to keep my 1.6 Racing Beat header because the oxygen sensor would be in the correct location. It's located in the downpipe the 1.8, while the 1.6 has it in the header tubes, so if you use a 1.8 header and the 1.6 downpipe, you'll have no oxygen sensor fitting unless you add one. I cut the flanges off both headers and had the 1.8 flange welded on the 1.6 header tubes by O'Hare Auto Body in Elk Grove Village, IL.
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Old 09-20-2009, 12:14 AM   #4
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The manifold is cast, I would not recommend it. It will crack.
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Old 09-20-2009, 12:21 AM   #5
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Quote:
Originally Posted by medisyn View Post
Ok my crank nose in the 1.6L forced me to swap motors. I now have a 1.8L. Is it possible to get a 1.8L flange welded onto the greddy manifold? Has anybody done that?

I know there is the EDT manifold, but if I was going to spend 450 for it I might as well sell off this kit and get a Begi or something.
I don't think its a good idea, but:

Just think of this as a great excuse to upgrade from a mediocre/entry level turbo system to a good one
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Old 09-20-2009, 12:22 AM   #6
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sell the greddy and buy another system man.
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Old 09-20-2009, 12:30 AM   #7
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I know it's not ideal, but isn't this what BEGI does w/ their external wastegate manifolds? I spoke to Corky about this and he said they've never had one fail.

Didn't they do this to Brain's intake manifold too?

I know you have to heat it up before welding and heat it again while cooling down. Something about throwing it into sand as well.
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Old 09-20-2009, 12:58 AM   #8
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Quote:
I wanted to keep my 1.6 Racing Beat header because the oxygen sensor would be in the correct location. It's located in the downpipe the 1.8, while the 1.6 has it in the header tubes, so if you use a 1.8 header and the 1.6 downpipe, you'll have no oxygen sensor fitting unless you add one. I cut the flanges off both headers and had the 1.8 flange welded on the 1.6 header tubes by O'Hare Auto Body in Elk Grove Village, IL.
Pretty sure they're talking about cutting the flange where the two header sections, upper and lower, meet, not the head flange.

Welding cast aluminum is way different than welding cast iron. Cast is a bitch to weld because of the high carbon content. It's doable but doing all 4 runners would be a pita, and thats an understatement. Then there's the issue of port spacing

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Old 09-20-2009, 01:16 AM   #9
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Originally Posted by ARTech View Post
Pretty sure they're talking about cutting the flange where the two header sections, upper and lower, meet, not the head flange.

Welding cast aluminum is way different than welding cast iron. Cast is a bitch to weld because of the high carbon content. It's doable but doing all 4 runners would be a pita, and thats an understatement. Then there's the issue of port spacing

I you are right, I totally misread it. That picture pretty much says, sell the greddy! I wonder what a fair sale price is these days....
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