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Old 03-25-2013, 12:28 PM   #1
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Default S4 manifold

Looking for a s4 manifold!
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Old 04-12-2013, 02:40 PM   #2
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Still looking for s4 manifold!
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Old 04-12-2013, 03:02 PM   #3
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Old 04-12-2013, 03:08 PM   #4
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Quote:
Originally Posted by sturovo View Post
that is wrong and please don't spread mis-information like that.

they're the same design, because one is a knockoff of the other, but not the same quality or material
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Old 04-12-2013, 04:23 PM   #5
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Quote:
Originally Posted by 18psi View Post
that is wrong and please don't spread mis-information like that.

they're the same design, because one is a knockoff of the other, but not the same quality or material
But are they are different? Any definitive proof? I interpreted Corky's post to mean they are the same (as in the same).

Quote:
Originally Posted by Corky Bell View Post
Aricjm15: You are quite correct, the ebay piece and mine are the same. We made a proto, sent it to a maker in China, received a bunch of nice pieces, then found the same thing for sale on ebay. I have to admit, I was warned.
In any case both versions crack in the same way and same time frame when the downpipe is supported correctly.

https://www.miataturbo.net/build-thr...e2/#post992615

All is not lost, Begi has come up with a fix.
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Old 04-12-2013, 04:40 PM   #6
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I wasn't aware there was a ebay knockoff, are they still for sale..havent seen any. I'm looking for the begi quality one.
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Old 04-12-2013, 05:03 PM   #7
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The correct fix would be not using 1/32" wall tubing.
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Old 04-12-2013, 09:28 PM   #8
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look same =/= same

But yes, they look exactly the same. Just use different metal
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Old 04-13-2013, 04:50 PM   #9
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Interesting idea 18psi. So which different metal would that be? Any specifics?

http://www.bellengineering.net/produ...products_id=40
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Old 04-13-2013, 08:21 PM   #10
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the thickness of it. both use ss
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Old 04-14-2013, 02:54 AM   #11
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Theres different SS ratings too. I didnt know they use similar ****, i always thought they made their own in house. Hmm.
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Old 04-14-2013, 11:06 AM   #12
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I measured an ebay s4. It looks like it they use 38mm x 1mm tubing.
I wonder how this compares to the original part?
Attached Thumbnails
S4 manifold-p1030371.jpg   S4 manifold-p1030369.jpg  
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Old 04-15-2013, 05:48 PM   #13
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MX-5 Miata Forum - View Single Post - Turbo- Cast manifold VS Welded Stainless

Quote:
Please don't take this as I am dissing the S4 manifold. I'm not. It has it's place and purpose. But, I am honest and up front about how much or if it will crack. If you do not support a SS manifold, the failure rate is 100%. If you over support a SS manifold, the failure rate is 100%. If you support it just enough, like we do, the failure rate is about 40%. Hence, the extended warranty on it.
Stephanie
OP, irregardless of where you get the thin wall S4 from 40% fail even when supported correctly according to the manufacturer.
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Old 04-15-2013, 06:00 PM   #14
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Well only reason I want s4 is because I alrdy have the downpipe. I have no problem going with a cast manifold, I just wanted something to bolt up to the stock exhaust.
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Old 04-15-2013, 06:28 PM   #15
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Quote:
Originally Posted by sturovo View Post
But are they are different? Any definitive proof? I interpreted Corky's post to mean they are the same (as in the same).



In any case both versions crack in the same way and same time frame when the downpipe is supported correctly.

https://www.miataturbo.net/build-thr...e2/#post992615

All is not lost, Begi has come up with a fix.
This fix, do they perform this for a minimal fee? A part that is designed with a 60-100% structural failure in mind should have an "extended warranty"
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Old 04-15-2013, 06:30 PM   #16
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The new S4 should last for ever as it uses shed 40 mild steel but costs $$$ BEGi S4 Miata Exhaust Manifold 1990-2005 BEGi
A used thin wall s4 will probably not last. There are no readily available s4 replacement manifolds afik. I made my own for that reason. https://www.miataturbo.net/diy-turbo...e3/#post995562
I think your best option in this case is 1994 1995 1996 1997 Mazda Miata Turbo Manifold MX 5 1 8 | eBay[/URL]
The most important thing with the s4 is using a brace something like this one.
Miata Turbo S4 Manifold Support Brace BEGi
With luck it will last for a few years.
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