Looking for copper
Does anyone make a thick copper exhaust manifold gasket? Like the Mr. Gaskets they make for SR20DET cars? I have a reoccurring exhaust leak between the 3rd and 4th runner on my turbo manifold. I am going to put the manifold on a belt sander to make sure its level at the flange was hopping that a thicker gasket could help fill any other gaps in. Plus the copper is malleable to help form to any problems.
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Don't finish a manifold with a belt sander.
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it's either straight or it's not.
don't be janky |
Dude, this is a job for a machinist. You're looking to spend hundreds of bucks on bandaids to avoid sending in your manifold for 100 dollars worth of work to make it straight.
In your defense, I tried the janky ways first and they sort of work, but really it's better to just mate two straight surfaces to each other in the first place. |
Originally Posted by AlwaysBroken
(Post 1263975)
Dude, this is a job for a machinist. You're looking to spend hundreds of bucks on bandaids to avoid sending in your manifold for 100 dollars worth of work to make it straight.
In your defense, I tried the janky ways first and they sort of work, but really it's better to just mate two straight surfaces to each other in the first place. |
how does it "help" with heat and sealing?
how about you do like all the other successful people here do: use the stock gasket (new or reused), and install a manifold with a true surface. |
Adding a 3rd metal into the mix is not the answer.
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I don't think I can recall hearing of anyone making or using a solid copper exhaust gasket on a Miata (the OEM gaskets work pretty darn well).
If you really want to do this, you're probably going to have to make your own. You can purchase copper sheet from OnlineMetals here: Order Copper 110 Plate in Small Quantities at OnlineMetals.com For what it's worth, I can't imagine this not being worse than an OEM stainless steel gasket. Even the folks here making hilarious amounts of power for extended durations on the track are using 'em. Are your exhaust manifold studs coming loose? |
Originally Posted by jankymiata
(Post 1264165)
I'm going to pull the turbo manifold and put it on a level surface and use my feeler gauges to see if it's flat
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he's throught this through, trust him
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Water levels naturally. Just set the flange slowly on a standing puddle. Whichever part hits the water first should be sanded down.
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Originally Posted by concealer404
(Post 1264308)
Water levels naturally. Just set the flange slowly on a standing puddle. Whichever part hits the water first should be sanded down.
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I'm still trying to wrap my head around the idea of using a belt-sander to level an exhaust flange.
You might as well use an axe. |
I'm not sure what you guys are so shocked at, but many fabricators including abe and tim belt sand their manifolds
...heads, on the other hand |
2 Attachment(s)
What makes it alright for the head, but not the manifold?
Do not want. Doesn't mean it can't be done, still do not want. 6x36 something belt sander, that'd do it. https://www.miataturbo.net/attachmen...ine=1441763723 https://www.miataturbo.net/attachmen...ine=1441763723 That won't do it. |
1 Attachment(s)
Originally Posted by deezums
(Post 1264442)
What makes it alright for the head, but not the manifold?
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Janky You can use a 6x36 floor belt sanderlayed flat, not vertical and it well work fine if you are careful and go at it slowly. I did it to mine as it developed a small crack in a weld and I reinforced the area with some gussets and I didn't think it would warp the flange but it did. It ended up with about 1/16" warp high in the center out to each end. I painted it with some blueing and used a 80 grit belt to surface the warp out and it has been working fine for sometime now.
I agree with the others that the OEM gasket is the best, that a solid copper one would not solve anything and would probably make things worse. I had some issues with the studs backing out even when using new pinch nuts. The issue is the surface that contacts the manifold flange on the backside of the nuts is smooth so when the stud heats up it backs out. I bought some NORD washers and haven't had any issues since. The back 2 studs seem to be the most prone to doing this. I bought mine at Fastenal and I know FM sells them also. Just google nord lockwashers. Good luck |
Weld little beads around your ports then sand/machine. How far proud these should be...I don't know. Not much or else you'll warp the flange worse once it's bolted down.
https://www.miataturbo.net/attachmen...1&d=1441800855 I recommend using the factory metal gasket and not caring about a little soot on your flange as much. |
When I took off my exhaust manifold this weekend I noticed it was bulging in the middle (tested with a straightedge). I have no idea why this has happened as it is a huge beefy log manifold from JGS and it's been on and off the car since 2002-2003 with no problems. There is a bit of soot around the 1 and 4 exhaust ports.
What could I have done to cause it to warp? I ceramic coated it inside and out a few years ago but I wouldn't think that would cause problems. Will getting it machined flat fix the problem or is this one of those things where the shape changes as it heats up? The joking around i this thread is making me doubt what I think I know. |
Originally Posted by AlwaysBroken
(Post 1264576)
When I took off my exhaust manifold this weekend I noticed it was bulging in the middle (tested with a straightedge). I have no idea why this has happened as it is a huge beefy log manifold from JGS and it's been on and off the car since 2002-2003 with no problems. There is a bit of soot around the 1 and 4 exhaust ports.
What could I have done to cause it to warp? I ceramic coated it inside and out a few years ago but I wouldn't think that would cause problems. Will getting it machined flat fix the problem or is this one of those things where the shape changes as it heats up? The joking around i this thread is making me doubt what I think I know. |
There is absolutely nothing wrong with using a floor sitting 36" belt sander. Read my post above, nbr 17. You aren't surfacing a cyl. head. Just use your straight edge and some bluing or slightly spray it with some paint. Just take it slow and set the manifold back on the sander flat. The machine shop wanted to much to build a jig to hold the manifold. I did another guys car this way and both have done fine with absolutely no issues. I also refresh the surface of the turbo flange and where it mounts to the manifold surfaces when I have them apart for any reason, no big deal.
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Originally Posted by jmann
(Post 1265749)
There is absolutely nothing wrong with using a floor sitting 36" belt sander. Read my post above, nbr 17. You aren't surfacing a cyl. head. Just use your straight edge and some bluing or slightly spray it with some paint. Just take it slow and set the manifold back on the sander flat. The machine shop wanted to much to build a jig to hold the manifold. I did another guys car this way and both have done fine with absolutely no issues. I also refresh the surface of the turbo flange and where it mounts to the manifold surfaces when I have them apart for any reason, no big deal.
That works if it's a good belt sander (a real one like you say, big and flat) and the person using it knows how to use it. I've surfaced things myself too, so I know it can work. Still having it machined flat would 100% for sure result in it being flat, having it belt sanded somewhere will 100% make it shiny, and maybe flat depending on the shop and operator. |
Reread his post. He said he was going use a belt sander and you and a few others said that wasn't a good idea, so evidently he has access to one. Alot of people have them in their garage as they are handy for alot of other things and they don't cost that much at HF. IF he has the skill, it is as good as way of doing it and it is free. It ain't brain surgery. My post was to let him know that his idea of doing it that way is fine and has been done by others and it WORKS. Have a good day.
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Originally Posted by jmann
(Post 1265788)
Reread his post. He said he was going use a belt sander and you and a few others said that wasn't a good idea, so evidently he has access to one. Alot of people have them in their garage as they are handy for alot of other things and they don't cost that much at HF. IF he has the skill, it is as good as way of doing it and it is free. It ain't brain surgery. My post was to let him know that his idea of doing it that way is fine and has been done by others and it WORKS. Have a good day.
Anyways, we agree it can work. I hand-surfaced turbo flanges, and every cylinder head on my car, including on the one on there now at 28 PSI. I know it can be done and work. If you know what you're doing and have the right equipment. |
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