Will check the garage to make sure I have the flange - I don't want anything for it
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| Exhaust manifold weld els http://www.gt4dc.co.uk/forum/viewtopic.php?f=1&t=6995 |
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| Author: | Insanity-74 [ Sun Mar 16, 2014 12:50 pm ] |
| Post subject: | Exhaust manifold weld els |
Just quickly, would 304 stainless schedule 30 weld els be suitable for an exhaust manifold? And does anyone know where I could get a flange made up or one that's already available? |
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| Author: | Kris [ Sun Mar 16, 2014 4:21 pm ] |
| Post subject: | Re: Exhaust manifold weld els |
304 isn't the best... 321 should be better I think I have a 304 flange in the garage if it's of any use? |
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| Author: | Insanity-74 [ Sun Mar 16, 2014 5:47 pm ] |
| Post subject: | Re: Exhaust manifold weld els |
I think I will do one in mild steel first, a template. 321 stainless is expensive and difficult to obtain. Would be slightly annoyed if I buggered it up. The flange might be of use though, how much do you want for it? |
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| Author: | Insanity-74 [ Sun Mar 16, 2014 7:56 pm ] |
| Post subject: | Re: Exhaust manifold weld els |
Looks like 321 stainless is nearly impossible to find, 304 might be the only choice. Hopefully a sched 40 304 pipe should be strong enough. Easier to weld too. 316 is a option if that's better? |
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| Author: | Dan [ Sun Mar 23, 2014 10:43 am ] |
| Post subject: | Re: Exhaust manifold weld els |
You probably won't find weld els in 321, it's meant for very high temperature applications rather than steam pipe that weld els are intended for. 321 pipe and elbows should be readily available from metal suppliers, but it is expensive due to it's less common, more specialist use, and the addition of Ti (which provides it with much better thermal cycle performance than the more common alloys). 304/316 will crack fairly quickly, especially with the weight of a turbo dangling off it, or if you restrain it from expanding along the pipes length. You might just be better off sticking with a mild steel and accepting it will surface rust. |
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| Author: | Kris [ Sun Mar 23, 2014 1:35 pm ] |
| Post subject: | Re: Exhaust manifold weld els |
Will check the garage to make sure I have the flange - I don't want anything for it
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| Author: | Insanity-74 [ Sun Mar 23, 2014 4:30 pm ] |
| Post subject: | Re: Exhaust manifold weld els |
Dan wrote: You probably won't find weld els in 321, it's meant for very high temperature applications rather than steam pipe that weld els are intended for. 321 pipe and elbows should be readily available from metal suppliers, but it is expensive due to it's less common, more specialist use, and the addition of Ti (which provides it with much better thermal cycle performance than the more common alloys). 304/316 will crack fairly quickly, especially with the weight of a turbo dangling off it, or if you restrain it from expanding along the pipes length. You might just be better off sticking with a mild steel and accepting it will surface rust. Well mild steel would be a whole bunch easier, and cheaper. Can it be normally mig welded or do I need special wire? There's plenty of VHT paint I could paint it with. |
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| Author: | Dan [ Sun Mar 23, 2014 7:16 pm ] |
| Post subject: | Re: Exhaust manifold weld els |
Yeah plain normal MIG wire will be fine. |
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| Author: | Insanity-74 [ Sun Mar 23, 2014 8:31 pm ] |
| Post subject: | Re: Exhaust manifold weld els |
What's the best size piping to go for, 2"? |
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| Author: | Dan [ Mon Mar 24, 2014 9:16 am ] |
| Post subject: | Re: Exhaust manifold weld els |
No, try to make it about the same size as the standard runners (unless you are building a massively powerful engine?). You want to keep runner area down to keep velocity up. |
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| Author: | Insanity-74 [ Mon Mar 24, 2014 6:37 pm ] |
| Post subject: | Re: Exhaust manifold weld els |
what is the standard ID of the exhaust runners? |
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| Author: | Dan [ Mon Mar 24, 2014 9:07 pm ] |
| Post subject: | Re: Exhaust manifold weld els |
Don't remember mate, I've been out of this game too long! I do remember that they're oval, not circular and vary depending on the cylinder they go to due to the exit angles from the head. When I was looking at making my own exhaust manifold I seem to recall 38mm rang a bell. |
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