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+--- Thread: exhaust manifold wall thickness (/showthread.php?tid=17188)
exhaust manifold wall thickness - Jonny81191 - 09-09-2013
If I was to weld up an exhaust manifold in mild steel, what wall thickness tubing would be best? I'd be supporting it at both ends, so I'm only really concerned about heat absorption and prolonging the lifespan of it.
RE: exhaust manifold wall thickness - Dum-Dum - 09-09-2013
from what ive seen it appears that people use standard thickness exhaust tubing.
RE: exhaust manifold wall thickness - Rippthrough - 09-09-2013
If you're not taking the weight off a turbo, etc, 1.6mm will be fine.
If you want it to last a bit longer I suppose you could use 2mm.
RE: exhaust manifold wall thickness - Jonny81191 - 09-09-2013
I was thinking about 3mm, is there any reason not to use that?
RE: exhaust manifold wall thickness - Poodle - 09-09-2013
Should think itd start getting difficult to weld at that kind of thickness wouldnt it? Thicker it is the more energy itll carry to the turbo.
RE: exhaust manifold wall thickness - Jonny81191 - 09-09-2013
Nah 3mm is easy enough to weld. But I'm more concerned about the lifespan tbh. Don't want it cracking
RE: exhaust manifold wall thickness - Ruan - 09-09-2013
3mm!
Christ, you looking to hang some serious weight off it!?!? 3.2mm is Scaffold pole you realise and I think we'd both agree Scaff is just a little over the top for an exhaust, also SERIOUSLY heavy in like 2.5"!!!
2-2.2mm max I'd say!
RE: exhaust manifold wall thickness - Jonny81191 - 09-09-2013
See that's where I need help
I'm aware of how thick 3mm wall is, but I'm wanting this to last, hence my question. I'm also considering using thinner stuff further away from the head after the collector.
RE: exhaust manifold wall thickness - darrenjlobb - 09-09-2013
2mm tbh.
I wouldnt go any thinner if your welding it yourself, as can be tricky, any thicker and it gets heavy, but no harm for a home build....like if i was on a budget, and had scafold kicking about, then it would come out....just like it did when i welded ruans VNT adapter....lol.... agri spec ftw
RE: exhaust manifold wall thickness - Rippthrough - 09-09-2013
(09-09-2013, 01:40 PM)Jonny81191 Wrote: Nah 3mm is easy enough to weld. But I'm more concerned about the lifespan tbh. Don't want it cracking
The tube I've got for doing mine is 1.2mm
RE: exhaust manifold wall thickness - cully - 09-09-2013
3mm is good if your using a stick welder