I 'm going to start the exhaust manifold in titanium.
I have to procure materials and know roughly the radius of the tubes so as to bend them .
The engine is a 2.0 zetec.
It did any of you , who already have an exhaust manifold made ​​of stainless steel , the opportunity to let me have maybe tube diameters?
Thanks

Not saying you shouldn't (more interested), but what advantage does Titanium offer over stainless? The cost will be higher and from what I know it's harder to weld as well.

The advantage that I'm interested in and less weight which if done in titanium. About 45% less weight
Welding and how welding stainless steel . Three very important things are : cleaning , gas Argon 6.0 , and solder in an oxygen free atmosphere .
As for the cost I agree with you , it's not cheap But since I have both the opportunity and the right equipment is costing me only the material .

OK makes sense if you have the tools and equipment to do it. Material only cost makes it more reasonable. I must admit that I didn't factor the weight saving bonus.

I tried to weld stainless tube to titanium on an R1 can with my mig. I accept I don't know what I'm doing but it didn't work at all!

The reason is simple : You can be welded titanium with titanium. Just try to weld titanium with stainless steel welding is just break you've finished weld

When we made our Phoenix exhaust we carried out a "cut and shut" operation using two standard Fireblade manifolds.
Welding was easy according to Eldon.
Titanium has another plus point. It looks nice.

I want to try to bend the tubes so as to have the least possible welds .
The thickness of the tubes and approximately 1mm .
The diameter of the primary tubes and 46mm . secondary 52mm in the end he goes to 65mm .
Unless someone correct me with other more tested or rather measures