I am going to build a turbo manifold with butt weld fittings (1.25" NB schd 10) for my mid engined Minor and have been researching materials etc. The car is street driven and I expect 300bhp maximum with the turbo.
I understand that 304 and 316 are rated to 300 degree C and 321 800 degree C. What does this rating mean? Is it where carbide precipitation will occur? What does this mean in real terms? Surely strength is not really an issue with the size of the pipes and loads of the turbo, unless expansion stresses are the limiting factor?
321 seems to be the material of choice. However so far quotes for the fittings have been around 6 times that of 304L or 316L. I have even found a company that will make me 90 degree bends if I supply the straight pipe.
A lot of manifolds are constructed from 304L. Any experience of how they hold up to the high temperatures? My installation will see high temps. Previously my NA manifold was wrapped and it burnt off every 800 miles or so.
Any advice would be appreciated.
Thanks
John
I understand that 304 and 316 are rated to 300 degree C and 321 800 degree C. What does this rating mean? Is it where carbide precipitation will occur? What does this mean in real terms? Surely strength is not really an issue with the size of the pipes and loads of the turbo, unless expansion stresses are the limiting factor?
321 seems to be the material of choice. However so far quotes for the fittings have been around 6 times that of 304L or 316L. I have even found a company that will make me 90 degree bends if I supply the straight pipe.
A lot of manifolds are constructed from 304L. Any experience of how they hold up to the high temperatures? My installation will see high temps. Previously my NA manifold was wrapped and it burnt off every 800 miles or so.
Any advice would be appreciated.
Thanks
John