P'cola FD

I was thinking today about how many turbos get all cracked up, and was thinking of why that would happen. I know to an extent it's unavoidable, but I think that one big reason for the cracks is that people start pushing the engine before everything is fully warmed up. I know I used to hammer it right after my water temps came up, until I read how stupid that is. I think that the extreme heat expanding the inside of the turbo manifold, pushes the inside against the colder outside, and leaves it with no place to go other than to stress and eventually crack. Anybody want to explain why I am wrong, or add anything to this?
--Danny

duboisr

Garfinkle was told some years ago that the cast hot parts do not have enought nickel in them to resist cracks. He ground out the edges on one of his sets and had them welded back with nickel rod, then they were milled down flat. they have no cracks after 20k miles. When the turbos are repaired they will be used again .A seal spit throught one wheel