Happy Christmas first of all !!
I went to a guy who does custom exhausts and told me that to modify the existing fire manifold is very dangerous, and that there is no guarantee of the result since it is made of Cast Iron. His advise was to do an adapter or fabricate a new exhaust. What have most of you done please ?!
thanks,
neil
By far the majority have modified the standard exhausts by the cut and weld on a substantial plate method.
Yes, it does involve dissimilar welding.
Yes, it wouldn't be an ideal choice
Yes, sometimes the welds crack (generally small cracks which can be fairly easily spotted)
But, the majority stay intact. You can buy dissimilar arc rods, or TIG with stainless rod. In both cases, pre-heating and slow cooling (warm workshop, no draughts) are pretty much essential.
The folk with most experience of dissimilar welding tend to be the folk who do "wrought iron" gates. Or talk to a "real" welding company. Many folk doing custom exhausts are not coded, and have very limited experience of anything but simple MIG welding.
A bolt on adaptor will site the oil return far too low. This will destroy the turbo very quickly indeed.
It's possible to make a manifold out of so-called "weld-els". These are thick sections of tubing (available in various bends and straight sections) in steel and stainless. They're used for high pressure steam or chemical processes, and are thick, which is important for strength, durability, and heat retention. This is a better way of doing it, but unless you can do the fabrication yourself, it'll be expensive.
The "original" Cinq turbos all used a cut'n shut standard manifold.........
