consequences of using cracked exhaust manifold?

[Huw Powell]

Derek wrote:
> 
> Hello eveyone,
> 
> I've got a '86 MC engine sitting here with a crack over the #4 exhaust
> runner.
> Archive searching revealed numerous threads on welding vs filling vs duct
> tape.  1 and 2 piece manifolds were also covered, as were the pros and cons
> of some aftermarket replacements.  Nowhere could I find out what happens if
> you just live with the crack.  So I ask, whan can happen if I reuse my
> current 5kt manifold?  My parts person got a really evil grin when I asked
> her about a new manifold, and she said all it does is tick, nothing worse
> (she drives a 5kt)  If the crack just ticks a bit until things warm up and
> expand thats fine with me.  Opinions?

well, you asked for opinions... I think the hot exhaust gas leaking out
will slowly cut that crack larger and larger.  Also, the crack might
grow due to whatever forces created it - unless you are sure you have
removed them I suppose.

-- 
Huw Powell

http://www.humanspeakers.com/audi/

http://www.humanthoughts.org/