Posted for "Mark Ravinski" <mjrav@comcast.net>:

I've had small repairable cracks every several hundred hours or so.  Your
more extensive failure suggests the pipes may have been poorly made with
internal stress or bad materials.  Or, maybe there is not sufficient support
for the length of pipes.  Or, check that the pipes are not hitting any fixed
airframe structure as the engine moves on it's mounts.

Mark Ravinski
N360KB   1387 hrs.