This is fascinating... outside the box; why even use springs? Why not just try
lockwire instead? And is it the expansion contraction of the loop itself that
is possibly causing the fatigue crack?? If the loops have no set distance apart
then spring tensions will be all over the place; so are the higher or lower
tensioned spring loops cracking? Additionally there is no support fixing on many
of these rotax 912 muffler boxes; all the modal energy generated is transfered
directly through the header pipes; this is just nuts
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