Let me quote my self..
I said "a bit expensive," not "overpriced" or a "ripoff," or anything
remotely like it. I think the RB26DETT is a Nice motor, but it is a
bit expensive. I think the LS1 is a Nice motor, but a bit expensive.
I think that my DVD player is a nice DVD player, but it was a bit
expensive. See the trend?
I think it's great that you have made extra mounts, and are offering
them to the world. That's why I posted them here! If I didn't
like them I would have posted a "Hey look at these crappy, overpriced, sure
to crack and destroy your Z, kill you and your dog RB mounts" thread.
I am certified to Level II in Dye Penetrant, Eddy Current, & Mag Particle
NDT (Non-Destructive Testing), and have well over a hundred hours in the
classroom learning the various NDT methods and Metallurgical processes.
I have well over 2000 total (documented) hours testing a wide varity of
aircraft parts. Finding cracks is what I do.
There is little differrence in automobile and aircraft stresses. In different
areas on a aircraft the stress may be greater or less than those found in
automobiles. In fact, most of the cracks I find are in low stress areas.
It's not always the BIG stresses that cause cracks, it's the little, continuous
stresses (vibration) that do the most damage. Rubber isolators will
help a great deal in this area.
I'm no machinist but looking at the part it seems it was cut with one type
of cutting tool (bit), and it appears that the bit has flat tip and cuts
with the side (flute?). It seems to me that by changing from the flat tip
to something with a small radius (Ball End Mill?) on the tip would
eliminate the 90 degree corners.
In the above pic. you can see the very nice radius cuts. Any Stress
will be evenly distrubted along the radius. Now look at the sharp
interior corner. Here all the stress will be focused and is the
most likely place for cracks to form. I'm not saying cracks
will form, but if any do, this is where they will probably start.
They are nice mounts and if I were in need of a pair, I certainly
would not rule them out.