Can anyone answer the above question as to whether the 1/4" 6061 with
   3/8 NPT threads will be strong enough for the 100 psi or so of the oil
   system?  I suppose one approach would be to test it to 300 psi.

   Scott Gettings

Scott,
Full engagenment is better if you are talking about the threads failing.
On a 3/8 npt a full thread form is closer to !/2 inch. The threads would
probably hold for a while in 1/4" material, but if they fatague later
the failure could be spectacular, and possibly deadly. No reason to
skimp here, get !/2 plate and if you feel that it's too heavy remove
some of the other material by pocketing the plate. Remember that most of
the failures we have had in the rotary community have been caused by the
accessories and external systems, not the engine itself. I encourage you
to "do the whole job" here. You will worry less later.
Bill Jepson

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