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This fix is probably best for new motor mounts using existing beams.
It lowers the beam and inch or so and consequently it raises
the thrust line an inch or so if the motor mount is already welded
up. If new mount is being made the mount can be adjusted to get the
thrust line in the right place.  The four plates are .065 thick
4130. Best to put the nuts on the back side of the flex
plate.
Paul Lamar
Also clears the counter weight.
Paul Lamar
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Hi Paul,

Since the box beams were bent up to match the width of Tracy's  spacers,
the tabs would make it too wide, so the existing beams couldn't be  used
with this mod.  How about welding a supporting structure to the bottom
of the beam in the center where the box structure has been cut  back?  I
would think the box could be cut back to a 'U' section in the  center if
the right strengthing member were added to the bottom.

Bob W.


http://www.bob-white.com
N93BD - Rotary Powered BD-4 (real soon)
Prewired EC2 Cables - http://www.roblinphoto.com/shop/

Please measure your beam width for me Bob. Should only be 2.70  inches wide.

The spacing between plate and engine should be 3.050 or 3.080 I forget
which.

If the spacer lengths are less than that you might have a problem  with your PSRU.

Paul Lamar

Bob. the sheet metal portion of the S-beam is less than the length of
the bushings as Paul said.  Without looking it  up, I think the
bushings are 3.07.   I am going to remove material from the upper
flange of  my S-beam to create clearance for the dampner and then
test it for strength.  I suspect it will be just fine without
further  reinforcement.  I will do this next week.  Stay tuned.    Jerry