Paul,
After much thought I have 2 thoughts for left side motor mount.#1 use
5/8 tube from upper firewall attach point (relocate expansion tank)down
to the horizontal rectangal that runs parallel to the engine. Add
another5/8 tube from the lower left firewall attach point up to a
common point with upper tube.Leaving existing intake as is, this common
point would be about 6" from the existing 5/8 tube attach point at the
forward end of motor mount. This results in the 1"by 1.75"by 1/16 wall
rect.taking up the load between the two attach points.#2 move muffler
and use P-port intake to make more room for proper engine mount.? In
your last reply I did not get a green line showing where to cut exist.
intake plenum.Thanks again for the help
Geir
OK Geir. Make a sketch of the firewall with dimensions
of the existing hard points and thrust line shown.
I'll draw in the existing motor mount and we will see what fits
where. Also the dia and length of the muffler. You might
as well keep most of it.
I'll do a 3D in about a week when I get back from the Tokyo
Motor Show.
Here is the jpg showing the green line.
Paul Lamar..... No rotor no motor!
With the addition of the "red" struts, all being in tension under
right-side-up flight, the owner could remove that lower tube which is the
one dangerously in compression, I think. It does serve to reduce the
compression force of the main rectangular tubing beam against the vertical
(parallel to the firewall) part of the mount at the firewall, but maybe not
appreciably. Removing it will not alter the loads at the firewall
hard points, only way the rearward force against the rear vertical tube is
distributed. Is removing 12 oz worth it (there was one on the other side,
too, correct? - 24 oz)? Will the vertical rect. tubing take the bending
moment of the main beam against it at X g's?
Jim Beckman
Austin.
I would not trust the vertical rectangular to take the back load
from the upper diagonals alone. However as you say this load
goes away once a proper upper and lower diagonal is in place.
Then all it sees is the light down load from the firewall end of the
longitudinal s. The lower diagonals should probably be
replaced with 3/4 inch for buckling reasons. Leaving
the rectangular stuff in probably mitigates some of the
compressive loads on the small lower diagonals.
I should do a 3D if I had time showing all the loads.
Perhaps after Tokyo MS.
I'll say one thing for the builder... he sure crammed a quart
into a pint pot. The original builder, Jim Wilhauer, is a
professional welder.
Paul Lamar ....No rotor no motor!
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