Bob Gehres
Spokane WA
1940 D300 International
What you see here is the top mounts which you will have viewed before
but your focus should be on the square tubing welded on the flat area
Which is part of the support that extends to the centre mounts
Here you can see the upright supports that bolt to the centre mounts, Bob has put a lot of thought into mounting the Aluminum radiator and shroud
The semi-circle pieces that form
the shroud cradle are in fact bolted right to the shroud
itself.
After I worked with all that some, it dawned on me that with vibrations from the fan ..... which all do have to some degree ......
After I worked with all that some, it dawned on me that with vibrations from the fan ..... which all do have to some degree ......
I decided to try this setup with the brackets fully bolted in. With self locking nuts and fender washers where possible it should do the trick.
Might still have to add some cushioning on the places where the brackets attach to the cab framing, but for now it is all bolted in solid.
The shroud will have fully rubber protected edges though, so hopefully that will be sufficient. The actual radiator mounts are of course all rubber stuff.
One of the design aspects in the
shroud mounting was to figure out how to isolate its
vibrations via the fan so the radiator was not chewed up over
time.
I have done a run check with a battery attached to the fan, and it does not at this point send noticable vibration into the radiator.
Time will tell if all this works as planned. The actual shape of the shroud brackets being circular is that way intentionally.
The fan motion being circular does create what is called in engineering terms a "rotational harmonic" .... which is simpler terms
is basically a vibration much like what you see when a rock is dropped in water. Those circular ripples that are sent outwards from
where the rock hits are what is created in a circular moving fan. Those circular vibrations can be absorbed if you create a mounting system
that can absorb in a similar shape all that shaking. Once the vibrations are dampened by the mounts, the chances of the radiator having to
do the absorption is significantly reduced. At least that is the theory ... so once into use, it will hopefully actually work?? (grin)
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To next pageI have done a run check with a battery attached to the fan, and it does not at this point send noticable vibration into the radiator.
Time will tell if all this works as planned. The actual shape of the shroud brackets being circular is that way intentionally.
The fan motion being circular does create what is called in engineering terms a "rotational harmonic" .... which is simpler terms
is basically a vibration much like what you see when a rock is dropped in water. Those circular ripples that are sent outwards from
where the rock hits are what is created in a circular moving fan. Those circular vibrations can be absorbed if you create a mounting system
that can absorb in a similar shape all that shaking. Once the vibrations are dampened by the mounts, the chances of the radiator having to
do the absorption is significantly reduced. At least that is the theory ... so once into use, it will hopefully actually work?? (grin)