Subject: 3.17 Box
Paul,
Torsion plate connection, Milo
That is what Ross used. Ken Welter destroyed a couple of them. With a belt no less.
Springs don't damp. That is why cars have shock absorbers.
Here is my suggestion. Use silicon rubber. It is tough as nails and is high temp.
Comes in a tube at the hardware store or you can buy it at MacMaster in cured sheet form.
Absorb that torsional vibration in the form of heat.
Paul Lamar
Paul,
You are responsible for jarring my memory, you should be ashamed of yourself!
The flex plate we have does not have the 4 lightning holes next to the E shaft.
All of Daves cracks emanate from those 4 holes.
Additionally Daves plate has several other perforations, 4 to be exact that did not crack out suggesting the maximum stress point is next to the E shaft mounting hole.
If I remember correctly Mazda had problems with the same plate.
An examination with Daves plate used thinner material.
Our plate is not welded to the drive ring on the inside of the plate, only on the outside.
Maybe there is some hope here.
In any case maybe your Red cement about 1/2 inch thick applied to the inner 6" ring might change the vibratory nature of the inner ring just enough to make the difference.
Any way since we are going to use the flex plate for ground engine runs we will try it.
Perhaps a simple thin, 6" load spreading washer on the E shaft with your Red stuff will do the trick.
Milo
Yes. I know.
Another factor in Daves flex plate failure was pulling 2 or more G's at Reno.
A race plane is in a continuous state of turning. That places a gyroscopic bending load on the plate and the output shaft on the gear box due to prop inertia.
This was made worse by tracy's coupling plate adding to the rotational inertia of the flex plate.
My suggestion is do away with all torque loads on the flex plate and let it do the job of starting the engine.
Our new silicone rubber coupling does just that because it is bolted on to the rear counter weight. (Front of engine on a tractor.)
Paul Lamar
Where is the guide on how to build the current (working) version of the silicone dampner? I saw a lot of versions but has any of them been tested or fit up correctly? Is it on the website?
Marc
I have a kit of parts that you weld up with instructions. $100 cash.
Paul Lamar
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