joe, i think you have answered the question by saying you have not
experienced a rise in vibrations with this soft (40 duro) urethane
mount.
design looks good with what appears to be adequate segregation of the
internal metal components. my experience suggests you need at least
5-6 mm of urethane all around the support plates for the bolts. this
allows enough internal movement before the urethane goes into
compression "lock-up" eg, as the box rocks around on start up).
mounts like this are typically "tuned" by changing the location, size
and shape of voids cast into the urethane in the lower part. this is
the step that most custom mount makers ignore , but what separates a
really good design from the rest. this will only come from real life
experiences or ideally, from setting up accelerometers on the box and
doing tests on various designs.
good luck, i'll buy one when ready. keep me in the loop
Terry
On 22 May 2013 08:48, Joe Alexander <n197tr4@cs.com> wrote:
> I sent Terry the design of the A.R.E. Mount. I also indicated that I
> understood his first two paragraphs.
>
> I asked for a clarification of the third paragraph as I didn't understand
> what he was asking.
>
> I did share that we experienced no increase in driveline vibration.
>
> We have not tried this design in our street TRs yet, but have the expectation
> that this 40 durometer rear mount will perform well.
>
> It is clear that Terry has a very wide range of experience in body and frame
> isolation. There is certainly something to be learned and will be looking
> forward to his reply.
>
> Any other points of discussion?
>
> Joe A
> Sent from my iPad
>
> On May 21, 2013, at 4:55 PM, "Enquiries Road & Track"
> <enquiries@roadandtrack.net.au> wrote:
>
>> Joe
>>
>> i get involved with urethane & hard rubber mounts on a daily basis.
>> my impression of urethane mounts is they are fine in race cars and
>> crappy elsewhere as they just don't have the resilience of rubber, so
>> they transmit a lot of vibrations that rubber mounts absorb. we have
>> experimented here with all sorts and grades of both rubber and
>> urethane.
>>
>> we have removed really hard urethane mounts from modern race/rally
>> cars as they been a major factor in fatigue cracking the steel
>> bodywork where the mounting plate affixes. notable examples are Toyota
>> GT4 and Mitsu Evo lancer, where we have changed to custom rubber
>> mounts (harder duro, different voiding compared with factory) and
>> totally solved the mount problems
>>
>> whilst i understand the TR is a lot sturdier than these 2 examples,
>> and the same is unlikely to occur, can you please comment on the
>> vibration aspects in respect to what you have planned for the TR rear
>> mount.
>>
>> thanks
>>
>> Terry
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