[DeTomaso] Poly vs. Rubber suspension bushings

Thu Apr 9 17:33:32 EDT 2020

I forget exactly what the offset ratio is to degrees of caster, but I think that 0.100" gets you about another degree, IMO optimal for a narrow body car is a total of about 4.5 degrees, for a wide body 6.5 degrees.

The front a-arm modification produces an almost infinitely adjustable caster up to about 7.5 degrees. I have collected maybe 5 or 6 pairs of a-arms over a period to modify and will have to blitz them out one of these weekends when I'm locked in with nothing else to do.....

Julian
________________________________
From: DeTomaso <detomaso-bounces at server.detomasolist.com> on behalf of Mike Drew via DeTomaso <detomaso at server.detomasolist.com>
Sent: Thursday, April 9, 2020 2:19 PM
To: richard at richardgreenblum.com <richard at richardgreenblum.com>
Cc: detomaso at server.detomasolist.com <detomaso at server.detomasolist.com>
Subject: Re: [DeTomaso] Poly vs. Rubber suspension bushings

Richard,

Not quite. You can’t easily increase caster with the bushings. But it’s easy to increase caster by simply machining .100” off the back side of the upper front ball joints. I believe Jack DeRyke pioneered this, although I’m not sure.

I’ve done it on every car I’ve worked on, with great effect.

Mike

Sent from my iPad

> On Apr 9, 2020, at 13:15, "richard at richardgreenblum.com" <richard at richardgreenblum.com> wrote:
>
> The only downside I see to the rubber bushings is you can’t increase caster.
>
> Richard
> Austin, TX
>
>
>> On Apr 9, 2020, at 14:13, Paul A Rimov <rimovp at gmail.com> wrote:
>>
>> Million dollar super cars that have vastly more sophisticated suspensions and chassis still use rubber bushings.
>>
>> rimovp at gmail.com
>>
>>
>>
>>>> On Apr 9, 2020, at 12:30 AM, charlesmccall at gmail.com wrote:
>>>
>>>    Hi all
>>>
>>> I decided to take advantage of being away from my car to fix a
>>> long-time engine oil leak by removing my suspension, radiator, etc
>>> 😊
>>>
>>>
>>> You know how these things go... I asked the guy to check the car over
>>> while he had the engine out, and the task list is growing, so my car is
>>> in a bunch of pieces right now.
>>>
>>>
>>> Mike Drew is helping source parts for me, and he asked if I wanted poly
>>> or rubber bushings. I know that this subject has been discussed a
>>> million times, but I didn't take notes. My specific question:
>>>
>>>
>>>  1. Is it commonly accepted that poly is better but will squeak without
>>>     proper lubrication? Rubber is maintenance-free but degrades over
>>>     time and doesn't work quite as well?
>>>  2. How difficult is it to lubricate them? Is this a matter of
>>>     installing a zerk fitting and zapping it once a year? Do you wipe
>>>     it on? How easy is it to access them without a lift?
>>>
>>> Thank you!
>>> _______________________________________________
>>>
>>>
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>> _______________________________________________
>>
>>
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>
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-------------- next part --------------
   I forget exactly what the offset ratio is to degrees of caster, but I
   think that 0.100" gets you about another degree, IMO optimal for a
   narrow body car is a total of about 4.5 degrees, for a wide body 6.5
   degrees.

   The front a-arm modification produces an almost infinitely adjustable
   caster up to about 7.5 degrees. I have collected maybe 5 or 6 pairs of
   a-arms over a period to modify and will have to blitz them out one of
   these weekends when I'm locked in with nothing else to do.....

   Julian
     __________________________________________________________________

   From: DeTomaso <detomaso-bounces at server.detomasolist.com> on behalf of
   Mike Drew via DeTomaso <detomaso at server.detomasolist.com>
   Sent: Thursday, April 9, 2020 2:19 PM
   To: richard at richardgreenblum.com <richard at richardgreenblum.com>
   Cc: detomaso at server.detomasolist.com <detomaso at server.detomasolist.com>
   Subject: Re: [DeTomaso] Poly vs. Rubber suspension bushings

   Richard,
   Not quite. You can't easily increase caster with the bushings. But it's
   easy to increase caster by simply machining .100" off the back side of
   the upper front ball joints. I believe Jack DeRyke pioneered this,
   although I'm not sure.
   I've done it on every car I've worked on, with great effect.
   Mike
   Sent from my iPad
   > On Apr 9, 2020, at 13:15, "richard at richardgreenblum.com"
   <richard at richardgreenblum.com> wrote:
   >
   > The only downside I see to the rubber bushings is you can't increase
   caster.
   >
   > Richard
   > Austin, TX
   >
   >
   >> On Apr 9, 2020, at 14:13, Paul A Rimov <rimovp at gmail.com> wrote:
   >>
   >> Million dollar super cars that have vastly more sophisticated
   suspensions and chassis still use rubber bushings.
   >>
   >> rimovp at gmail.com
   >>
   >>
   >>
   >>>> On Apr 9, 2020, at 12:30 AM, charlesmccall at gmail.com wrote:
   >>>
   >>>    Hi all
   >>>
   >>> I decided to take advantage of being away from my car to fix a
   >>> long-time engine oil leak by removing my suspension, radiator, etc
   >>> 😊
   >>>
   >>>
   >>> You know how these things go... I asked the guy to check the car
   over
   >>> while he had the engine out, and the task list is growing, so my
   car is
   >>> in a bunch of pieces right now.
   >>>
   >>>
   >>> Mike Drew is helping source parts for me, and he asked if I wanted
   poly
   >>> or rubber bushings. I know that this subject has been discussed a
   >>> million times, but I didn't take notes. My specific question:
   >>>
   >>>
   >>>  1. Is it commonly accepted that poly is better but will squeak
   without
   >>>     proper lubrication? Rubber is maintenance-free but degrades
   over
   >>>     time and doesn't work quite as well?
   >>>  2. How difficult is it to lubricate them? Is this a matter of
   >>>     installing a zerk fitting and zapping it once a year? Do you
   wipe
   >>>     it on? How easy is it to access them without a lift?
   >>>
   >>> Thank you!
   >>> _______________________________________________
   >>>
   >>>
   >>> Detomaso Email List is not managed by POCA
   >>> Posted emails must not exceed 1.5 Megabytes
   >>> DeTomaso mailing list
   >>> DeTomaso at server.detomasolist.com
   >>> [1]http://server.detomasolist.com/mailman/listinfo/detomaso
   >>>
   >>> To manage your subscription (change email address, unsubscribe,
   etc.) use the links above.
   >>>
   >>> Members who post to this list grant license to the list to forward
   any message posted here to all past, current, or future members of the
   list. They also grant the list owner permission to maintain an archive
   or approve the archiving of list messages.
   >> _______________________________________________
   >>
   >>
   >> Detomaso Email List is not managed by POCA
   >> Posted emails must not exceed 1.5 Megabytes
   >> DeTomaso mailing list
   >> DeTomaso at server.detomasolist.com
   >> [2]http://server.detomasolist.com/mailman/listinfo/detomaso
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   etc.) use the links above.
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   >> Members who post to this list grant license to the list to forward
   any message posted here to all past, current, or future members of the
   list. They also grant the list owner permission to maintain an archive
   or approve the archiving of list messages.
   >
   > _______________________________________________
   >
   >
   > Detomaso Email List is not managed by POCA
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   > DeTomaso at server.detomasolist.com
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   use the links above.
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   _______________________________________________
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