[DeTomaso] A-arm bushings...should they require machining?
cengles at cox.net
cengles at cox.net
Fri Sep 22 11:05:13 EDT 2017
Dear Julian,
Ack! I wasn't paying attention. I thought the
bushings were polyurethane rather than rubber. From what little I know,
I agree with your recommendation to custom modify them for proper
fitment.
Warmest regards, Chuck Engles
On Fri, Sep 22, 2017 at 9:29 AM, Julian Kift wrote:
Chuck,
I think the difference here is oem rubber style bushings designed to be
a press fit vs. aftermarket poly bushings. We recently had a long
discussion on the merits of each, so won't rehash that, but I'm aligned
with Joseph's thinking that 0.003" would be the expected interference
fit for a bushing of this size. At 0.008" over, I'd probably turn them
down or failing access to a lathe at least spin them up on a sander to
lose some of that oversize.
If I recall correctly there is a very slight splay on the A-arms to
effect starting the press fit.
Julian
___________________________________
From: DeTomaso <detomaso-bounces at server.detomasolist.com> on behalf of
Charles Engles <cengles at cox.net>
Sent: Thursday, September 21, 2017 6:11 PM
To: 'Joseph F. Byrd, Jr.'; detomaso at server.detomasolist.com
Subject: Re: [DeTomaso] A-arm bushings...should they require machining?
Dear Joe,
I don't know.
I do know that twenty odd years ago when I
converted
both Panteras to polyurethane bushings from Pantera Performance Center,
they
went in with just finger/hand pressure. No press needed. Obviously,
they
must have been smaller than yours and I don't understand why there is
such a
great difference.
Puzzled, Chuck Engles
-----Original Message-----
From: DeTomaso [ mailto:detomaso-bounces at server.detomasolist.com
<javascript:parent.wgMail.openComposeWindow('detomaso-bounces at server.detomasolist.com')>
] On Behalf
Of Joseph F. Byrd, Jr.
Sent: Thursday, September 21, 2017 5:32 PM
To: detomaso at server.detomasolist.com
Subject: [DeTomaso] A-arm bushings...should they require machining?
I have removed the bushings from the front A-Arms and have found their
ODs
to be a consistent 1.184". the A-arm bore IDs varied slightly around
1.181". this makes sense as the IDs would be 30mm with the bushings
oversized for MY expected press fit of ~ 0.003".
NOW, the new bushing ODs vary around 1.189". to ME, that is way too
much
press and could plastic yield the A-arm bores.
Is it expected to machine the new bushing ODs? (Pretty common practice
for
new parts to be oversized for field fitting in the machines I use to
work
to allow for possible damage/wear.)
OR
Throw away the micrometers and get a bigger press?
Joe/5177
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-------------- next part --------------
Dear Julian,
Ack! I wasn't paying attention. I thought the
bushings were polyurethane rather than rubber. From what little I
know, I agree with your recommendation to custom modify them for proper
fitment.
Warmest regards, Chuck Engles
On Fri, Sep 22, 2017 at 9:29 AM, Julian Kift wrote:
Chuck,
I think the difference here is oem rubber style bushings designed to be
a press fit vs. aftermarket poly bushings. We recently had a long
discussion on the merits of each, so won't rehash that, but I'm aligned
with Joseph's thinking that 0.003" would be the expected interference
fit for a bushing of this size. At 0.008" over, I'd probably turn them
down or failing access to a lathe at least spin them up on a sander to
lose some of that oversize.
If I recall correctly there is a very slight splay on the A-arms to
effect starting the press fit.
Julian
___________________________________
From: DeTomaso <detomaso-bounces at server.detomasolist.com> on behalf of
Charles Engles <cengles at cox.net>
Sent: Thursday, September 21, 2017 6:11 PM
To: 'Joseph F. Byrd, Jr.'; detomaso at server.detomasolist.com
Subject: Re: [DeTomaso] A-arm bushings...should they require machining?
Dear Joe,
I don't know.
I do know that twenty odd years ago when I
converted
both Panteras to polyurethane bushings from Pantera Performance Center,
they
went in with just finger/hand pressure. No press needed. Obviously,
they
must have been smaller than yours and I don't understand why there is
such a
great difference.
Puzzled, Chuck Engles
-----Original Message-----
From: DeTomaso [ [1]mailto:detomaso-bounces at server.detomasolist.com] On
Behalf
Of Joseph F. Byrd, Jr.
Sent: Thursday, September 21, 2017 5:32 PM
To: detomaso at server.detomasolist.com
Subject: [DeTomaso] A-arm bushings...should they require machining?
I have removed the bushings from the front A-Arms and have found their
ODs
to be a consistent 1.184". the A-arm bore IDs varied slightly around
1.181". this makes sense as the IDs would be 30mm with the bushings
oversized for MY expected press fit of ~ 0.003".
NOW, the new bushing ODs vary around 1.189". to ME, that is way too
much
press and could plastic yield the A-arm bores.
Is it expected to machine the new bushing ODs? (Pretty common practice
for
new parts to be oversized for field fitting in the machines I use to
work
to allow for possible damage/wear.)
OR
Throw away the micrometers and get a bigger press?
Joe/5177
_______________________________________________
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Posted emails must not exceed 1.5 Megabytes
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