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A bit of tangent, but a question for the gurus: There are basically two
types of LSDs: clutch-pack type, which is most common, and 'mechanical'
types, most common being Torsen (I assume we're talking about a
clutch-pack type here). The clutch-pack type essentially locks the two
axles together for straight-line traction, but gives enough to allow the
rear wheels to rotate at different rates, for turning. Torsen uses
complex gearing to somehow sense torque differences to allow the rear
wheels to work independently when necessary.
The clutch-pack type, like any clutch, has friction plates that wear and
eventually need replacing, and the additives--sometimes called 'friction
modifiers'--allow more slippage, which kind of obviates the purpose of
the LSD, which is to allow us to do two-wheel burnouts in our Healeys,
right? My '08 Mustang, when new, would sometimes get a bit 'grabby' in
hard (for a non-racer, cornering) but by the time I traded it in at 112K
miles I felt it had lost most of this characteristic, but it was hardly
noticeable most of the time. But, my '19 Mustang with Torsen sometimes
gets a bit grabby in corners, too.
So, for a daily driver, what is the advantage of an LSD (esp. with a
clutch-pack type, which will eventually need disk replacement)? And, how
do you know when your clutch disks are shot, except that you can't do
two-wheel burnouts? In my Healeys I use Redline EP gear oil, which comes
with or without the friction modifier, which can also be added from a
separate bottle (sometimes I buy the 'wrong' stuff but, without LSDs I
don't think it makes a difference).
On 3/30/2022 5:21 AM, Michael Salter via Healeys wrote:
> Hi Allan, we encountered exactly the same issue with AHX12 during it's
> first Targa Newfoundland.
> A long-time performance rallyer solved the problem for us completely
> by recommending that we add half a bottle of A C Delco Limited Slip
> Differential Lubricant Additive Part # 992694.
> This additive immediately and completely eliminated the low speed
> shudder and jumping issues.
>
> M
>
> On Wed., Mar. 30, 2022, 1:39 a.m. Allan Peters via Healeys,
> <healeys@autox.team.net> wrote:
>
> I have a 1954 Bn1 with a 4 stud , presumably spiral bevelÂ
> axle. It currently has an LSD which does not like parkingÂ
> manoevers. Any tght lock and the wheels are jumping aroundÂ
> !!!! As a quick fix am thinking a used diff would be the
> answer.So my question is does anyone on the list have one of these
> Diffs. please ?? Any advice very welcome !!  Have beenÂ
> filling and sanding a UVL hardtop for weeks now so need to try
> and erase it from my mind
> Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Cheers !!
> Â Â Allan
>
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A bit of tangent, but a question for the gurus: There are basically
two types of LSDs: clutch-pack type, which is most common, and
'mechanical' types, most common being Torsen (I assume we're talking
about a clutch-pack type here). The clutch-pack type essentially
locks the two axles together for straight-line traction, but gives
enough to allow the rear wheels to rotate at different rates, for
turning. Torsen uses complex gearing to somehow sense torque
differences to allow the rear wheels to work independently when
necessary.<br>
<br>
The clutch-pack type, like any clutch, has friction plates that wear
and eventually need replacing, and the additives--sometimes called
'friction modifiers'--allow more slippage, which kind of obviates
the purpose of the LSD, which is to allow us to do two-wheel
burnouts in our Healeys, right? My '08 Mustang, when new, would
sometimes get a bit 'grabby' in hard (for a non-racer, cornering)
but by the time I traded it in at 112K miles I felt it had lost most
of this characteristic, but it was hardly noticeable most of the
time. But, my '19 Mustang with Torsen sometimes gets a bit grabby in
corners, too.<br>
<br>
So, for a daily driver, what is the advantage of an LSD (esp. with a
clutch-pack type, which will eventually need disk replacement)? And,
how do you know when your clutch disks are shot, except that you
can't do two-wheel burnouts? In my Healeys I use Redline EP gear
oil, which comes with or without the friction modifier, which can
also be added from a separate bottle (sometimes I buy the 'wrong'
stuff but, without LSDs I don't think it makes a difference).<br>
<br>
<br>
<div class="moz-cite-prefix">On 3/30/2022 5:21 AM, Michael Salter
via Healeys wrote:<br>
</div>
<blockquote type="cite"
cite="mid:CAB3i7L+Ep6u=c99ysej1BA36dgqTiBAj77jEA_VPhEc2B676fA@mail.gmail.com">
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
<div dir="auto">Hi Allan, we encountered exactly the same issue
with AHX12 during it's first Targa Newfoundland.Â
<div dir="auto">A long-time performance rallyer solved the
problem for us completely by recommending that we add half a
bottle of A C Delco Limited Slip Differential Lubricant
Additive Part # 992694.</div>
<div dir="auto">This additive immediately and completely
eliminated the low speed shudder and jumping issues.</div>
<div dir="auto"><br>
</div>
<div dir="auto">M</div>
</div>
<br>
<div class="gmail_quote">
<div dir="ltr" class="gmail_attr">On Wed., Mar. 30, 2022, 1:39
a.m. Allan Peters via Healeys, <<a
href="mailto:healeys@autox.team.net"; moz-do-not-send="true"
class="moz-txt-link-freetext">healeys@autox.team.net</a>>
wrote:<br>
</div>
<blockquote class="gmail_quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex">
<div>
<div style="font-family:Helvetica
Neue,Helvetica,Arial,sans-serif;font-size:13px">
<div dir="ltr">I have a 1954Â Bn1Â with a 4 stud ,Â
presumably spiral bevel axle. It currently has anÂ
LSD which does not like parking manoevers. Any tght
lock and the wheels are jumping around !!!! As a
quick fix am thinking a used diff would be the
answer.So my question is does anyone on the list have
one of these Diffs. please ?? Any advice very
welcome !!  Have been filling and sanding a UVLÂ
hardtop for weeks now so need to try and erase it from
my mind</div>
<div dir="ltr">Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â
    Â
                    Â
Cheers !!  Â
  Allan</div>
</div>
</div>
<br>
</blockquote>
</div>
</blockquote>
<br>
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