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As I understand it, you are correct. As the weight swings outward, the
advance increases. Heavier springs or lighter weights delays the advance;
lighter springs or heavier weights speeds up the advance.
But...
The springs are sometimes loosely mounted (especially in emission-control
distributors?) such that the weight can swing out a tiny bit without being
affected by the spring at all. Thus, a distributor that holds timing after
TDC at idle can quickly jump ahead a few degrees when the throttle is
cracked open, advancing to before TDC. The advance curve can then operate
"normally" as the throttle opening (and RPM) increase. Sometimes you see
two different weights and/or two different springs to cause specific
effects on timing throughout the RPM range.
Jeff Scarbrough
Corrosion Acres, Ga.
On Thu, Mar 5, 2020 at 1:56 AM DAVID MASSEY <dave1massey@cs.com> wrote:
> I may be wrong here but I thought the springs resisted the pull from the
> weights and stiffer springs would make the advance come on more slowly.
>
> Dave
>
>
>
> -----Original Message-----
> From: Peter Arakelian <PeterAra@msn.com>
> To: triumphs@autox.team.net <triumphs@autox.team.net>
> Sent: Sun, Mar 1, 2020 1:39 pm
> Subject: [TR] distributor advance
>
> > Wouldn't stiffer springs give you less advance at idle and, hence, more
> advance at speed?<
>
> That was my initial thought, too. However, the way the system appears to
> work is that the weights pull out no matter which spring is used. The
> springs determine how much of that pull is transferred to the distributor=
=E2=80=99s
> advance. A stiffer spring will follow the pull of the weight more close=
ly
> giving you advance sooner. This was also borne out by what actually
> occurred. When I put the stiffer springs in the idle timing advanced by
> 10-15 degrees.
>
>
> Sent from Mail for Windows 10
>
> ** triumphs@autox.team.net **
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<div dir=3D"ltr">As I understand it, you are correct.=C2=A0 As the weight s=
wings outward, the advance increases.=C2=A0 Heavier springs or lighter weig=
hts delays the advance; lighter springs or heavier weights speeds up the ad=
vance.<div><br></div><div>But...</div><div><br></div><div>The springs are s=
ometimes loosely mounted (especially in emission-control distributors?) suc=
h that the weight can swing out a tiny bit without being affected by the sp=
ring at all.=C2=A0 Thus, a distributor that holds timing after TDC at idle =
can quickly jump ahead a few degrees when the throttle=C2=A0is cracked open=
, advancing to before TDC.=C2=A0 The advance curve can then operate "n=
ormally" as the throttle opening (and RPM) increase.=C2=A0 Sometimes y=
ou see two different weights and/or two different springs to cause specific=
effects on timing throughout the RPM range.</div><div><br></div><div>Jeff =
Scarbrough</div><div>Corrosion Acres, Ga.</div></div><br><div class=3D"gmai=
l_quote"><div dir=3D"ltr" class=3D"gmail_attr">On Thu, Mar 5, 2020 at 1:56 =
AM DAVID MASSEY <<a href=3D"mailto:dave1massey@cs.com";>dave1massey@cs.co=
m</a>> wrote:<br></div><blockquote class=3D"gmail_quote" style=3D"margin=
:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"=
>
<div style=3D"color:black;font:12pt Arial,Helvetica,sans-serif">
<div> <font size=3D"3">I may be wrong here but I thought the springs resist=
ed the pull from the weights and stiffer springs would make the advance com=
e on more slowly.</font><br>
</div>
<div> <br>
</div>
<div style=3D"clear:both"><font size=3D"4">Dave </font><br>
<br>
</div>
<div> <br>
</div>
<div> <br>
</div>
<div style=3D"font-family:arial,helvetica;font-size:10pt;color:black">-----=
Original Message-----<br>
From: Peter Arakelian <<a href=3D"mailto:PeterAra@msn.com"; target=3D"_bl=
ank">PeterAra@msn.com</a>><br>
To: <a href=3D"mailto:triumphs@autox.team.net"; target=3D"_blank">triumphs@a=
utox.team.net</a> <<a href=3D"mailto:triumphs@autox.team.net"; target=3D"=
_blank">triumphs@autox.team.net</a>><br>
Sent: Sun, Mar 1, 2020 1:39 pm<br>
Subject: [TR] distributor advance<br>
<br>
<div id=3D"gmail-m_-3805619340423951420yiv3074945309">
=20
=20
<div>
<div>
<div>> Wouldn't stiffer springs give you less advance at idle and, h=
ence, more advance at speed?<</div>
=20
<div> =C2=A0</div>
=20
<div>That was my initial thought, too.=C2=A0 However, the way the system ap=
pears to work is that the weights pull out no matter which spring is used.=
=C2=A0 The springs determine how much of that pull is transferred to the di=
stributor=E2=80=99s advance.=C2=A0=C2=A0 A stiffer
spring will follow the pull of the weight more closely giving you advance =
sooner.=C2=A0 This was also borne out by what actually occurred. When I put=
the stiffer springs in the idle timing advanced by 10-15 degrees.<br>
<br>
</div>
<div> =C2=A0</div>
=20
<div>Sent from <a rel=3D"noopener noreferrer">
Mail</a> for Windows 10</div>
<div> =C2=A0</div>
=20
</div>
</div>
</div>
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