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That does not sound right to me, normally you expect vacuum to be HIGHEST
at idle and fall off as RPM's increase. Do you know which model of the
Delco distributor you have? IIRC there was one that had a vacuum retard,
instead of advance.
WRT your overheating, check your fan clutch. That sounds like it is not
getting enough air.
On Mon, Jan 11, 2021 at 2:03 PM Bud Rolofson <levilevi@comcast.net> wrote:
> I=E2=80=99m using dual 1 1/4=E2=80=9D SU carbs. The front carb has a vacu=
um connection
> right at the butterfly that pulls no vacuum at idle but 9 psi at > 2000 r=
pm
> when the butterfly opens.
>
>
> On Jan 11, 2021, at 12:03 PM, John Innis <jdinnis@gmail.com> wrote:
>
> What carb are you using and where on the carb is the vacuum line
> connected? DGV's are notorious for this, because carb vacuum line is NOT=
a
> manifold vacuum source, it is a venturi vacuum source.
>
> On Mon, Jan 11, 2021 at 12:34 PM Bud Rolofson <levilevi@comcast.net>
> wrote:
>
>> Listerati,
>>
>> I=E2=80=99m trouble shooting a overheating problem at highway speeds (65=
-70mph)
>> with my 69 Spitfire. Temp gage goes to red at higher speeds but then
>> immediately cools off when idling.
>>
>> I suspect I have a bad or weaken vacuum advance on my Spitfire=E2=80=99s=
delco
>> remy (friggin spell check made me type that over and over) distributor. =
I
>> tested the vacuum line from the carb and it gets to 9 psi where the line
>> connects to the vacuum advance when the engine is at 2500-3000 RPM.
>>
>> The problem is there is no movement to advance the timing that I can see
>> by watching the vernier advance knob, it does not move at 2500-3000 rpm.
>>
>> Two questions:
>>
>> Should 9 psi be enough for the vacuum advance to work properly? I
>> couldn=E2=80=99t find specs for vacuum advances.
>>
>> If the vernier knob isn=E2=80=99t moving then is the vacuum advance not =
working
>> or the centrifugal weights not moving? Or maybe both?
>>
>> Thanks
>> Bud
>>
>> Extreme Parts Racing (more than just a haircut)
>>
>> 71TR6 CC57365 (Good 6)
>> 71 Spitfire MK IV Race Car #3
>> 69 Spitfire MK III (back up FE engine/dinghy car)
>> 93 Minnie Winnie Race Support Vehicle
>> 77 Z-50A Hardly Davidson Honda Mini-Trail Bike (Triumph Pit Bike)
>>
>> ** triumphs@autox.team.net **
>>
>> Donate: http://www.team.net/donate.html
>> Archive: http://www.team.net/pipermail/triumphs
>> http://www.team.net/archive
>>
>> Unsubscribe/Manage:
>> http://autox.team.net/mailman/options/triumphs/jdinnis@gmail.com
>>
>
>
> --
> =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D
> =3D Never offend people with style when you =3D
> =3D can offend with substance --- Sam Brown =3D
> =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D
>
>
> Bud Rolofson
>
> Extreme Parts Racing (more than just a haircut)
>
> 71TR6 CC57365 (Good 6)
> 71 Spitfire MK IV Race Car #3
> 69 Spitfire MK III (back up FE engine/dinghy car)
> 93 Minnie Winnie Race Support Vehicle
> 77 Z-50A Hardly Davidson Honda Mini-Trail Bike (Triumph Pit Bike)
>
>
--=20
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D
=3D Never offend people with style when you =3D
=3D can offend with substance --- Sam Brown =3D
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D
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<div dir=3D"ltr"><div>That does not sound right to me, normally you expect =
vacuum to be HIGHEST at idle and fall off as RPM's increase.=C2=A0 Do y=
ou know which model of the Delco distributor you have?=C2=A0 IIRC there was=
one that had a vacuum retard, instead of advance.=C2=A0 <br></div><div>WRT=
your overheating, check your fan clutch.=C2=A0 That sounds like it is not =
getting enough air.=C2=A0 <br></div><div><br></div></div><br><div class=3D"=
gmail_quote"><div dir=3D"ltr" class=3D"gmail_attr">On Mon, Jan 11, 2021 at =
2:03 PM Bud Rolofson <<a href=3D"mailto:levilevi@comcast.net";>levilevi@c=
omcast.net</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"overflow-wrap: break-word;">I=E2=80=99m using dual=
1 1/4=E2=80=9D SU carbs. The front carb has a vacuum connection right at t=
he butterfly that pulls no vacuum at idle but 9 psi at > 2000 rpm when t=
he butterfly opens.<div><br></div><div><br><div><blockquote type=3D"cite"><=
div>On Jan 11, 2021, at 12:03 PM, John Innis <<a href=3D"mailto:jdinnis@=
gmail.com" target=3D"_blank">jdinnis@gmail.com</a>> wrote:</div><br><div=
><div dir=3D"ltr">What carb are you using and where on the carb is the vacu=
um line connected?=C2=A0 DGV's are notorious for this, because carb vac=
uum line is NOT a manifold vacuum source, it is a venturi vacuum source. =
=C2=A0<br></div><br><div class=3D"gmail_quote"><div dir=3D"ltr" class=3D"gm=
ail_attr">On Mon, Jan 11, 2021 at 12:34 PM Bud Rolofson <<a href=3D"mail=
to:levilevi@comcast.net" target=3D"_blank">levilevi@comcast.net</a>> wro=
te:<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">Listerati,<b=
r>
<br>
I=E2=80=99m trouble shooting a overheating problem at highway speeds (65-70=
mph) with my 69 Spitfire. Temp gage goes to red at higher speeds but then i=
mmediately cools off when idling.<br>
<br>
I suspect I have a bad or weaken vacuum advance on my Spitfire=E2=80=99s de=
lco remy (friggin spell check made me type that over and over) distributor.=
I tested the vacuum line from the carb and it gets to 9 psi where the line=
connects to the vacuum advance when the engine is at 2500-3000 RPM.<br>
<br>
The problem is there is no movement to advance the timing that I can see by=
watching the vernier advance knob, it does not move at 2500-3000 rpm.<br>
<br>
Two questions:<br>
<br>
Should 9 psi be enough for the vacuum advance to work properly?=C2=A0 I cou=
ldn=E2=80=99t find specs for vacuum advances.<br>
<br>
If the vernier knob isn=E2=80=99t moving then is the vacuum advance not wor=
king or the centrifugal weights not moving? Or maybe both?<br>
<br>
Thanks<br>
Bud <br>
<br>
Extreme Parts Racing (more than just a haircut)<br>
<br>
71TR6 CC57365 (Good 6)<br>
71 Spitfire MK IV Race Car #3<br>
69 Spitfire MK III (back up FE engine/dinghy car)<br>
93 Minnie Winnie Race Support Vehicle <br>
77 Z-50A Hardly Davidson Honda Mini-Trail Bike (Triumph Pit Bike)<br>
<br>
** <a href=3D"mailto:triumphs@autox.team.net"; target=3D"_blank">triumphs@au=
tox.team.net</a> **<br>
<br>
et=3D"_blank">http://www.team.net/donate.html</a><br>
Archive: <a href=3D"http://www.team.net/pipermail/triumphs"; rel=3D"noreferr=
er" target=3D"_blank">http://www.team.net/pipermail/triumphs</a>=C2=A0 <a h=
ref=3D"http://www.team.net/archive"; rel=3D"noreferrer" target=3D"_blank">ht=
tp://www.team.net/archive</a><br>
<br>
hs/jdinnis@gmail.com" rel=3D"noreferrer" target=3D"_blank">http://autox.tea=
m.net/mailman/options/triumphs/jdinnis@gmail.com</a><br>
</blockquote></div><br clear=3D"all"><br>-- <br><div dir=3D"ltr">=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D<br>=3D Never offend people with style when you=C2=A0=C2=A0 =
=3D<br>=3D can offend with substance --- Sam Brown=C2=A0 =3D<br>=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D</div>
</div></blockquote></div><br><div>
Bud Rolofson<br><br>Extreme Parts Racing=C2=A0(more than just a haircut)<br=
><br>71TR6 CC57365 (Good=C2=A06)<br>71 Spitfire MK IV Race=C2=A0Car #3<br>6=
9 Spitfire MK III (back=C2=A0up FE engine/dinghy car)<br>93 Minnie Winnie R=
ace=C2=A0Support Vehicle=C2=A0<br>77 Z-50A Hardly=C2=A0Davidson Honda Mini-=
Trail Bike (Triumph Pit=C2=A0Bike)
</div>
<br></div></div></blockquote></div><br clear=3D"all"><br>-- <br><div dir=3D=
"ltr" class=3D"gmail_signature">=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D<br>=3D Never offe=
nd people with style when you=C2=A0=C2=A0 =3D<br>=3D can offend with substa=
nce --- Sam Brown=C2=A0 =3D<br>=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D</div>
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