Classic Mustangs List Archive

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Mail From: ffacker (Fred Facker)


The vac advance was connected to the ported vacuum up on the side of the Holley carburetor. I've never tried running it to the full vacuum down on the bottom of the Holley.
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Mail From: shawkins6 (Steve Hawkins)

That's normally where it should be hooked up. That way you shouldn't
get any vacuum advance at idle. Aren't you located in Spring?



Steve Hawkins



-----Original Message-----
From: (email redacted)
[mailtoemail redacted)] On Behalf Of Fred
Facker
Sent: Monday, May 09, 2005 10:44 AM
To: (email redacted)
Subject: [CM] Re: Classic-mustangs Digest, Vol 26, Issue 10



The vac advance was connected to the ported vacuum up on the side of the
Holley carburetor. I've never tried running it to the full vacuum down
on the bottom of the Holley.

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Mail From: mahilly (Mike H)

I have always had my (67 289 A code) vacuum advance connected to
manifold vacuum. Disconected and plugged when adjusting the innitial
timing (6 btdc). Then reconnect, which then advances the timing out
further during idle. Is that not the correct procedure???

On 5/9/05, Steve Hawkins <(email redacted)> wrote:
> That's normally where it should be hooked up. That way you shouldn't get
> any vacuum advance at idle. Aren't you located in Spring?
>
>
>
>
> Steve Hawkins
>
>
>
> -----Original Message-----
> From: (email redacted)
> [mailtoemail redacted)] On
> Behalf Of Fred Facker
> Sent: Monday, May 09, 2005 10:44 AM
> To: (email redacted)
> Subject: [CM] Re: Classic-mustangs Digest, Vol 26, Issue 10
>
>
>
> The vac advance was connected to the ported vacuum up on the side of the
> Holley carburetor. I've never tried running it to the full vacuum down on
> the bottom of the Holley.
> _______________________________________________
> Classic-mustangs mailing list
> (email redacted)
> lists.twistedpair.ca/mailman/listinfo.cgi/classic-mustangs
>
>

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Mail From: walt.boeninger (Walt Boeninger)

No, that is not correct. You don't want advance at idle.
It should be connected to the carb, above the throttle
plates, so it sees NO vacuum at idle. As soon as the throttle
opens, it gets vacuum to advance the spark for acceleration
until enough RPM is achieved to get into the centrifigal
advance.

Connecting to manifold vacuum means you're always advanced
above static setting.....

...but in the big scheme of things it probably doesn't matter
that much... just emissions......

Walt

Mike H wrote:

> I have always had my (67 289 A code) vacuum advance connected to
> manifold vacuum. Disconected and plugged when adjusting the innitial
> timing (6 btdc). Then reconnect, which then advances the timing out
> further during idle. Is that not the correct procedure???
>
> On 5/9/05, Steve Hawkins <(email redacted)> wrote:
>
>>That's normally where it should be hooked up. That way you shouldn't get
>>any vacuum advance at idle. Aren't you located in Spring?
>>
>>
>>
>>

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Mail From: mahilly (Mike H)

I checked my advance again and found that the the vacuum line is
connected to the only available port on the carb...on the back side
right below the air cleaner seat (it's a 2V Autolite). The only
problem is - it is sucking vacuum at idle. I rebuilt this carb
several years ago. Is it possible that I missed a gasket (or
something) causing it to suck manifold vacuum?


On 5/10/05, Walt Boeninger <(email redacted)> wrote:
> No, that is not correct. You don't want advance at idle.
> It should be connected to the carb, above the throttle
> plates, so it sees NO vacuum at idle. As soon as the throttle
> opens, it gets vacuum to advance the spark for acceleration
> until enough RPM is achieved to get into the centrifigal
> advance.
>
> Connecting to manifold vacuum means you're always advanced
> above static setting.....
>
> ...but in the big scheme of things it probably doesn't matter
> that much... just emissions......
>
> Walt
>
> Mike H wrote:
>
> > I have always had my (67 289 A code) vacuum advance connected to
> > manifold vacuum. Disconected and plugged when adjusting the innitial
> > timing (6 btdc). Then reconnect, which then advances the timing out
> > further during idle. Is that not the correct procedure???
> >
> > On 5/9/05, Steve Hawkins <(email redacted)> wrote:
> >
> >>That's normally where it should be hooked up. That way you shouldn't get
> >>any vacuum advance at idle. Aren't you located in Spring?
> >>
> >>
> >>
> >>
>
> _______________________________________________
> Classic-mustangs mailing list
> (email redacted)
> lists.twistedpair.ca/mailman/listinfo.cgi/classic-mustangs
>

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Mail From: ckelly (ckelly)

IIRC, most of the distributors were connected to manifold vacuum, which is why
there are no ports on the carb. They pick up the manifold vacuum off the T in
the rear, where other things attach. My 67 289 was like that. CA cars might
be different. Anyway, if that port does not tap off the venturi, it's not a
distributor vacuum port. You can double check it by hooking a vacuum gauge to
the port and reving the engine. At RPMs above idle, significant vacuum will
be present. No vacuum - it's not a proper connection. If it vents into the
air cleaner area and you DO see a little vacuum on the gauge, replace your air
filter.

The only gasket on a 2100 carb that would cause a vacuum leak would be the
base gasket. The main external gaskets are the base gasket, the top cover
gasket and the accel pump diaphram. There may also be a vacuum port in the
choke assy - been years since I looked at one.

On Mon, 16 May 2005 09:02:17 -0700, Mike H wrote
> I checked my advance again and found that the the vacuum line is
> connected to the only available port on the carb...on the back side
> right below the air cleaner seat (it's a 2V Autolite). The only
> problem is - it is sucking vacuum at idle. I rebuilt this carb
> several years ago. Is it possible that I missed a gasket (or
> something) causing it to suck manifold vacuum?
>

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Mail From: W427 (David)

The proper distributor vacuum port on an Autolite 2100 carburetor is on
the base, right (passenger) side, about halfway between the throttle
shaft and the front of the base. It is 3/16", same as the distributor
advance cannister nipple.

The nipple you found (on the back side right below the air cleaner seat)
is for the filtered choke hot air inlet that runs down to the exhaust
manifold - if your car was equipped with that.

The proper ported vacuum source should not show a vacuum at curb idle
unless your throttle blades are open too far for a variety of reasons.

Hope that helps,
David

Mike H wrote:
> I checked my advance again and found that the the vacuum line is
> connected to the only available port on the carb...on the back side
> right below the air cleaner seat (it's a 2V Autolite). The only
> problem is - it is sucking vacuum at idle. I rebuilt this carb
> several years ago. Is it possible that I missed a gasket (or
> something) causing it to suck manifold vacuum?
>
>
> On 5/10/05, Walt Boeninger <(email redacted)> wrote:
>
>>No, that is not correct. You don't want advance at idle.
>>It should be connected to the carb, above the throttle
>>plates, so it sees NO vacuum at idle. As soon as the throttle
>>opens, it gets vacuum to advance the spark for acceleration
>>until enough RPM is achieved to get into the centrifigal
>>advance.
>>
>>Connecting to manifold vacuum means you're always advanced
>>above static setting.....
>>
>>...but in the big scheme of things it probably doesn't matter
>>that much... just emissions......
>>
>>Walt
>>
>>Mike H wrote:
>>
>>
>>>I have always had my (67 289 A code) vacuum advance connected to
>>>manifold vacuum. Disconected and plugged when adjusting the innitial
>>>timing (6 btdc). Then reconnect, which then advances the timing out
>>>further during idle. Is that not the correct procedure???
>>>
>>>On 5/9/05, Steve Hawkins <(email redacted)> wrote:
>>>
>>>
>>>>That's normally where it should be hooked up. That way you shouldn't get
>>>>any vacuum advance at idle. Aren't you located in Spring?
>>>>
>>>>
>>>>
>>>>
>>
>>_______________________________________________
>>Classic-mustangs mailing list
>>(email redacted)
>>lists.twistedpair.ca/mailman/listinfo.cgi/classic-mustangs
>>
>
> _______________________________________________
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> lists.twistedpair.ca/mailman/listinfo.cgi/classic-mustangs
>