DS II

[ski4evr]

I went to Autozone and asked for a '78 Fairmont distributor and single and dual vacuum popped up for the two options...

I want to upgrade to DS II for the electronic points vice my current loadomatic mechanical points...

I'm assuming that the single vacuum advance is the one I want and not the dual vacuum (which is for the smog emmissions stuff - based on previous postings) - is this right?

Also, I have and Autolight 1100 so the vacuum advance on my current distributor is connected to the carb. If I get the '78 single vacuum distributor, where do I connect the new distributor vacuum (manifold or carb)?

From reading previous posts, the loadomatic distributor runs off of a lower vacuum vice later model ditributors - so the loadomatics connect to the carb and the later vacuum advance distributors connect to the manifolds...right?

I changed the distributor on my car (65 Mustang / 200 cid) a long time ago and I'm not sure if I even have the right distributor. Could I have a later vac + mech distributor? If so, does that mean that I should have the vac port connected to the manifold now? How can I tell?

 

[CobraSix]

To determine what year dizzyy you have, look on the side of it, there should be a part number that starts with aletter, then a number. It goes like the C8 means 68, D7, is 77, etc.

As far as the DS2, I would go single vacuum advance. Actually, I did. As far as where to hook it up, I hooked mine up to the carb ported vacuum source. I didn't want vacuum advance to come into play at idle. I may be wrong on that one though>

Slade

 

[ski4evr]

I just looked under my dizzy cap and it appears as if it is a dual advance distributor:

I can not see any springs (so they must be within the vac/diaphragm section)

- and -

The rotor does turn about 10 to 15 degrees clockwise - then springs back).

There are #'s on the side (D150F).

I have the dizzy vacuum port connected to the autolite 1100 near the top of the carb. I suck on the line and I can see the plate below the rotor move - so it is not clogged and there are no leaks...good.

Question - is the vac line connected to the correct location for a dual advance dizzy? I thought the loadomatics worked at a lower vacuum and were controlled by a spark control valve on the autolite 1100's. So, if my dizzy is not a loadomatic, should my vac line be connected to the manifold?

My autolite 1100 carb, by the way, is casted with the spark control valve location blocked off - is this normal?

 

[kirkallen143]

No, you are right, keep your vacuum line hooked up to the port-side vacuum of the carb. Like they say, you do not want vacuum at idle. If you are not sure, test the vacuum port with your finger on it and rev the rpms up, you should feal the suction. That is the one you want.

Kirk ' 73 bronco

 

[ski4evr]

Thanks kirkallen143...

I'll check for vacuum at the carb


When would the dizzy vacuum port be connected to the manifold? Anyone?