DSII Install questions

[kuhlou]

got the new parts from AZ & checker, ready to go, with a question or two.

Plan is to replace the stock non-loado dizzy w/DSII & GM Hei module, carb is autolite 1100 w/scv valve (mismatch), to be replaced with HW 5200. New carb is on hand also.

I'm thinking the DSII install should happen first? then the carb install. I'll run vacuum from the manifold. I can plug off the carb vacuum port, do I also need to plug off the scv port?

Have read the many threads on the DSII install, and printed off the "how to", so armed with that info. Had not seen the above question asked yet.

Any other last minute advice? Tally Ho!

 

[l3n]

I think the consensus is that running a SCV carb without the LoM dizzy is a performance dog - basically, that system was designed to work with both halves, and neither component functions properly if split apart.

 

[Eric Rose]

I ran my DSII distributor with manifold vacuum and it did fine. The car had a "non-LoM" hooked up to the manifold when I got it so I just thought that was just how it's done

 

[JackFish]

Ford hooks them up to the spark port on the carb.

 

[mugsy]

Jack Fish is correct. The 1100 has one one external port for the LOM dizzy. There are internal passages that connect the venturi and manifold vacuum sources. The SCV "picks" which source and routes it to the external point.

I would think you could use manifold vacuum while the DS-II and LOM carb are one the car. Get the DS-II sorted out and then do the carb swap. You'll want to make one change at a time (yeah, I know, we can't wait to make all the changes), but it will help to troubleshoot if there are any problems. If you had both a new carb AND dizzy and the thing didn't run right you'd pull you hair out trying to find the fix.

 

[wallaka]

I think the consensus is that running a SCV carb without the LoM dizzy is a performance dog - basically, that system was designed to work with both halves, and neither component functions properly if split apart.

You got it backwards. The LoM needs the SCV, but the dizzy doesn't affect how the carb works at all.

 

[kuhlou]

thanks, I believe the comments reinforce the idea that the dizzy goes in first, run manifold vacuum to it. Does the scv valve port need to be plugged on the 1100 autolite, or leave it alone? I will only run the 1100 long enough to dial in the dizzy, then do the carb swap to the 5200 hw. After reading the posts on the pony carb trials, I wonder if I may be better off running Pony carbs "new" 1100 vs the hw 5200. Time will tell.

 

[Patrick66]

plug the hole with a 3/8" fine thread bolt.

 

[kuhlou]

got the 3/8" fine thread bolt, took out scv, looks to be a 1/2 or maybe 7/16! Suppose some were different. Then, going to check timing curve on present non load-o dizzy as suggested, and son no. 3 (also a stang man) has taken it with him to his present assignment, 100 miles from home. The boys are real motorheads, and are a great help to me, however... :roll:

 

[60s Refugee]

I would think that not plugging the hole in the 1100 would cause a vacuum leak.

A DSII wasn't designed to be compatable with the load o matic system.

I'm hooking my DSII advance to manifold vac, even though the middle carb is still an OEM autolite 1100. I'm either going to add a port to the carb base or split off a second line from the tranny modulator line fitting for the advance vac line.

Harry

 

[kuhlou]

had read that somewhere in these threads before, and when looking at the scv sticky. I agree, can't hurt to plug it, will probably help. I'll use manifold vac for the dsII.

 

[kuhlou]

spent yesterday trying to find a nut that would thread onto the scv valve thread at the local hardware store, 12mm w/very fine thread (can't remember exact pitch, but they had lots of choices), no go, 1/2" find thread no go. Store mgr is german car guy and thought it could be 13mm fine pitch. I bought a rubber stopper to plug the scv port. I believe vacuum would hold it in while running. Could add a little glue of some sort too, maybe.

Does this seem like a reasonable, temporary solution to plug the scv valve while dialing in the new DSII setup?

Will replace the 1100 with hw5200 as soon as new dizzy is working.

 

[grocery getter]

since it is temporary, that would work. i'd use a little silicone on it.

 

[kuhlou]

good suggestion, will do.