Duraspark, which one??????

[66Sprint6]

I am going today, in a few hours to get my duraspark 2 from Autozone, but which one do I get. I asked for one form a 78 fairmont, but which one do I want, Single or dual vacume????? I really need to know soon guys!!!
Matt

 

[simon]

You just need one port on your vacuum advance canister.

On the other hand, two ports won´t hurt - you can use a dual vac advance canister as well. Just plug the retard port... or leave it unplugged, I cannot rmember if that actually hinders free movement of the vacuum membrane inside.

If anything fails, and if its cheap, get that dizzy and replace the dual vac can with a single vac can from any auto parts store.

my mind is pretty fuzzy, but I believe that the dual vacuum advance canisters serve a purpose as an emissions control only, and I found dual vac dizzies on manual tranny applications only, never on automatic transmission cars.
When lifting your foot quickly from the loud pedal, the retard side of the canister (the second nipple coming from the cnaister, mostly in some 90-degree-fashion) works against the advance, thus supporting decelleration.
basically.

hope that doesn´t confuse that much...

 

[66Sprint6]

lol, nah, thats awesome, I didnt know which one to go with, now I do. Thanx Simon
Matt

 

[CobraSix]

Go single Vacuum advance...much better then dual. Dual was emissions and is hard to tune up sometimes.

Slade

 

[66Sprint6]

Alrighty, I got on Mustang Geezer's site and wrote down all I needed to do this swap, I ended up NOT being able to get the cap adapter, so I will do that today, plus the distributor had to be ordered from a sister store and will be in today sometime. I really appreciate the help.
Matt