Dave

Hey guys..
Well I have a problem that for the life of me I can't
figure out..
I have a 71 Cleveland in my 77 Ranchero..running the
Ford dizzy and a Mallory ignition...
the car ran great for 2 years after I put this setup in
it..
right now my problem is advace, I set the
timing at 6deg BTDC, after starting up letting it
warm up for a bit, I check the timing with my light,
it like at 30deg at around 750 rmp and no vacuum
attached...I can adjust the dist and get the timing down
to around 10deg befor she wants to stall out..
Any ideas
another problem I found is that if I then attche the vacuum
and watch my timing marks, while giving it some gas
she retards instead of advacaing....
I know the dizzy is good, I'm using the coil out of a
newer Ford...one of the (HEI) ones...
hope I made myself clear...
Best

thekingofazle

when you nail it, vacuum should drop, (retarding timing) until you let off and the throttle blades close, then the vacuum should spike up as the engine is spinning faster and pumping more air=bigger vacuum against the throttle blades.

Vacuum advance is more for part throttle driving, for fuel economy, while your cruising at a constant relative vacuum (say on the highway when you're not really moving the throttle much.)

Also, I heard someone saying there was a vacuum advance/retard module for emissions during the 70's that could retard timing when vacuum is applied.

I'd check things like your float level and idle tune first, to make sure its not stalling out dur to excessive rich or lean conditions.

ponyexpress

If you have 30 degrees @ 750 RPM, I believe your problem is with the mechanical advance in the bottom of your dizzy. You may have a broken spring or way too much advance. I had a problem with my dizzy. Check out the post --Duraspark dizzy--update--(next page) to see what I did and get the info on your dizzy.

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347/c4 4.30 gear 11.07@119mph