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| | | Supreme Being
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| | First want to thank you guys for the explanations on venturi vac and manifold vac. VERY VERY helpful. After my MSD cooked I installed my old dist. ( 57). Has pertonix kit. Need to change advance. To update you I have put in the 2500 stall convertor, sure help, along with adding a couple thousands on the valve adjust. Now idles. Timed to 14 int. put on vac line jumps to 55 deg. Have an adjustable vac can. Think I need to bring that down some?? Much more power, but afraid of the 55deg. Does not ping. Hope you all can understand what I trying to say, little merrgie. Need advice on advance springs and whatever you guys think will help.. Thanks in advance. God Bless
EddieLake Forest, Ca. 92630 |
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| | | Supreme Being
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| | Hi; A little info please. After you add vacume at idle what is the advance? If it does not ping then it does not have too much advance. Even 55 degrees will be OK provided it is not pinging. Other opinions please. Pete |
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| | | Supreme Being
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| | Eddie - As it sits - what is the maximum mechanical advance with the vacuum line disconnected and plugged? At what crank speed does it stop advancing? No load vacuum advance can be really large without too much worry - but I'd think 45° maximum might be more the norm. Makes me think the mechanical limits now in the distributor are a bit high for 14° initial. The internal advance limit may need to be "stopped" to control the upper end of the mechanical curve.
Steve Metzger Tucson, Arizona
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| | | Supreme Being
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| Good Mornin' Thanks Pete and Steve!! Will check total advance this morning(after everyone wakes up-- littlle noisey). Did notice on lite throttle seems to have slight flutter-miss, could this be too much advance, also do you guys remember which to turn the hex screw to adjust the vac can?? Lookin forward to hearing from you!! Many thanks God Bless
EddieLake Forest, Ca. 92630 |
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| | | Supreme Being
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| | Eddie - The set screw inside the vac can is turning in a regular RH thread "nut". With the screw fixed to the diaphragm and the nut "free" to travel in the hex housing - turning the screw counter-clockwise compresses the spring - and limits diaphragm travel. Turning the screw clockwise backs it away toward the nipple freeing the spring and increasing travel. The "new" one I just put on my outfit is a "Standard" part and it takes a 7/32 hex wrench. 
The instruction sheet suggests that you gently turn the screw (clockwise) until the nut has "stopped" at the full out position (it gets snug) - then count turns counter clockwise as you compress the spring. There isn't any calibration chart - I've just been driving it - and turning it a half turn and driving it.....and so on to creep up on the maximum the thing will tolerate. If its old and crusty inside - squirt some WD40 down the nipple port and try to free up the screw.
Steve Metzger Tucson, Arizona
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| | | Supreme Being
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| Hey Guys;; Adjusted vac can, now 45deg. Looks like total is about 40-42, still no ping!! Got a cruise tomorow so will see how it goes!!! Next week will pull dist. plate and try to limit advance, don't quite know how to do that but somewhere someone was telling me about brazing the slots. Will try to find the article on the net. Again MANY THANKS--- that's what's sooo nice about this site- everyone is willing to help and share!!! God Bless
EddieLake Forest, Ca. 92630 |
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| | | Supreme Being
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| Eddie, An hour or two at your local junkyard and you can net a couple different advance plates. They all have two slots which are numbered. For example, one slot may be numbered 18 and the other 13. These numbers correspond to distributor degrees. Double it for crank degrees. I'll bet yours is in an 18 slot and flipping it around will probably get a more favorable maximum advance. This is muche easier than welding or brazing.
Norcross, GA |
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| | | Supreme Being
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| WOW-- Charlie,, Where do you guys get all of this info.. Amazing and really fantastic for all of us. MANY THANKS and God Bless
EddieLake Forest, Ca. 92630 |
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| | | Supreme Being
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