Junker turned daily driver.

[Giovanni89]

I suspect it runs best at 5 degrees because the vacuum is over advancing it. The arm on the one that did not work was stamped 11.5 I measured the travel at 5mm, so i'm not sure what the 11.5 means. Maybe corresponds to a vacuum level to make it actuate? I may pull my distributor tomorrow to replace the distributor drive gear on the cam. I have been meaning to put it in for a little while now. If I do I'll pop off the vacuum unit and see what the numbers are that are stamped on the one that works well.

[geezer101]

I suspect it runs best at 5 degrees because the vacuum is over advancing it. The arm on the one that did not work was stamped 11.5 I measured the travel at 5mm, so i'm not sure what the 11.5 means. Maybe corresponds to a vacuum level to make it actuate? I may pull my distributor tomorrow to replace the distributor drive gear on the cam. I have been meaning to put it in for a little while now. If I do I'll pop off the vacuum unit and see what the numbers are that are stamped on the one that works well.

Is it the counterweights' actual weight in grams?

[Giovanni89]

vacuum advance.jpgvacuum advance bad.jpg
Not the best shots, but you can see the numbers stamped on the arm. When I installed my new distributor it ran like crap. Check to see if you have any numbers stamped on yours. 11.5 was no good. 10 runs great. Luckily I had the new advance unit sitting on the shelf. I had planned on overhauling the original dizzy, but I had a ton of wear in the mechanical advance that was more trouble than the cost of a new one.