Need Opinions. Have nothing to compare to.
This happens to be the vacuum advance from a mid to late 80s Mopar Performance distributor. The initial spring force is adjustable using an allen key. Plotted here are pretty close to the extremes of adjustment available. (Ignore 'Target'. That was specific to the situation.)
The second graph is a rebuilt Chrysler distributor (original application unknown).
A wrap of .031" diameter wire on this vacuum advance's arm limited the number of degrees that can be added. A slight adjustment was also made to the spring's preload.
This happens to be the vacuum advance from a mid to late 80s Mopar Performance distributor. The initial spring force is adjustable using an allen key. Plotted here are pretty close to the extremes of adjustment available. (Ignore 'Target'. That was specific to the situation.)
The second graph is a rebuilt Chrysler distributor (original application unknown).
A wrap of .031" diameter wire on this vacuum advance's arm limited the number of degrees that can be added. A slight adjustment was also made to the spring's preload.