ok , so the "loop" spring would be the primary spring ? Here we Go ..............found this article .. GOOD INFO ! The springs adjust the advance rate. Where the distributor is bolted down determines the initial advance, the amount of travel in the mechanical advance determines the total advance, and the springs determine what RPM total advanced is reached. Lighter springs allow the mechanical advance to move more easily so you will reach total advance at a lower RPM. Stiffer spring will delay the total advance. Most distributors use two springs, a small one and big one. The big one will usually have a bit of lash so the small one does all the work at low speeds. This allows the advance to come up quickly off idle. Once the lash on the big spring is used up the weights will be trying to pull both springs so the advance rate will slow down. The chart below shows a typical stock advance "curve". It is the dual springs that give it the curve. If there were only one spring the chart would just be a straight line.
I would call it the secondary spring, the light spring allows a quicker advance curve, then the heavy spring slows it down. P5153446 Is the number for the Mopar kit and instructions.
ok Thanks on the kit . now .... my 1954 dodge royal 241 hemi has dist with fairly light oem springs .. would the red one be the primary spring ? but they both look identicle.
On your dizzy. The outer tabs that the springs are attached can be bent, this allows fine adjustment. It is easier done on a distributor tester than a engine. If it were me I would stick with the looped spring not two of the same. Make sure that there is not too much up/down movement in the main shaft. You might have to shim the collar that has the roll pin thru it. .003-.005" any more will allow the timing to be jumpy. I have a Allen Syncrograph that I mess with mopar distributors on. Pm me if I can be any help.
oh really ! I never heard anyone say that about my dizzie . what do you do... just bend the arm inward or outward?
The Jalopy Journal
