Not Ranked
I seem to remember that I used 25degrees each set of points with 33 degrees total. Don't block one set open as the dwell can't be set correctly unless there is spring pressure on the breaker cam like when it runs. Set one set of points so that they stay open ,keeping pressure on the cam. Set the other set to 25 degrees and then adjust the second set to the total of 33 degrees, which will be about 25 degrees separately. After a amount of time you will notice that only one set starts to burn, as the current across the set that breaks the dwell will have the arc.
Only on a 4 lobe rotor(such as a old Mallory) will each set and total be the same as each point is open longer than the other set is closed.
I have also used an Accel dual point that had the external wiring so you could disconnect one set while setting the dwell and then hook up the other to set the total. That worked nice but I wired up a switch so I could retard my timing by selecting either or both sets of contacts. This was way before all the ignition retards and such that are now available.
There was also a breaker cam in the 534 truck engine that only had 10degrees of advance making it possible to run more initial timing lead.
Can you believe that noone has used points for 30 years now?
Jerry
|