OK, that makes sense now. Thanks for the clarification - not the relationship between the advance types. Thank you very much!Let’s restart. You want total timing to be 36 BTDC. Total timing does not include vacuum timing. Total timing is not tied to any RPM’s.
It is the total amount that your timing can advance at WOT. When no vacuum is present. Total timing is a combination of base timing, set with your hand and timing light, and the centrifugal timing advance by the weights. Springs don’t matter here.
it is how far the weights will advance, and then stop by hitting their hard metal stop.
base timing and centrifugal timing must be matched to achieve 36 degrees. So if your centrifugal total is 24 degrees you set base timing at 12 degrees =36. If centrifugal 26 set base at 10 = 36.
Now vacuum timing, Vacumn timing is a great benefit to make your car run cooler smoother and better accelerate. It adds the necessary advance above total timing, 10 degrees is perfect, for all that benefit.
the reason you need it is at idle and cruise the mixture is leaner and needs spark much earlier to get a complete burn.
use the vac can I told you hooked to full manifold vac.
Now the springs and how everyone talks this advance shorthand wrong. ”I got 36 degrees at 2500 RPM” they say. So I am good. If that is your total timing you are good, but if your timing advances beyond that to 49 degrees at 4000 Rpm.. you are not good.... as you are not reading total timing just springs at various times.
once your total timing is established, then you can adjust when it comes in at what RPM with springs. You want to bring it all in near 3000 or so 32 3400 even for good running.....
springs are meaningless until all other parameters established.
Base Timing is set by hand and locked down. Centrifugal timing is Weights and springs and Operates on RPM’s only.
Vacumn timing is tied to your gas pedal...light load, more timing, pedal down WOT no Vacumn timing.
you will get it, think about the 3 methods of timing at play...base, Centrifigal and Vacumn.
sync em all up and it will run great!
Weights will be here Saturday, vacuum can Sunday and vacuum tubing tomorrow. Found another leak today!! I'm replacing every vacuum line I can.
I will let you know how it goes.
Thanks again! Dan