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Huh???
Which reluctor arm did you use? I will assume you used L13. This is covered in my site.
Because the distributor is half the crank, 13 X 2 = 26 degrees. Now, you just added 12 degrees of initial timing, so 12 + 26 = 38 degrees!
Isn't that what we were shooting for all along? Where are all your pictures? I'd rather see what's going on, to better explain it to you.
Now that you are done with 'all in' timing, the only adjustment you need is, 'how soon does it get there'. That's what the springs do.
Vacuum advance is another story. It only comes in when your foot is light on the gas pedal, NOT when you take off at a light, not when you pass a truck, climb mountains, etc. Think about it. when your foot opens the carb, vacuum drops and so does the vacuum advance. When you're 'at speed' you get the most vacuum. So, now we have the centrifugal weights sensing engine speed AND a vacuum advance sensing acceleration.
We talked about starting. How much vacuum does your engine have then? NONE. At the same time, the weights are retracted, and that's good because we don't need pistons fighting the starter motor with too much advance. As soon as it starts, you get full vacuum and vacuum advance. As the engine speed slowly increases, the weights further advance the reluctor arm and rotor. At wide open throttle, the vacuum advance backs off. - Dave
Which reluctor arm did you use? I will assume you used L13. This is covered in my site.
Because the distributor is half the crank, 13 X 2 = 26 degrees. Now, you just added 12 degrees of initial timing, so 12 + 26 = 38 degrees!
Isn't that what we were shooting for all along? Where are all your pictures? I'd rather see what's going on, to better explain it to you.
Now that you are done with 'all in' timing, the only adjustment you need is, 'how soon does it get there'. That's what the springs do.
Vacuum advance is another story. It only comes in when your foot is light on the gas pedal, NOT when you take off at a light, not when you pass a truck, climb mountains, etc. Think about it. when your foot opens the carb, vacuum drops and so does the vacuum advance. When you're 'at speed' you get the most vacuum. So, now we have the centrifugal weights sensing engine speed AND a vacuum advance sensing acceleration.
We talked about starting. How much vacuum does your engine have then? NONE. At the same time, the weights are retracted, and that's good because we don't need pistons fighting the starter motor with too much advance. As soon as it starts, you get full vacuum and vacuum advance. As the engine speed slowly increases, the weights further advance the reluctor arm and rotor. At wide open throttle, the vacuum advance backs off. - Dave
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