Model engine CDI Autoadvance

[ScaleRobotics]

That is funny!

For the 0 to 1300 rpm at 5 degrees, and 4000 at 28 degrees, with the slope in between, we can calculate it as (85 * RPM)/1000 - 60, with the answer as xxx where it is really xx.x degrees.
For example (85 * 4000)/1000 - 60 = 280 , or 28.0 degrees. (85 * 1300)/1000 - 60 = 50 , or 5.0 degrees. This will give a little more precision, and makes the math easier.

For your dwell, you could use 4000/RPM * 32 to get pretty close dwell number. Of course switching it the right way for div32