Electronic Conversion Kit
The simple version is the combination of primary coil resistance and the ballast resistor will determine the current flow through the coil.
When the engine is at higher rpm, more current means faster the voltage and energy increaes on the secondary side. This is helpful because there is less time between sparks to reach voltage required and run a strong spark. At street speeds this is less an issue than racing rpms. This idea of a temperature adjustment was important enough that it was used by Chrysler and some other companies.
Resistance increases with temperature.
from 1969 Master Technicians Conference 259. p 5
1970 Points Ballast resistor checked at 70-80* F
1973
@67Dart273 or @KitCarlson can better discuss the effects of the coil saturation (energy build up in the secondary side) on the primary current flowing through.
With Chrysler's solid state igniution, the current through the coil also goes through the controlling leg of the ECU. A higher resistance ballast allows less current through and better protects that ECU circuit and as well as the coil.
The simple version is the combination of primary coil resistance and the ballast resistor will determine the current flow through the coil.
When the engine is at higher rpm, more current means faster the voltage and energy increaes on the secondary side. This is helpful because there is less time between sparks to reach voltage required and run a strong spark. At street speeds this is less an issue than racing rpms. This idea of a temperature adjustment was important enough that it was used by Chrysler and some other companies.
Resistance increases with temperature.
from 1969 Master Technicians Conference 259. p 5
1970 Points Ballast resistor checked at 70-80* F
1973
@67Dart273 or @KitCarlson can better discuss the effects of the coil saturation (energy build up in the secondary side) on the primary current flowing through.
With Chrysler's solid state igniution, the current through the coil also goes through the controlling leg of the ECU. A higher resistance ballast allows less current through and better protects that ECU circuit and as well as the coil.