Coil Tests

[joe_db]

This is the improved Crane Cams (Indigo) unit if you swing that way.

http://www.summitracing.com/parts/crn-3000-0231

[Don Moyer]

Ignitor II

Joe, we were informed by Pertronix quite a few years ago that they continued to recommend the standard Ignitor for the Atomic 4 fleet mostly because the improvements on their Ignitor II didn't manifest until engine speed exceeded 2000 RPM. Don

[joe_db]

The improvements of a stronger spark at high RPMS is not the issue. The LOWER dwell angle at LOW RPMs is what we need. Also nice that it turns itself off if you leave the ignition on. Trying to send business your way

Joe, we were informed by Pertronix quite a few years ago that they continued to recommend the standard Ignitor for the Atomic 4 fleet mostly because the improvements on their Ignitor II didn't manifest until engine speed exceeded 2000 RPM. Don

[Don Moyer]

Ignitor IIs

Thanks Joe, I'll review the case with Pertronix again. It's entirely possibly that I missed something in the past. Don

[hanleyclifford]

The improvements of a stronger spark at high RPMS is not the issue. The LOWER dwell angle at LOW RPMs is what we need. Also nice that it turns itself off if you leave the ignition on. Trying to send business your way

Certainly the standard Igniter does get the job done, as Don implied, and I would only add - so long as sufficient resistance is put in front of the coil. Still, the low rpm reduced dwell of the Igniter ii could permit a lower value resister provided the lower amperage at higher rpm sufficiently compensates for the increased dwell. This question is not as much a simple "one size fits all" matter as some might think. But there is no denying that the unit sold thru the on line catalogue gets the job done for the Atomic 4.

[joe_db]

The model II version does not need a resistor and I think the manual states it will not work with a ballast resistor. It has some kind of internal current control to work with standard or low resistance coils.

Certainly the standard Igniter does get the job done, as Don implied, and I would only add - so long as sufficient resistance is put in front of the coil. Still, the low rpm reduced dwell of the Igniter ii could permit a lower value resister provided the lower amperage at higher rpm sufficiently compensates for the increased dwell. This question is not as much a simple "one size fits all" matter as some might think. But there is no denying that the unit sold thru the on line catalogue gets the job done for the Atomic 4.

[hanleyclifford]

The model II version does not need a resistor and I think the manual states it will not work with a ballast resistor. It has some kind of internal current control to work with standard or low resistance coils.

I would have to have that demonstrated to me considering the great diversity of alternator and other system voltages.

[joe_db]

http://pertronix.com/docs/instruction-sheets/91146A.pdf

I just looked and the manual shows a way to power the ignitor from 12 volts while still using a ballast resistor for the coil. Turns out you can keep it if you want to.

I would have to have that demonstrated to me considering the great diversity of alternator and other system voltages.

[hanleyclifford]

http://pertronix.com/docs/instruction-sheets/91146A.pdf
I just looked and the manual shows a way to power the ignitor from 12 volts while still using a ballast resistor for the coil. Turns out you can keep it if you want to.

Both Figure 1 and 2 indicate "12 volts from ignition switch". That is as clear as mud and underscores why this discussion rages on. Who sends "12 volts" thru a 12 volt system?