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-   -   Ignition Coil Recommendation/Help (http://forums.pelicanparts.com/showthread.php?t=858006)

mysocal911 03-30-2015 08:15 AM
Quote:
Originally Posted by Charles Freeborn (Post 8553447)
When using the Blaster Coil with the stock Bosch CDI you'll need to put a .08 ohm (included in the proper coil kit) in line. If you switch to a MSD unit the resistor can come out. I've got a MSD on the shelf just waiting for me to install when I've got the time to do a few other things "while I'm in there".
I'll snap a photo today and post.
-C
An added resistor is not necessary when using that coil for a Bosch CDI application.

wwest 03-30-2015 08:29 AM
Quote:
Originally Posted by Charles Freeborn (Post 8553447)
When using the Blaster Coil with the stock Bosch CDI you'll need to put a .08 ohm (included in the proper coil kit) in line. If you switch to a MSD unit the resistor can come out. I've got a MSD on the shelf just waiting for me to install when I've got the time to do a few other things "while I'm in there".
I'll snap a photo today and post.
-C
What would be the effect of a .08 ohm resistor on a >300 volt capacitor discharge Ignition pulse?

Doesn't seem to even make sense even with a standard Kettering ignition system, 0.8ohms would be a more typical ballast resistor.

Are you sure this isn't an inductor?

wwest 03-30-2015 08:36 AM
MSD installation guide.

0.8 ohm resistor and MUST used ONLY if you have a "points" type, Kettering, ignition system

http://www.msdignition.com/instructions/Products/8202_instructions.pdf

Charles Freeborn 03-30-2015 10:56 AM
Yes, sorry to not clarify, still running points in the car.
-C

wwest 03-30-2015 11:13 AM
Quote:
Originally Posted by Charles Freeborn (Post 8553876)
Yes, sorry to not clarify, still running points in the car.
-C
Running points with a CDI isn't really pertinent to the issue.

Running points to control the old style Kettering inductive coil charge system is.

In that case the ballast resistor is required to limit the 12 volt source current in the lower RPM Ranges such that it doesn't over heat the coil.

0.8 ohms plus coil primary resistance = ~15 amps.


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