Tach wave

[JZM]

Thanks for the info ZMan... I was wondering about the ballast resistor, did I still need it or could I remove it, or jumper it.. From the reading I've done the ballast resistor is needed if I was still running points... But since I'm not it looks like I can jumper it, or remove it....

Before you remove the ballast.make sure that the pertronix can handle battery voltage, unlike the mallory unilite unit which can only take about 8-9 volts max.

JZM..

[=Enigma=]

As best as I can figure the wiring of the unit with the tach adaptor installed it should be wired like this...

Jason has a diagram of this setup here:

http://www.geocities.com/jasonparuta/ignition.html

[peng155]

Well Guy's...

I had a look at the install instructions for the Pertronix unit... The diagram shows the red wire from the Pertronix unit connected at the same point as the Ignition Sw, on the same side of the ballast resistor, so it looks like the pertronix unit is getting the full 12V.

The instructions says that it's fully compatiable with a point style coil.. I understand the theory of a coil... and with some differences in materials, and design between manufactures.. I always thought coils for a point system were the same... No???

[peng155]

Jason has a diagram of this setup here:

http://www.geocities.com/jasonparuta/ignition.html

Enigma.... Thank you very much!!!! Just what I was looking for

[240ZMan]

I suspect they are describing coils that have a higher resistance as "point style". Points can't handle as much current from low coil resistance as electronic ignitions can.

I think the issue you need to resolve is if the pertronix can handle the low resistance of the blaster coil. They may suggest you put the ballast resistor in series with the coil. If that's the case, I'd suggest you either use pertronix' coil, or do the switch to the MSD 6AL/Blaster. I had this exact conversation with them 3 years ago when I made the switch. The resistor limits the current through the coil (to protect the pertronix) but also limits the voltage of the coil. So going with a "hotter" coil doesn't really buy you anything. That's why I went with the flamethrower. It was the best comprimise for me.

Still, it's been 3 years since I spoke with them, and my memory may not be complete :stupid: You'll probably have to talk to them to be sure.

[peng155]

Thanks for the info ZMan... I think you're right I give MSD tech support a call on Monday and see what they suggest and let you all know what they say.. I have a few questions on which Tach adaptor I'll need to use...

The one I was planning on using was PN 8920, but in the drawing that Enigma posted from Jason he used PN 8910.. So I'll need to see what the difference is.. From what I could tell adaptor 8920 looks like it can be used for either Voltage Trigger, or Current Trigger type Tach's