MSD Pertronix buick v6

Hey Guys,

Got a quick question,

I installed a pertronix for the buick a while back and installing a MSD now I am using the stock coil for now.

my question is do I put the red wire (from MSD) that goes to the ignition before or after the Ballast resister? (I have stock coil)

I put the white wire of msd to the black wire on the pertronix

Basically followed this
http://www.pertronix.com/support/tips/pdf/msd6series.pdf

for future reference is it better to run the MSD coil or the pertronix coil? any opinions


Thanks guys

 

That's a good question. I would think after the ballast because the ballast drops the volts before reaching the points so the points don't burn up. You no longer have the points so I don't see why you would need to drop voltage anymore, but I really don't know the answer. The instructions don't specify whether a ballast is used or not?

 

The diagram clearly shows the red wires going to 12V. Does your original coil have the built in resistor or not?

 

I actually don't know if it is external or internal

I go to the website of o'reillys store I bought the coil and it just says 12v doesn't say if it's external or internal. just says it fits my application


I will search how to check the coil, and try and find out







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I did some research, that ballast is more for the points than the coil.

a buick site I was on they where saying its fine if coil gets full voltage it just runs hotter. 165F something like that which is fine.
found someother website that says same thing.


Jeep starts now, it runs really smooth and fires up really easy. I like it with MSD, as for the stock coil.
I am planning on switching coils in near future and if running 12 volts shortens life of the stock coil i'm okay with it.

I am however going to assume my starter is okay to get 12 volts instead of the 9 after the ballast? any objections
the ignition wire is just a trigger for starter (like a relay) from my understanding.

 

Piff,
I sent a note to Petronix. Use their coil with their electrics. No ballast needed. Needs to match ohms, I have one on the workbench, don't remember if it's the 1.5ohm, or 2.5 version. Not sure what the msd adds to the mix.

Not sure about the starter, I'm thinking it would be fine.

D


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That wire from the starter solenoid (R terminal) to the coil + is the ignition bypass and is required to supply 12V to the coil when the ignition switch is in the start position. Some ignition switches have no power to the (I=ign) terminal during the start/crank position. Coils with internal resistor will be labeled (internal resistor) or (for use with external resistor only). If nothing is labled then it is normally taken to be used with external resistor. Coil resistance is measured with OHM meter connected across the neg to pos terminals of the coil and with no wires connected. The value for the 225V 6 pertronix application should be a minimum of 3 OHM's.

 

Thanks Walt, I guess I will put the meter on it and then I shall see if I really should put the resistor on it.


Dane, thats good to know. I recall pertronix said stock coil is fine so does MSD but together its a question also with the ballast thing.

I will measure the coil, I should put the resistor in if it does need it. It does run really good without it with the ignition combo, its so smooth and quiet now too. I look forward to seeing what a good coil does when I get around to it, but for now stock coil will do.

 

Thanks Walt. Looks like three on the box on my workbench! I know I sent one back because it was too low.


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Here it is, found it...

--------

You would need Flame-Thrower coil part number: 40511. You will remove the
resister.


Marvin Grebow Jr
PerTronix Inc.
Technical Department

 

I was curious,

I called them up and sent an email to find out what the MSD adds to the mix. they said use part 45011, but when I called I had the guy explain it to me.

he says as long as the ignitor is not hooked directly up to the coil, use what ever coil. The 45011 is a .06 ohm coil and you don't need a ballast on it when running the MSD boxes apparently.

 

Pertronix and MSD design their coils for several different reasons. One of them is high heat handling ability. The point system coil if reading 3 ohms resistance would pull 4 amps at 12V and if 1.5 ohms resistance it would pull 8 amps at 12V. Amps or Current means heat. So your original coil if it's resistance is 1.5 ohms would get quite hot unless you increased the primary resistance. Kaiser jeep even gives you the required resistance for the ballast resistor.

 

The MSD box eliminates the need for a ballast resistor.
My ignition is a full Mallory system (HyFire CDI box, distributor and coil) which has a bypass plug built into the wiring harness. I kept my ballast resistor in circuit just in case the CDI box ever failed so that I can use the bypass plug without worrying about damaging the electronic module in my distributor.
Otherwise you don’t need one anymore.