Archer

Question for you older guys ...

Remember the big yellow Accel Super coil? Yes, they are still making it.

Back in the day, you had to use and additional 1/4 ohm resistor in line with the factory dual resistor, but placed just before the coil.

Been running mine that way for 30+ years. After talking with an electrical guy and calling Accel, apparently the auxiliary resistor isn't needed with the Mopar duel resistor.

OK, it's only 1/4 ohm, is this thing necessary or not? Opinions and reasons, as it what kind of damage could I do if I removed it? (Assuming it would fry the coil sooner or later???)

BTW - please don't tell me to get rid of it and get a "better" coil, I like the way it looks and it has been working.

Thanks,

Archer

440roadrunner

The dual resistor has nothing to do with whether you need the Accel additional resistor. I would go by the destructions Accel published, NOT go by what someone told you even though they are an employee.

The dual resistor works as so:

One of the resistors supplies the coil in exactly the same way all coil resistors do

The other resistor supplies voltage to the ECU box, and really has nothing to do with the coil. This was eliminated in later so called "4 pin" ECU boxes which were redesigned.

Archer

440 -

I have a 4 pin ECU (Chrome box).

Accel published instructions say to use it in line.
Just got me a little edgy when their tech support said not to???

Thanks,

Archer

bremereric

Why question what has worked for you in the past.

440roadrunner

I've been witness to a couple of coils that were and did explode, one of which was the big old rectangular Mallory. I'd personally, stick with published destructions.

Remember, the Mopar ECU is basically just replacing the points. It does not change the dynamics of the circuit. The Mopar coils and resistors were similar for years and years, so THAT didn't change "much."

GM HEI modules DO modulate coil current, and MSD, and other CD ignitions do not run DC current through the coil, so THEY are a different case.

Archer

Eric -

Reason I'm asking, is because I don't know!
I don't like using stuff, if it's not necessary.

Right now, I'm not removing it, but may "hide" it under the coil (instead of over it), to neaten up the engine bay. See below.

The base question was will 1/4 ohm make any real difference?



Little things make me happy...

Archer

MrOldart2U

I too am a "fan" of the big ole yellow coil, and I dont know if there is a 'better' one, sense they do still make it as you have stated. I would just "hide" the extra resistor and leave it be...

As far as knowing why I cant answer that, but I have one on me old ferd wired the same. Resistor wire and a 1/4 ohm resistor...

Gorts 5th

if it works don't fix it 30 + years
ive had a coil explode on me the msd blaster coil....lol but that was my fault i left the ignition on in the run position after doing some work on her
some friends showed up and i got distracted left the ignition on for at least 3 hrs while sitting in the living room i heard it go off.............. bang

440roadrunner

1/4 ohm in a 12V circuit makes a BIG difference, percentage wise. If Accel didn't think you needed it, they certainly would not have gone to all the trouble to provide it.

According to the 72 shop manual, the coil resistance of a factory coil, depending on who made it, varies from 1.4 to 1.8 ohms

The factory resistor is .5--.6 ohm, so you can see that we are dealing with very low resistance here